/* -*- c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
  Copyright(C) 2010 Tetsuro IKEDA
  Copyright(C) 2010-2013 Kentoku SHIBA
  Copyright(C) 2011-2017 Kouhei Sutou <kou@clear-code.com>
  Copyright(C) 2013 Kenji Maruyama <mmmaru777@gmail.com>

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
*/

#include "mrn.hpp"
#include "mrn_mysql.h"
#include "mrn_mysql_compat.h"

#include <sql_plugin.h>
#include <sql_show.h>
#include <key.h>
#include <tztime.h>
#include <sql_base.h>
#include <sql_select.h>
#include <item_sum.h>

#ifdef MRN_HAVE_BINLOG_H
#  include <binlog.h>
#endif

#ifdef MRN_HAVE_SQL_OPTIMIZER_H
#  include <sql_optimizer.h>
#endif

#include <ft_global.h>
#include <spatial.h>
#include <mysql.h>
#include <sys/types.h>
#include <sys/stat.h>

#ifdef WIN32
#  include <math.h>
#  include <direct.h>
#  define MRN_TABLE_SHARE_LOCK_SHARE_PROC "?key_TABLE_SHARE_LOCK_share@@3IA"
#  define MRN_TABLE_SHARE_LOCK_HA_DATA_PROC "?key_TABLE_SHARE_LOCK_ha_data@@3IA"
#  ifdef _WIN64
#    define MRN_BINLOG_FILTER_PROC "?binlog_filter@@3PEAVRpl_filter@@EA"
#    define MRN_MY_TZ_UTC_PROC "?my_tz_UTC@@3PEAVTime_zone@@EA"
#  else
#    define MRN_BINLOG_FILTER_PROC "?binlog_filter@@3PAVRpl_filter@@A"
#    define MRN_MY_TZ_UTC_PROC "?my_tz_UTC@@3PAVTime_zone@@A"
#  endif
#else
#  include <dirent.h>
#  include <unistd.h>
#endif

#include "mrn_err.h"
#include "mrn_table.hpp"
#include <groonga/plugin.h>
#include "ha_mroonga.hpp"
#include <mrn_path_mapper.hpp>
#include <mrn_index_table_name.hpp>
#include <mrn_index_column_name.hpp>
#include <mrn_debug_column_access.hpp>
#include <mrn_auto_increment_value_lock.hpp>
#include <mrn_external_lock.hpp>
#include <mrn_match_escalation_threshold_scope.hpp>
#include <mrn_multiple_column_key_codec.hpp>
#include <mrn_field_normalizer.hpp>
#include <mrn_encoding.hpp>
#include <mrn_parameters_parser.hpp>
#include <mrn_lock.hpp>
#include <mrn_condition_converter.hpp>
#include <mrn_time_converter.hpp>
#include <mrn_smart_grn_obj.hpp>
#include <mrn_database_manager.hpp>
#include <mrn_context_pool.hpp>
#include <mrn_grn.hpp>
#include <mrn_value_decoder.hpp>
#include <mrn_database_repairer.hpp>
#include <mrn_operation.hpp>
#include <mrn_column_name.hpp>
#include <mrn_count_skip_checker.hpp>
#include <mrn_variables.hpp>
#include <mrn_query_parser.hpp>
#include <mrn_smart_bitmap.hpp>
#include <mrn_table_fields_offset_mover.hpp>

#ifdef MRN_SUPPORT_FOREIGN_KEYS
#  include <sql_table.h>
#endif

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
#  include <create_options.h>
#endif

// for debug
#define MRN_CLASS_NAME "ha_mroonga"

#define MRN_SHORT_TEXT_SIZE (1 << 12) //  4Kbytes
#define MRN_TEXT_SIZE       (1 << 16) // 64Kbytes
#define MRN_LONG_TEXT_SIZE  (1 << 31) //  2Gbytes

#ifdef MRN_HAVE_TDC_LOCK_TABLE_SHARE
#  ifdef MRN_TABLE_SHARE_TDC_IS_POINTER
#    define mrn_open_mutex(share) &((share)->tdc->LOCK_table_share)
#  else
#    define mrn_open_mutex(share) &((share)->tdc.LOCK_table_share)
#  endif
#  define mrn_open_mutex_lock(share) do {               \
  TABLE_SHARE *share_ = share;                          \
  if (share_ && share_->tmp_table == NO_TMP_TABLE) {    \
    mysql_mutex_lock(mrn_open_mutex(share_));           \
  }                                                     \
} while (0)
#  define mrn_open_mutex_unlock(share) do {             \
  TABLE_SHARE *share_ = share;                          \
  if (share_ && share_->tmp_table == NO_TMP_TABLE) {    \
    mysql_mutex_unlock(mrn_open_mutex(share_));         \
  }                                                     \
} while (0)
#else
#  ifdef DBUG_OFF
#    ifndef _WIN32
extern mysql_mutex_t LOCK_open;
#    endif
#  endif
static mysql_mutex_t *mrn_LOCK_open;
#  define mrn_open_mutex_lock(share) mysql_mutex_lock(mrn_LOCK_open)
#  define mrn_open_mutex_unlock(share) mysql_mutex_unlock(mrn_LOCK_open)
#endif

#if MYSQL_VERSION_ID >= 50600
#  define MRN_NEED_M_LOCK_TYPE_CHECK_FOR_WRAPPER_EXTERNAL_LOCK
#endif

#ifdef MRN_MARIADB_P
#  if MYSQL_VERSION_ID >= 100200
#    define MRN_ORDER_IS_ASC(order) ((order)->direction == ORDER::ORDER_ASC)
#  else
#    define MRN_ORDER_IS_ASC(order) ((order)->asc)
#  endif
#else
#  if MYSQL_VERSION_ID >= 50603
#    define MRN_ORDER_IS_ASC(order) ((order)->direction == ORDER::ORDER_ASC)
#  else
#    define MRN_ORDER_IS_ASC(order) ((order)->asc)
#  endif
#endif

#define MRN_STRINGIFY(macro_or_string)  MRN_STRINGIFY_ARG(macro_or_string)
#define MRN_STRINGIFY_ARG(contents)     #contents

#define MRN_PLUGIN_NAME mroonga
#define MRN_PLUGIN_NAME_STRING "Mroonga"
#define MRN_STATUS_VARIABLE_NAME_PREFIX_STRING "Mroonga"

#ifdef MRN_MARIADB_P
#  define st_mysql_plugin           st_maria_plugin
#  define mrn_declare_plugin(NAME)  maria_declare_plugin(NAME)
#  define mrn_declare_plugin_end    maria_declare_plugin_end
#  define MRN_PLUGIN_LAST_VALUES    MRN_VERSION, MariaDB_PLUGIN_MATURITY_STABLE
#else
#  define mrn_declare_plugin(NAME)  mysql_declare_plugin(NAME)
#  define mrn_declare_plugin_end    mysql_declare_plugin_end
#  define MRN_PLUGIN_LAST_VALUES    NULL, 0
#endif

#if MYSQL_VERSION_ID >= 100007 && defined(MRN_MARIADB_P)
#  define MRN_THD_GET_AUTOINC(thd, off, inc) thd_get_autoinc(thd, off, inc)
#  define MRN_GET_ERR_MSG(code) my_get_err_msg(code)
#else
#  define MRN_THD_GET_AUTOINC(thd, off, inc) \
     { \
        *(off) = thd->variables.auto_increment_offset; \
        *(inc) = thd->variables.auto_increment_increment; \
     }
#  define MRN_GET_ERR_MSG(code) ER(code)
#endif

#if MYSQL_VERSION_ID >= 50706 && !defined(MRN_MARIADB_P)
#  define MRN_LEX_GET_TABLE_LIST(lex) (lex)->select_lex->table_list.first
#else
#  define MRN_LEX_GET_TABLE_LIST(lex) (lex)->first_select_lex()->table_list.first
#endif

#if MYSQL_VERSION_ID >= 50706 && !defined(MRN_MARIADB_P)
#  define MRN_KEYTYPE_FOREIGN KEYTYPE_FOREIGN
#else
#  define MRN_KEYTYPE_FOREIGN Key::FOREIGN_KEY
#endif

#if MYSQL_VERSION_ID >= 50706 && !defined(MRN_MARIADB_P)
#  define mrn_calculate_key_len(table, key_index, buffer, keypart_map) \
  calculate_key_len(table, key_index, keypart_map)
#else
#  define mrn_calculate_key_len(table, key_index, buffer, keypart_map) \
  calculate_key_len(table, key_index, buffer, keypart_map)
#endif

#if MYSQL_VERSION_ID >= 50706 && !defined(MRN_MARIADB_P)
#  define MRN_TABLE_LIST_GET_DERIVED(table_list) NULL
#else
#  define MRN_TABLE_LIST_GET_DERIVED(table_list) (table_list)->derived
#endif

#if MYSQL_VERSION_ID >= 50706 && !defined(MRN_MARIADB_P)
#  define MRN_GEOMETRY_FREE(geometry)
#else
#  define MRN_GEOMETRY_FREE(geometry) delete (geometry)
#endif

Rpl_filter *mrn_binlog_filter;
Time_zone *mrn_my_tz_UTC;
#ifdef MRN_HAVE_TABLE_DEF_CACHE
HASH *mrn_table_def_cache;
#endif

PSI_memory_key mrn_memory_key;

#ifdef MRN_HAVE_PSI_MEMORY_KEY
static PSI_memory_info mrn_all_memory_keys[]=
{
  {&mrn_memory_key, "Mroonga", 0}
};
#endif

static const char *INDEX_COLUMN_NAME = "index";
static const char *MRN_PLUGIN_AUTHOR = "The Mroonga project";

#ifdef __cplusplus
extern "C" {
#endif

#ifdef HAVE_PSI_INTERFACE
#  ifdef WIN32
#    ifdef MRN_TABLE_SHARE_HAVE_LOCK_SHARE
PSI_mutex_key *mrn_table_share_lock_share;
#    endif
PSI_mutex_key *mrn_table_share_lock_ha_data;
#  endif
static PSI_mutex_key mrn_open_tables_mutex_key;
static PSI_mutex_key mrn_long_term_share_mutex_key;
static PSI_mutex_key mrn_allocated_thds_mutex_key;
PSI_mutex_key mrn_share_mutex_key;
PSI_mutex_key mrn_long_term_share_auto_inc_mutex_key;
static PSI_mutex_key mrn_log_mutex_key;
static PSI_mutex_key mrn_query_log_mutex_key;
static PSI_mutex_key mrn_db_manager_mutex_key;
static PSI_mutex_key mrn_context_pool_mutex_key;
static PSI_mutex_key mrn_operations_mutex_key;

#  if (!defined(MRN_MARIADB_P) && MYSQL_VERSION_ID >= 80002)
#    define MRN_MUTEXT_INFO_ENTRY(key, name, flags, volatility) \
  {key, name, flags, volatility}
#  else
#    define MRN_MUTEXT_INFO_ENTRY(key, name, flags, volatility) \
  {key, name, flags}
#  endif

static PSI_mutex_info mrn_mutexes[] =
{
  MRN_MUTEXT_INFO_ENTRY(&mrn_open_tables_mutex_key,
                        "mrn::open_tables", PSI_FLAG_GLOBAL, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_long_term_share_mutex_key,
                        "mrn::long_term_share", PSI_FLAG_GLOBAL, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_allocated_thds_mutex_key,
                        "mrn::allocated_thds", PSI_FLAG_GLOBAL, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_share_mutex_key,
                        "mrn::share", 0, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_long_term_share_auto_inc_mutex_key,
                        "mrn::long_term_share::auto_inc", 0, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_log_mutex_key,
                        "mrn::log", PSI_FLAG_GLOBAL, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_query_log_mutex_key,
                        "mrn::query_log", PSI_FLAG_GLOBAL, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_db_manager_mutex_key,
                        "mrn::DatabaseManager", PSI_FLAG_GLOBAL, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_context_pool_mutex_key,
                        "mrn::ContextPool", PSI_FLAG_GLOBAL, 0),
  MRN_MUTEXT_INFO_ENTRY(&mrn_operations_mutex_key,
                        "mrn::Operations", PSI_FLAG_GLOBAL, 0)
};
#endif

/* global variables */
bool mrn_initialized = false;
handlerton *mrn_hton_ptr;
HASH mrn_open_tables;
mysql_mutex_t mrn_open_tables_mutex;
HASH mrn_long_term_share;
mysql_mutex_t mrn_long_term_share_mutex;

HASH mrn_allocated_thds;
mysql_mutex_t mrn_allocated_thds_mutex;

/* internal variables */
static grn_ctx mrn_ctx;
static mysql_mutex_t mrn_log_mutex;
static mysql_mutex_t mrn_query_log_mutex;
static grn_obj *mrn_db;
static grn_ctx mrn_db_manager_ctx;
static mysql_mutex_t mrn_db_manager_mutex;
mrn::DatabaseManager *mrn_db_manager = NULL;
static mysql_mutex_t mrn_context_pool_mutex;
mrn::ContextPool *mrn_context_pool = NULL;
static mysql_mutex_t mrn_operations_mutex;


#ifdef WIN32
static inline double round(double x)
{
  return (floor(x + 0.5));
}
#endif

static void mrn_init_encoding_map()
{
  mrn::encoding::init();
}

static int mrn_change_encoding(grn_ctx *ctx, const CHARSET_INFO *charset)
{
  return mrn::encoding::set(ctx, charset);
}

#if defined DBUG_TRACE
static const char *mrn_inspect_thr_lock_type(enum thr_lock_type lock_type)
{
  const char *inspected = "<unknown>";
  switch (lock_type) {
  case TL_IGNORE:
    inspected = "TL_IGNORE";
    break;
  case TL_UNLOCK:
    inspected = "TL_UNLOCK";
    break;
  case TL_READ_DEFAULT:
    inspected = "TL_READ_DEFAULT";
    break;
  case TL_READ:
    inspected = "TL_READ";
    break;
  case TL_READ_WITH_SHARED_LOCKS:
    inspected = "TL_READ_WITH_SHARED_LOCKS";
    break;
  case TL_READ_HIGH_PRIORITY:
    inspected = "TL_READ_HIGH_PRIORITY";
    break;
  case TL_READ_NO_INSERT:
    inspected = "TL_READ_NO_INSERT";
    break;
  case TL_READ_SKIP_LOCKED:
    inspected = "TL_READ_SKIP_LOCKED";
    break;
  case TL_WRITE_ALLOW_WRITE:
    inspected = "TL_WRITE_ALLOW_WRITE";
    break;
#ifdef MRN_HAVE_TL_WRITE_CONCURRENT_DEFAULT
  case TL_WRITE_CONCURRENT_DEFAULT:
    inspected = "TL_WRITE_CONCURRENT_DEFAULT";
    break;
#endif
  case TL_WRITE_CONCURRENT_INSERT:
    inspected = "TL_WRITE_CONCURRENT_INSERT";
    break;
#ifdef MRN_HAVE_TL_WRITE_DELAYED
  case TL_WRITE_DELAYED:
    inspected = "TL_WRITE_DELAYED";
    break;
#endif
  case TL_WRITE_DEFAULT:
    inspected = "TL_WRITE_DEFAULT";
    break;
  case TL_WRITE_LOW_PRIORITY:
    inspected = "TL_WRITE_LOW_PRIORITY";
    break;
  case TL_WRITE:
    inspected = "TL_WRITE";
    break;
  case TL_WRITE_SKIP_LOCKED:
    inspected = "TL_WRITE_SKIP_LOCKED";
    break;
  case TL_WRITE_ONLY:
    inspected = "TL_WRITE_ONLY";
    break;
  }
  return inspected;
}

static const char *mrn_inspect_extra_function(enum ha_extra_function operation)
{
  const char *inspected = "<unknown>";
  switch (operation) {
  case HA_EXTRA_NORMAL:
    inspected = "HA_EXTRA_NORMAL";
    break;
  case HA_EXTRA_QUICK:
    inspected = "HA_EXTRA_QUICK";
    break;
  case HA_EXTRA_NOT_USED:
    inspected = "HA_EXTRA_NOT_USED";
    break;
  case HA_EXTRA_CACHE:
    inspected = "HA_EXTRA_CACHE";
    break;
  case HA_EXTRA_NO_CACHE:
    inspected = "HA_EXTRA_NO_CACHE";
    break;
  case HA_EXTRA_NO_READCHECK:
    inspected = "HA_EXTRA_NO_READCHECK";
    break;
  case HA_EXTRA_READCHECK:
    inspected = "HA_EXTRA_READCHECK";
    break;
  case HA_EXTRA_KEYREAD:
    inspected = "HA_EXTRA_KEYREAD";
    break;
  case HA_EXTRA_NO_KEYREAD:
    inspected = "HA_EXTRA_NO_KEYREAD";
    break;
  case HA_EXTRA_NO_USER_CHANGE:
    inspected = "HA_EXTRA_NO_USER_CHANGE";
    break;
  case HA_EXTRA_KEY_CACHE:
    inspected = "HA_EXTRA_KEY_CACHE";
    break;
  case HA_EXTRA_NO_KEY_CACHE:
    inspected = "HA_EXTRA_NO_KEY_CACHE";
    break;
  case HA_EXTRA_WAIT_LOCK:
    inspected = "HA_EXTRA_WAIT_LOCK";
    break;
  case HA_EXTRA_NO_WAIT_LOCK:
    inspected = "HA_EXTRA_NO_WAIT_LOCK";
    break;
  case HA_EXTRA_WRITE_CACHE:
    inspected = "HA_EXTRA_WRITE_CACHE";
    break;
  case HA_EXTRA_FLUSH_CACHE:
    inspected = "HA_EXTRA_FLUSH_CACHE";
    break;
  case HA_EXTRA_NO_KEYS:
    inspected = "HA_EXTRA_NO_KEYS";
    break;
  case HA_EXTRA_KEYREAD_CHANGE_POS:
    inspected = "HA_EXTRA_KEYREAD_CHANGE_POS";
    break;
  case HA_EXTRA_REMEMBER_POS:
    inspected = "HA_EXTRA_REMEMBER_POS";
    break;
  case HA_EXTRA_RESTORE_POS:
    inspected = "HA_EXTRA_RESTORE_POS";
    break;
  case HA_EXTRA_REINIT_CACHE:
    inspected = "HA_EXTRA_REINIT_CACHE";
    break;
  case HA_EXTRA_FORCE_REOPEN:
    inspected = "HA_EXTRA_FORCE_REOPEN";
    break;
  case HA_EXTRA_FLUSH:
    inspected = "HA_EXTRA_FLUSH";
    break;
  case HA_EXTRA_NO_ROWS:
    inspected = "HA_EXTRA_NO_ROWS";
    break;
  case HA_EXTRA_RESET_STATE:
    inspected = "HA_EXTRA_RESET_STATE";
    break;
  case HA_EXTRA_IGNORE_DUP_KEY:
    inspected = "HA_EXTRA_IGNORE_DUP_KEY";
    break;
  case HA_EXTRA_NO_IGNORE_DUP_KEY:
    inspected = "HA_EXTRA_NO_IGNORE_DUP_KEY";
    break;
  case HA_EXTRA_PREPARE_FOR_DROP:
    inspected = "HA_EXTRA_PREPARE_FOR_DROP";
    break;
  case HA_EXTRA_PREPARE_FOR_ALTER_TABLE:
    inspected = "HA_EXTRA_PREPARE_FOR_ALTER_TABLE";
    break;
  case HA_EXTRA_PREPARE_FOR_UPDATE:
    inspected = "HA_EXTRA_PREPARE_FOR_UPDATE";
    break;
  case HA_EXTRA_PRELOAD_BUFFER_SIZE:
    inspected = "HA_EXTRA_PRELOAD_BUFFER_SIZE";
    break;
  case HA_EXTRA_CHANGE_KEY_TO_UNIQUE:
    inspected = "HA_EXTRA_CHANGE_KEY_TO_UNIQUE";
    break;
  case HA_EXTRA_CHANGE_KEY_TO_DUP:
    inspected = "HA_EXTRA_CHANGE_KEY_TO_DUP";
    break;
  case HA_EXTRA_KEYREAD_PRESERVE_FIELDS:
    inspected = "HA_EXTRA_KEYREAD_PRESERVE_FIELDS";
    break;
  case HA_EXTRA_MMAP:
    inspected = "HA_EXTRA_MMAP";
    break;
  case HA_EXTRA_IGNORE_NO_KEY:
    inspected = "HA_EXTRA_IGNORE_NO_KEY";
    break;
  case HA_EXTRA_NO_IGNORE_NO_KEY:
    inspected = "HA_EXTRA_NO_IGNORE_NO_KEY";
    break;
  case HA_EXTRA_MARK_AS_LOG_TABLE:
    inspected = "HA_EXTRA_MARK_AS_LOG_TABLE";
    break;
  case HA_EXTRA_WRITE_CAN_REPLACE:
    inspected = "HA_EXTRA_WRITE_CAN_REPLACE";
    break;
  case HA_EXTRA_WRITE_CANNOT_REPLACE:
    inspected = "HA_EXTRA_WRITE_CANNOT_REPLACE";
    break;
  case HA_EXTRA_DELETE_CANNOT_BATCH:
    inspected = "HA_EXTRA_DELETE_CANNOT_BATCH";
    break;
  case HA_EXTRA_UPDATE_CANNOT_BATCH:
    inspected = "HA_EXTRA_UPDATE_CANNOT_BATCH";
    break;
  case HA_EXTRA_INSERT_WITH_UPDATE:
    inspected = "HA_EXTRA_INSERT_WITH_UPDATE";
    break;
  case HA_EXTRA_PREPARE_FOR_RENAME:
    inspected = "HA_EXTRA_PREPARE_FOR_RENAME";
    break;
  case HA_EXTRA_ADD_CHILDREN_LIST:
    inspected = "HA_EXTRA_ADD_CHILDREN_LIST";
    break;
  case HA_EXTRA_ATTACH_CHILDREN:
    inspected = "HA_EXTRA_ATTACH_CHILDREN";
    break;
  case HA_EXTRA_IS_ATTACHED_CHILDREN:
    inspected = "HA_EXTRA_IS_ATTACHED_CHILDREN";
    break;
  case HA_EXTRA_DETACH_CHILDREN:
    inspected = "HA_EXTRA_DETACH_CHILDREN";
    break;
  case HA_EXTRA_STARTING_ORDERED_INDEX_SCAN:
    inspected = "HA_EXTRA_STARTING_ORDERED_INDEX_SCAN";
    break;
  case HA_EXTRA_BEGIN_COPY:
    inspected = "HA_EXTRA_BEGIN_COPY";
    break;
  case HA_EXTRA_END_COPY:
    inspected = "HA_EXTRA_END_COPY";
    break;
  case HA_EXTRA_ABORT_COPY:
    inspected = "HA_EXTRA_ABORT_COPY";
    break;
  case HA_EXTRA_BEGIN_ALTER_IGNORE_COPY:
    inspected = "HA_EXTRA_BEGIN_ALTER_IGNORE_COPY";
    break;
#ifdef MRN_HAVE_HA_EXTRA_EXPORT
  case HA_EXTRA_EXPORT:
    inspected = "HA_EXTRA_EXPORT";
    break;
#endif
#ifdef MRN_HAVE_HA_EXTRA_SECONDARY_SORT_ROWID
  case HA_EXTRA_SECONDARY_SORT_ROWID:
    inspected = "HA_EXTRA_SECONDARY_SORT_ROWID";
    break;
#endif
#ifdef MRN_HAVE_HA_EXTRA_DETACH_CHILD
  case HA_EXTRA_DETACH_CHILD:
    inspected = "HA_EXTRA_DETACH_CHILD";
    break;
#endif
#ifdef MRN_HAVE_HA_EXTRA_PREPARE_FOR_FORCED_CLOSE
  case HA_EXTRA_PREPARE_FOR_FORCED_CLOSE:
    inspected = "HA_EXTRA_PREPARE_FOR_FORCED_CLOSE";
    break;
#endif
#ifdef MRN_HAVE_HA_EXTRA_SKIP_SERIALIZABLE_DD_VIEW
  case HA_EXTRA_SKIP_SERIALIZABLE_DD_VIEW:
    inspected = "HA_EXTRA_SKIP_SERIALIZABLE_DD_VIEW";
    break;
#endif
#ifdef MRN_HAVE_HA_EXTRA_BEGIN_COPY
  case HA_EXTRA_BEGIN_COPY:
    inspected = "HA_EXTRA_BEGIN_COPY";
    break;
#endif
#ifdef MRN_HAVE_HA_EXTRA_END_COPY
  case HA_EXTRA_END_COPY:
    inspected = "HA_EXTRA_END_COPY";
    break;
#endif
#ifdef MRN_HAVE_HA_EXTRA_ABORT_COPY
  case HA_EXTRA_ABORT_COPY:
    inspected = "HA_EXTRA_ABORT_COPY";
    break;
#endif
#ifdef MRN_HAVE_HA_EXTRA_NO_AUTOINC_LOCKING
  case HA_EXTRA_NO_AUTOINC_LOCKING:
    inspected = "HA_EXTRA_NO_AUTOINC_LOCKING";
    break;
#endif
  }
  return inspected;
}
#endif

static const uchar *mrn_open_tables_get_key(const void *record, size_t *length,
                                            my_bool)
{
  MRN_DBUG_ENTER_FUNCTION();
  auto share = static_cast<const MRN_SHARE *>(record);
  *length = share->table_name_length;
  DBUG_RETURN(reinterpret_cast<const uchar *>(share->table_name));
}

static const uchar *mrn_long_term_share_get_key(const void *record,
                                                size_t *length, my_bool)
{
  MRN_DBUG_ENTER_FUNCTION();
  auto long_term_share= static_cast<const MRN_LONG_TERM_SHARE *>(record);
  *length = long_term_share->table_name_length;
  DBUG_RETURN(reinterpret_cast<const uchar *>(long_term_share->table_name));
}

/* status */
static long mrn_count_skip = 0;
static long mrn_fast_order_limit = 0;

/* logging */
static char *mrn_log_file_path = NULL;
static FILE *mrn_log_file = NULL;
static bool mrn_log_file_opened = false;
static grn_log_level mrn_log_level_default = GRN_LOG_DEFAULT_LEVEL;
static ulong mrn_log_level = mrn_log_level_default;
static char *mrn_query_log_file_path = NULL;

char *mrn_default_tokenizer = NULL;
char *mrn_default_wrapper_engine = NULL;
static int mrn_lock_timeout = grn_get_lock_timeout();
static char *mrn_libgroonga_version = const_cast<char *>(grn_get_version());
static char *mrn_version = const_cast<char *>(MRN_VERSION);
static char *mrn_vector_column_delimiter = NULL;
static mrn_bool mrn_libgroonga_support_zlib = false;
static mrn_bool mrn_libgroonga_support_lz4 = false;
static mrn_bool mrn_libgroonga_support_zstd = false;
static mrn_bool mrn_enable_operations_recording = true;
#ifdef MRN_SUPPORT_THDVAR_SET
static const char *mrn_boolean_mode_sytnax_flag_names[] = {
  "DEFAULT",
  "SYNTAX_QUERY",
  "SYNTAX_SCRIPT",
  "ALLOW_COLUMN",
  "ALLOW_UPDATE",
  "ALLOW_LEADING_NOT",
  NullS
};
static TYPELIB mrn_boolean_mode_syntax_flags_typelib =
                CREATE_TYPELIB_FOR(mrn_boolean_mode_sytnax_flag_names);
#endif
#ifdef MRN_GROONGA_EMBEDDED
static mrn_bool mrn_libgroonga_embedded = true;
#else
static mrn_bool mrn_libgroonga_embedded = false;
#endif

static mrn::variables::ActionOnError mrn_action_on_fulltext_query_error_default =
  mrn::variables::ACTION_ON_ERROR_ERROR_AND_LOG;

static void mrn_logger_log(grn_ctx *ctx, grn_log_level level,
                           const char *timestamp, const char *title,
                           const char *message, const char *location,
                           void *user_data)
{
  const char level_marks[] = " EACewnid-";
  if (mrn_log_file_opened) {
    mrn::Lock lock(&mrn_log_mutex);
    fprintf(mrn_log_file,
            "%s|%c|%08x|%s\n",
            timestamp,
            level_marks[level],
            static_cast<uint>((ulong)(pthread_self())),
            message);
    fflush(mrn_log_file);
  }
}

static grn_logger mrn_logger = {
  mrn_log_level_default,
  GRN_LOG_TIME|GRN_LOG_MESSAGE,
  NULL,
  mrn_logger_log,
  NULL,
  NULL
};

static const uchar *mrn_allocated_thds_get_key(const void *record,
                                               size_t *length, my_bool)
{
  MRN_DBUG_ENTER_FUNCTION();
  *length = sizeof(THD *);
  DBUG_RETURN(static_cast<const uchar *>(record));
}

/* system functions */

static struct st_mysql_storage_engine storage_engine_structure =
{ MYSQL_HANDLERTON_INTERFACE_VERSION };

#if MYSQL_VERSION_ID >= 50706 && !defined(MRN_MARIADB_P)
#  define MRN_STATUS_VARIABLE_ENTRY(name, value, type, scope) \
  {name, value, type, scope}
#else
#  define MRN_STATUS_VARIABLE_ENTRY(name, value, type, scope) \
  {name, value, type}
#endif

static struct st_mysql_show_var mrn_status_variables[] =
{
  MRN_STATUS_VARIABLE_ENTRY(MRN_STATUS_VARIABLE_NAME_PREFIX_STRING "_count_skip",
                            (char *)&mrn_count_skip,
                            SHOW_LONG,
                            SHOW_SCOPE_GLOBAL),
  MRN_STATUS_VARIABLE_ENTRY(MRN_STATUS_VARIABLE_NAME_PREFIX_STRING "_fast_order_limit",
                            (char *)&mrn_fast_order_limit,
                            SHOW_LONG,
                            SHOW_SCOPE_GLOBAL),
  MRN_STATUS_VARIABLE_ENTRY(NullS, NullS, SHOW_LONG, SHOW_SCOPE_GLOBAL)
};

static const char *mrn_log_level_type_names[] = {
  "NONE",
  "EMERG",
  "ALERT",
  "CRIT",
  "ERROR",
  "WARNING",
  "NOTICE",
  "INFO",
  "DEBUG",
  "DUMP",
  NullS
};
static TYPELIB mrn_log_level_typelib =
                CREATE_TYPELIB_FOR(mrn_log_level_type_names);

static void mrn_log_level_update(THD *thd, struct st_mysql_sys_var *var,
                                 void *var_ptr, const void *save)
{
  MRN_DBUG_ENTER_FUNCTION();
  ulong new_value = *static_cast<const ulong *>(save);
  ulong old_value = mrn_log_level;
  mrn_log_level = new_value;
  mrn_logger.max_level = static_cast<grn_log_level>(mrn_log_level);
  grn_logger_set(&mrn_ctx, &mrn_logger);
  grn_ctx *ctx = grn_ctx_open(0);
  mrn_change_encoding(ctx, system_charset_info);
  GRN_LOG(ctx, GRN_LOG_NOTICE, "log level changed from '%s' to '%s'",
          mrn_log_level_type_names[old_value],
          mrn_log_level_type_names[new_value]);
  grn_ctx_fin(ctx);
  DBUG_VOID_RETURN;
}

static MYSQL_SYSVAR_ENUM(log_level, mrn_log_level,
                         PLUGIN_VAR_RQCMDARG,
                         "logging level",
                         NULL,
                         mrn_log_level_update,
                         static_cast<ulong>(mrn_log_level),
                         &mrn_log_level_typelib);

static int mrn_log_file_check(THD *thd, struct st_mysql_sys_var *var,
                              void *save, struct st_mysql_value *value)
{
  MRN_DBUG_ENTER_FUNCTION();

  char buf[STRING_BUFFER_USUAL_SIZE];
  int len = sizeof(buf);
  const char* new_value = value->val_str(value, buf, &len);

  if (!new_value || len == 0) {
    my_printf_error(ER_MRN_INVALID_NULL_VALUE_NUM,
                    ER_MRN_INVALID_NULL_VALUE_STR,
                    MYF(0),
                    "mroonga_log_file");
    DBUG_RETURN(1);
  }

  *((const char**)save) = thd->strmake(new_value, len);

  DBUG_RETURN(0);
}
static void mrn_log_file_update(THD *thd, struct st_mysql_sys_var *var,
                                void *var_ptr, const void *save)
{
  MRN_DBUG_ENTER_FUNCTION();
  const char *new_value = *((const char **)save);
  char **old_value_ptr = (char **)var_ptr;

  grn_ctx *ctx = &mrn_ctx;
  mrn_change_encoding(ctx, system_charset_info);

  const char *new_log_file_name;
  new_log_file_name = *old_value_ptr;

  if (strcmp(*old_value_ptr, new_value) == 0) {
    GRN_LOG(ctx, GRN_LOG_NOTICE,
            "log file isn't changed "
            "because the requested path isn't different: <%s>",
            new_value);
  } else {
    GRN_LOG(ctx, GRN_LOG_NOTICE,
            "log file is changed: <%s> -> <%s>",
            *old_value_ptr, new_value);

    int log_file_open_errno = 0;
    {
      mrn::Lock lock(&mrn_log_mutex);
      FILE *new_log_file;
      new_log_file = fopen(new_value, "a");
      if (new_log_file) {
        if (mrn_log_file_opened) {
          fclose(mrn_log_file);
        }
        mrn_log_file = new_log_file;
        mrn_log_file_opened = true;
      } else {
        log_file_open_errno = errno;
      }
    }

    if (log_file_open_errno == 0) {
      GRN_LOG(ctx, GRN_LOG_NOTICE,
              "log file is changed: <%s> -> <%s>",
              *old_value_ptr, new_value);
      new_log_file_name = new_value;
    } else {
      if (mrn_log_file) {
        GRN_LOG(ctx, GRN_LOG_ERROR,
                "log file isn't changed "
                "because the requested path can't be opened: <%s>: <%s>",
                new_value, strerror(log_file_open_errno));
      } else {
        GRN_LOG(ctx, GRN_LOG_ERROR,
                "log file can't be opened: <%s>: <%s>",
                new_value, strerror(log_file_open_errno));
      }
    }
  }

#ifdef MRN_NEED_FREE_STRING_MEMALLOC_PLUGIN_VAR
  char *old_log_file_name = *old_value_ptr;
  *old_value_ptr = mrn_my_strdup(new_log_file_name, MYF(MY_WME));
  my_free(old_log_file_name);
#else
  *old_value_ptr = mrn_my_strdup(new_log_file_name, MYF(MY_WME));
#endif

  DBUG_VOID_RETURN;
}

static MYSQL_SYSVAR_STR(log_file, mrn_log_file_path,
                        PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
                        "log file for " MRN_PLUGIN_NAME_STRING,
                        mrn_log_file_check,
                        mrn_log_file_update,
                        MRN_LOG_FILE_PATH);

static void mrn_query_log_file_update(THD *thd, struct st_mysql_sys_var *var,
                                      void *var_ptr, const void *save)
{
  MRN_DBUG_ENTER_FUNCTION();
  const char *new_value = *((const char **)save);
  char **old_value_ptr = (char **)var_ptr;
  const char *normalized_new_value = NULL;

  grn_ctx *ctx = &mrn_ctx;
  mrn_change_encoding(ctx, system_charset_info);

  const char *new_query_log_file_name;
  new_query_log_file_name = *old_value_ptr;

  bool need_update = false;
  if (!*old_value_ptr) {
    if (new_value && new_value[0] != '\0') {
      GRN_LOG(ctx, GRN_LOG_NOTICE,
              "query log is enabled: <%s>",
              new_value);
      need_update = true;
      normalized_new_value = new_value;
    } else {
      GRN_LOG(ctx, GRN_LOG_NOTICE,
              "query log file is still disabled");
    }
  } else {
    if (!new_value || new_value[0] == '\0') {
      GRN_LOG(ctx, GRN_LOG_NOTICE,
              "query log file is disabled: <%s>",
              *old_value_ptr);
      need_update = true;
      normalized_new_value = NULL;
    } else if (strcmp(*old_value_ptr, new_value) == 0) {
      GRN_LOG(ctx, GRN_LOG_NOTICE,
              "query log file isn't changed "
              "because the requested path isn't different: <%s>",
              new_value);
    } else {
      GRN_LOG(ctx, GRN_LOG_NOTICE,
              "query log file is changed: <%s> -> <%s>",
              *old_value_ptr, new_value);
      need_update = true;
      normalized_new_value = new_value;
    }
  }

  if (need_update) {
    { // TODO: Remove me when Groonga 7.0.5 is released.
      mrn::Lock lock(&mrn_query_log_mutex);
      grn_default_query_logger_set_path(normalized_new_value);
    }
    grn_query_logger_reopen(ctx);
    new_query_log_file_name = normalized_new_value;
  }

#ifdef MRN_NEED_FREE_STRING_MEMALLOC_PLUGIN_VAR
  char *old_query_log_file_name = *old_value_ptr;
#endif
  if (new_query_log_file_name) {
    *old_value_ptr = mrn_my_strdup(new_query_log_file_name, MYF(0));
  } else {
    *old_value_ptr = NULL;
  }
#ifdef MRN_NEED_FREE_STRING_MEMALLOC_PLUGIN_VAR
  my_free(old_query_log_file_name);
#endif

  DBUG_VOID_RETURN;
}

static MYSQL_SYSVAR_STR(query_log_file, mrn_query_log_file_path,
                        PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
                        "query log file for " MRN_PLUGIN_NAME_STRING,
                        NULL,
                        mrn_query_log_file_update,
                        NULL);

static void mrn_default_tokenizer_update(THD *thd, struct st_mysql_sys_var *var,
                                         void *var_ptr, const void *save)
{
  MRN_DBUG_ENTER_FUNCTION();
  const char *new_value = *((const char **)save);
  char **old_value_ptr = (char **)var_ptr;
  grn_ctx *ctx = &mrn_ctx;

  if(!new_value) {
    new_value = "off";
#ifndef MRN_NEED_FREE_STRING_MEMALLOC_PLUGIN_VAR
    new_value = mrn_my_strdup(new_value, MYF(MY_WME));
#endif
  }
  mrn_change_encoding(ctx, system_charset_info);
  if (strcmp(*old_value_ptr, new_value) == 0) {
    GRN_LOG(ctx, GRN_LOG_NOTICE,
            "default tokenizer for fulltext index isn't changed "
            "because the requested default tokenizer isn't different: <%s>",
            new_value);
  } else {
    GRN_LOG(ctx, GRN_LOG_NOTICE,
            "default tokenizer for fulltext index is changed: <%s> -> <%s>",
            *old_value_ptr, new_value);
  }

#ifdef MRN_NEED_FREE_STRING_MEMALLOC_PLUGIN_VAR
  my_free(*old_value_ptr);
  *old_value_ptr = mrn_my_strdup(new_value, MYF(MY_WME));
#else
  *old_value_ptr = (char *)new_value;
#endif

  DBUG_VOID_RETURN;
}

static MYSQL_SYSVAR_STR(default_parser, mrn_default_tokenizer,
                        PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
                        "default fulltext parser "
                        "(Deprecated. Use mroonga_default_tokenizer instead.)",
                        NULL,
                        mrn_default_tokenizer_update,
                        MRN_DEFAULT_TOKENIZER); // since 10.1.6

static MYSQL_SYSVAR_STR(default_tokenizer, mrn_default_tokenizer,
                        PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
                        "default tokenizer for fulltext index",
                        NULL,
                        mrn_default_tokenizer_update,
                        MRN_DEFAULT_TOKENIZER);

static MYSQL_THDVAR_BOOL(
  dry_write, /* name */
  PLUGIN_VAR_OPCMDARG, /* options */
  "If dry_write is true, any write operations are ignored", /* comment */
  NULL, /* check */
  NULL, /* update */
  false /* default */
);

static MYSQL_THDVAR_BOOL(
  enable_optimization, /* name */
  PLUGIN_VAR_OPCMDARG, /* options */
  "If enable_optimization is true, some optimizations will be applied", /* comment */
  NULL, /* check */
  NULL, /* update */
  true /* default */
);

static MYSQL_THDVAR_LONGLONG(match_escalation_threshold,
                             PLUGIN_VAR_RQCMDARG,
                             "The threshold to determin whether search method is escalated",
                             NULL,
                             NULL,
                             grn_get_default_match_escalation_threshold(),
                             -1,
                             INT_MAX64,
                             0);

static void mrn_vector_column_delimiter_update(THD *thd, struct st_mysql_sys_var *var,
                                               void *var_ptr, const void *save)
{
  MRN_DBUG_ENTER_FUNCTION();
  const char *new_value = *((const char **)save);
  char **old_value_ptr = (char **)var_ptr;

#ifdef MRN_NEED_FREE_STRING_MEMALLOC_PLUGIN_VAR
  my_free(*old_value_ptr);
  *old_value_ptr = mrn_my_strdup(new_value, MYF(MY_WME));
#else
  *old_value_ptr = (char *)new_value;
#endif

  DBUG_VOID_RETURN;
}

static MYSQL_SYSVAR_STR(vector_column_delimiter, mrn_vector_column_delimiter,
                        PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
                        "The vector column delimiter",
                        NULL,
                        &mrn_vector_column_delimiter_update,
                        " ");

static void mrn_database_path_prefix_update(THD *thd,
                                            struct st_mysql_sys_var *var,
                                            void *var_ptr, const void *save)
{
  MRN_DBUG_ENTER_FUNCTION();
  const char *new_value = *((const char **)save);
  char **old_value_ptr = (char **)var_ptr;
#ifdef MRN_NEED_FREE_STRING_MEMALLOC_PLUGIN_VAR
  if (*old_value_ptr)
    my_free(*old_value_ptr);
  if (new_value)
    *old_value_ptr = mrn_my_strdup(new_value, MYF(MY_WME));
  else
    *old_value_ptr = NULL;
#else
  *old_value_ptr = (char *)new_value;
#endif
  DBUG_VOID_RETURN;
}

static MYSQL_SYSVAR_STR(database_path_prefix,
                        mrn::PathMapper::default_path_prefix,
                        PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
                        "The database path prefix",
                        NULL,
                        &mrn_database_path_prefix_update,
                        NULL);

static MYSQL_SYSVAR_STR(default_wrapper_engine, mrn_default_wrapper_engine,
                        PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
                        "The default engine for wrapper mode",
                        NULL,
                        NULL,
                        NULL);

static const char *mrn_action_on_error_names[] = {
  "ERROR",
  "ERROR_AND_LOG",
  "IGNORE",
  "IGNORE_AND_LOG",
  NullS,
};

static TYPELIB mrn_action_on_error_typelib =
                CREATE_TYPELIB_FOR(mrn_action_on_error_names);

static MYSQL_THDVAR_ENUM(action_on_fulltext_query_error,
                         PLUGIN_VAR_RQCMDARG,
                         "action on fulltext query error",
                         NULL,
                         NULL,
                         mrn_action_on_fulltext_query_error_default,
                         &mrn_action_on_error_typelib);

static void mrn_lock_timeout_update(THD *thd, struct st_mysql_sys_var *var,
                                    void *var_ptr, const void *save)
{
  MRN_DBUG_ENTER_FUNCTION();
  const int new_value = *static_cast<const int *>(save);
  int *old_value_ptr = static_cast<int *>(var_ptr);

  *old_value_ptr = new_value;
  grn_set_lock_timeout(new_value);

  DBUG_VOID_RETURN;
}

static MYSQL_SYSVAR_INT(lock_timeout,
                        mrn_lock_timeout,
                        PLUGIN_VAR_RQCMDARG,
                        "lock timeout used in Groonga",
                        NULL,
                        mrn_lock_timeout_update,
                        grn_get_lock_timeout(),
                        -1,
                        INT_MAX,
                        1);

static MYSQL_SYSVAR_STR(libgroonga_version, mrn_libgroonga_version,
                        PLUGIN_VAR_NOCMDOPT | PLUGIN_VAR_READONLY,
                        "The version of libgroonga",
                        NULL,
                        NULL,
                        grn_get_version());

static MYSQL_SYSVAR_STR(version, mrn_version,
                        PLUGIN_VAR_NOCMDOPT | PLUGIN_VAR_READONLY,
                        "The version of mroonga",
                        NULL,
                        NULL,
                        MRN_VERSION);

static mrn_bool grn_check_zlib_support()
{
  bool is_zlib_support = false;
  grn_obj grn_support_p;

  GRN_BOOL_INIT(&grn_support_p, 0);
  grn_obj_get_info(&mrn_ctx, NULL, GRN_INFO_SUPPORT_ZLIB, &grn_support_p);
  is_zlib_support = (GRN_BOOL_VALUE(&grn_support_p));
  grn_obj_unlink(&mrn_ctx, &grn_support_p);

  return is_zlib_support;
}

static MYSQL_SYSVAR_BOOL(libgroonga_support_zlib, mrn_libgroonga_support_zlib,
                         PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
                         "The status of libgroonga supports zlib",
                         NULL,
                         NULL,
                         grn_check_zlib_support());

static mrn_bool grn_check_lz4_support()
{
  bool is_lz4_support = false;
  grn_obj grn_support_p;

  GRN_BOOL_INIT(&grn_support_p, 0);
  grn_obj_get_info(&mrn_ctx, NULL, GRN_INFO_SUPPORT_LZ4, &grn_support_p);
  is_lz4_support = (GRN_BOOL_VALUE(&grn_support_p));
  grn_obj_unlink(&mrn_ctx, &grn_support_p);

  return is_lz4_support;
}

static MYSQL_SYSVAR_BOOL(libgroonga_support_lz4, mrn_libgroonga_support_lz4,
                         PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
                         "The status of libgroonga supports LZ4",
                         NULL,
                         NULL,
                         grn_check_lz4_support());

static mrn_bool grn_check_zstd_support()
{
  bool is_zstd_support = false;
  grn_obj grn_support_p;

  GRN_BOOL_INIT(&grn_support_p, 0);
  grn_obj_get_info(&mrn_ctx, NULL, GRN_INFO_SUPPORT_ZSTD, &grn_support_p);
  is_zstd_support = (GRN_BOOL_VALUE(&grn_support_p));
  grn_obj_unlink(&mrn_ctx, &grn_support_p);

  return is_zstd_support;
}

static MYSQL_SYSVAR_BOOL(libgroonga_support_zstd, mrn_libgroonga_support_zstd,
                         PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
                         "The status of libgroonga supports Zstandard",
                         NULL,
                         NULL,
                         grn_check_zstd_support());

static void mrn_enable_operations_recording_update(THD *thd, struct st_mysql_sys_var *var,
                                                   void *var_ptr, const void *save)
{
  MRN_DBUG_ENTER_FUNCTION();
  const bool new_value = *static_cast<const bool *>(save);
  bool *old_value_ptr = static_cast<bool *>(var_ptr);

  *old_value_ptr = new_value;

  DBUG_VOID_RETURN;
}

static MYSQL_SYSVAR_BOOL(enable_operations_recording, mrn_enable_operations_recording,
                         PLUGIN_VAR_RQCMDARG,
                         "Whether recording operations for recovery is enabled or not",
                         NULL,
                         mrn_enable_operations_recording_update,
                         true);

#ifdef MRN_SUPPORT_THDVAR_SET
static MYSQL_THDVAR_SET(boolean_mode_syntax_flags,
                        PLUGIN_VAR_RQCMDARG,
                        "The flags to custom syntax in BOOLEAN MODE. "
                        "Available flags: "
                        "DEFAULT(=SYNTAX_QUERY,ALLOW_LEADING_NOT), "
                        "SYNTAX_QUERY, SYNTAX_SCRIPT, "
                        "ALLOW_COLUMN, ALLOW_UPDATE and ALLOW_LEADING_NOT",
                        NULL,
                        NULL,
                        mrn::variables::BOOLEAN_MODE_SYNTAX_FLAG_DEFAULT,
                        &mrn_boolean_mode_syntax_flags_typelib);
#endif

static const int MRN_MAX_N_RECORDS_FOR_ESTIMATE_DEFAULT = 1000;

static MYSQL_THDVAR_INT(max_n_records_for_estimate,
                        PLUGIN_VAR_RQCMDARG,
                        "The max number of records to "
                        "estimate the number of matched records",
                        NULL,
                        NULL,
                        MRN_MAX_N_RECORDS_FOR_ESTIMATE_DEFAULT,
                        -1,
                        INT_MAX,
                        0);

static MYSQL_SYSVAR_BOOL(libgroonga_embedded, mrn_libgroonga_embedded,
                         PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
                         "Whether libgroonga is embedded or not",
                         NULL,
                         NULL,
                         mrn_libgroonga_embedded);

static struct st_mysql_sys_var *mrn_system_variables[] =
{
  MYSQL_SYSVAR(log_level),
  MYSQL_SYSVAR(log_file),
  MYSQL_SYSVAR(default_parser),
  MYSQL_SYSVAR(default_tokenizer),
  MYSQL_SYSVAR(dry_write),
  MYSQL_SYSVAR(enable_optimization),
  MYSQL_SYSVAR(match_escalation_threshold),
  MYSQL_SYSVAR(database_path_prefix),
  MYSQL_SYSVAR(default_wrapper_engine),
  MYSQL_SYSVAR(action_on_fulltext_query_error),
  MYSQL_SYSVAR(lock_timeout),
  MYSQL_SYSVAR(libgroonga_version),
  MYSQL_SYSVAR(version),
  MYSQL_SYSVAR(vector_column_delimiter),
  MYSQL_SYSVAR(libgroonga_support_zlib),
  MYSQL_SYSVAR(libgroonga_support_lz4),
  MYSQL_SYSVAR(libgroonga_support_zstd),
#ifdef MRN_SUPPORT_THDVAR_SET
  MYSQL_SYSVAR(boolean_mode_syntax_flags),
#endif
  MYSQL_SYSVAR(max_n_records_for_estimate),
  MYSQL_SYSVAR(libgroonga_embedded),
  MYSQL_SYSVAR(query_log_file),
  MYSQL_SYSVAR(enable_operations_recording),
  NULL
};

/* mroonga information schema */
static struct st_mysql_information_schema i_s_info =
{
  MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION
};

namespace Show {
static ST_FIELD_INFO i_s_mrn_stats_fields_info[] =
{
  Column("VERSION",      Varchar(40), NOT_NULL),
  Column("rows_written", SLong(),     NOT_NULL, "Rows written to Groonga"),
  Column("rows_read",    SLong(),     NOT_NULL, "Rows read from Groonga"),
  CEnd()
};
} // namespace Show

static int i_s_mrn_stats_deinit(void* p)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_RETURN(0);
}

static int i_s_mrn_stats_fill(
  THD* thd, TABLE_LIST* tables, Item* cond)
{
  TABLE* table = (TABLE *) tables->table;
  int status = 0;
  MRN_DBUG_ENTER_FUNCTION();
  table->field[0]->store(grn_get_version(), strlen(grn_get_version()),
     system_charset_info);
  table->field[0]->set_notnull();
  table->field[1]->store(1); /* TODO */
  table->field[2]->store(2); /* TODO */
  if (schema_table_store_record(thd, table)) {
    status = 1;
  }
  DBUG_RETURN(status);
}

static int i_s_mrn_stats_init(void* p)
{
  MRN_DBUG_ENTER_FUNCTION();
  ST_SCHEMA_TABLE* schema = (ST_SCHEMA_TABLE*) p;
  schema->fields_info = Show::i_s_mrn_stats_fields_info;
  schema->fill_table = i_s_mrn_stats_fill;
  DBUG_RETURN(0);
}

struct st_mysql_plugin i_s_mrn_stats =
{
  MYSQL_INFORMATION_SCHEMA_PLUGIN,
  &i_s_info,
  MRN_STATUS_VARIABLE_NAME_PREFIX_STRING "_stats",
  MRN_PLUGIN_AUTHOR,
  "Statistics for " MRN_PLUGIN_NAME_STRING,
  PLUGIN_LICENSE_GPL,
  i_s_mrn_stats_init,
#ifdef MRN_ST_MYSQL_PLUGIN_HAVE_CHECK_UNINSTALL
  NULL,
#endif
  i_s_mrn_stats_deinit,
  MRN_VERSION_IN_HEX,
  NULL,
  NULL,
  MRN_PLUGIN_LAST_VALUES
};
/* End of mroonga information schema implementations */

static handler *mrn_handler_create(handlerton *hton,
                                   TABLE_SHARE *share,
#ifdef MRN_HANDLERTON_CREATE_HAVE_PARTITIONED
                                   bool partitioned,
#endif
                                   MEM_ROOT *root)
{
  MRN_DBUG_ENTER_FUNCTION();
  handler *new_handler = new (root) ha_mroonga(hton, share);
  DBUG_RETURN(new_handler);
}

static void mrn_drop_database(handlerton *hton, char *path)
{
  MRN_DBUG_ENTER_FUNCTION();
  mrn_db_manager->drop(path);
  DBUG_VOID_RETURN;
}

static int mrn_close_connection(THD *thd)
{
  MRN_DBUG_ENTER_FUNCTION();
  void *p = thd_get_ha_data(thd, mrn_hton_ptr);
  if (p) {
    mrn_clear_slot_data(thd);
    free(p);
    {
      mrn::Lock lock(&mrn_allocated_thds_mutex);
      my_hash_delete(&mrn_allocated_thds, (uchar*) thd);
    }
  }
  DBUG_RETURN(0);
}

#ifdef MRN_FLUSH_LOGS_HAVE_BINLOG_GROUP_FLUSH
static bool mrn_flush_logs(handlerton *hton, bool binlog_group_flush)
#else
static bool mrn_flush_logs(handlerton *hton)
#endif
{
  MRN_DBUG_ENTER_FUNCTION();
  bool result = 0;
  if (mrn_log_file_opened) {
    mrn::Lock lock(&mrn_log_mutex);
    fclose(mrn_log_file);
    mrn_log_file = fopen(mrn_log_file_path, "a");
  }
  DBUG_RETURN(result);
}

static grn_builtin_type mrn_grn_type_from_field(grn_ctx *ctx, Field *field,
                                                bool for_index_key)
{
  grn_builtin_type type = GRN_DB_VOID;
  enum_field_types mysql_field_type = field->real_type();
  switch (mysql_field_type) {
  case MYSQL_TYPE_DECIMAL:      // DECIMAL; <= 65bytes
    type = GRN_DB_SHORT_TEXT;   // 4Kbytes
    break;
  case MYSQL_TYPE_TINY:         // TINYINT; 1byte
    if (static_cast<Field_num *>(field)->unsigned_flag) {
      type = GRN_DB_UINT8;      // 1byte
    } else {
      type = GRN_DB_INT8;       // 1byte
    }
    break;
  case MYSQL_TYPE_SHORT:        // SMALLINT; 2bytes
    if (static_cast<Field_num *>(field)->unsigned_flag) {
      type = GRN_DB_UINT16;     // 2bytes
    } else {
      type = GRN_DB_INT16;      // 2bytes
    }
    break;
  case MYSQL_TYPE_LONG:         // INT; 4bytes
    if (static_cast<Field_num *>(field)->unsigned_flag) {
      type = GRN_DB_UINT32;     // 4bytes
    } else {
      type = GRN_DB_INT32;      // 4bytes
    }
    break;
  case MYSQL_TYPE_FLOAT:        // FLOAT; 4 or 8bytes
  case MYSQL_TYPE_DOUBLE:       // DOUBLE; 8bytes
    type = GRN_DB_FLOAT;        // 8bytes
    break;
  case MYSQL_TYPE_NULL:         // NULL; 1byte
    type = GRN_DB_INT8;         // 1byte
    break;
  case MYSQL_TYPE_TIMESTAMP:    // TIMESTAMP; 4bytes
    type = GRN_DB_TIME;         // 8bytes
    break;
  case MYSQL_TYPE_LONGLONG:     // BIGINT; 8bytes
    if (static_cast<Field_num *>(field)->unsigned_flag) {
      type = GRN_DB_UINT64;     // 8bytes
    } else {
      type = GRN_DB_INT64;      // 8bytes
    }
    break;
  case MYSQL_TYPE_INT24:        // MEDIUMINT; 3bytes
    if (static_cast<Field_num *>(field)->unsigned_flag) {
      type = GRN_DB_UINT32;     // 4bytes
    } else {
      type = GRN_DB_INT32;      // 4bytes
    }
    break;
  case MYSQL_TYPE_DATE:         // DATE; 4bytes
  case MYSQL_TYPE_TIME:         // TIME; 3bytes
  case MYSQL_TYPE_DATETIME:     // DATETIME; 8bytes
  case MYSQL_TYPE_YEAR:         // YEAR; 1byte
  case MYSQL_TYPE_NEWDATE:      // DATE; 3bytes
    type = GRN_DB_TIME;         // 8bytes
    break;
  case MYSQL_TYPE_VARCHAR:      // VARCHAR; <= 64KB * 4 + 2bytes
    if (for_index_key) {
      type = GRN_DB_SHORT_TEXT; // 4Kbytes
    } else {
      if (field->field_length <= MRN_SHORT_TEXT_SIZE) {
        type = GRN_DB_SHORT_TEXT; //  4Kbytes
      } else if (field->field_length <= MRN_TEXT_SIZE) {
        type = GRN_DB_TEXT;       // 64Kbytes
      } else {
        type = GRN_DB_LONG_TEXT;  //  2Gbytes
      }
    }
    break;
  case MYSQL_TYPE_BIT:          // BIT; <= 8bytes
    type = GRN_DB_INT64;        // 8bytes
    break;
#ifdef MRN_HAVE_MYSQL_TYPE_TIMESTAMP2
  case MYSQL_TYPE_TIMESTAMP2:   // TIMESTAMP; 4bytes
    type = GRN_DB_TIME;         // 8bytes
    break;
#endif
#ifdef MRN_HAVE_MYSQL_TYPE_DATETIME2
  case MYSQL_TYPE_DATETIME2:    // DATETIME; 8bytes
    type = GRN_DB_TIME;         // 8bytes
    break;
#endif
#ifdef MRN_HAVE_MYSQL_TYPE_TIME2
  case MYSQL_TYPE_TIME2:        // TIME(FSP); 3 + (FSP + 1) / 2 bytes
                                // 0 <= FSP <= 6; 3-6bytes
    type = GRN_DB_TIME;         // 8bytes
    break;
#endif
  case MYSQL_TYPE_NEWDECIMAL:   // DECIMAL; <= 9bytes
    type = GRN_DB_SHORT_TEXT;   // 4Kbytes
    break;
  case MYSQL_TYPE_ENUM:         // ENUM; <= 2bytes
    if (field->pack_length() == 1) {
      type = GRN_DB_UINT8;      // 1bytes
    } else {
      type = GRN_DB_UINT16;     // 2bytes
    }
    break;
  case MYSQL_TYPE_SET:          // SET; <= 8bytes
    switch (field->pack_length()) {
    case 1:
      type = GRN_DB_UINT8;      // 1byte
      break;
    case 2:
      type = GRN_DB_UINT16;     // 2bytes
      break;
    case 3:
    case 4:
      type = GRN_DB_UINT32;     // 3bytes
      break;
    case 8:
    default:
      type = GRN_DB_UINT64;     // 8bytes
      break;
    }
    break;
  case MYSQL_TYPE_TINY_BLOB:    // TINYBLOB; <= 256bytes + 1byte
    type = GRN_DB_SHORT_TEXT;   // 4Kbytes
    break;
  case MYSQL_TYPE_MEDIUM_BLOB:  // MEDIUMBLOB; <= 16Mbytes + 3bytes
    if (for_index_key) {
      type = GRN_DB_SHORT_TEXT; // 4Kbytes
    } else {
      type = GRN_DB_LONG_TEXT;  // 2Gbytes
    }
    break;
  case MYSQL_TYPE_LONG_BLOB:    // LONGBLOB; <= 4Gbytes + 4bytes
    if (for_index_key) {
      type = GRN_DB_SHORT_TEXT; // 4Kbytes
    } else {
      type = GRN_DB_LONG_TEXT;  // 2Gbytes
    }
    break;
  case MYSQL_TYPE_BLOB:         // BLOB; <= 64Kbytes + 2bytes
    if (for_index_key) {
      type = GRN_DB_SHORT_TEXT; // 4Kbytes
    } else {
      type = GRN_DB_LONG_TEXT;  // 2Gbytes
    }
    break;
  case MYSQL_TYPE_VAR_STRING:   // VARCHAR; <= 255byte * 4 + 1bytes
    if (for_index_key) {
      type = GRN_DB_SHORT_TEXT; // 4Kbytes
    } else {
      if (field->field_length <= MRN_SHORT_TEXT_SIZE) {
        type = GRN_DB_SHORT_TEXT; //  4Kbytes
      } else if (field->field_length <= MRN_TEXT_SIZE) {
        type = GRN_DB_TEXT;       // 64Kbytes
      } else {
        type = GRN_DB_LONG_TEXT;  //  2Gbytes
      }
    }
    break;
  case MYSQL_TYPE_STRING:       // CHAR; < 1Kbytes =~ (255 * 4)bytes
                                //              4 is the maximum size of a character
    type = GRN_DB_SHORT_TEXT;   // 4Kbytes
    break;
  case MYSQL_TYPE_GEOMETRY:     // case-by-case
    type = GRN_DB_WGS84_GEO_POINT; // 8bytes
    break;
  case MYSQL_TYPE_VARCHAR_COMPRESSED:
  case MYSQL_TYPE_BLOB_COMPRESSED:
    DBUG_ASSERT(0);
#ifdef MRN_HAVE_MYSQL_TYPE_JSON
  case MYSQL_TYPE_JSON:
    type = GRN_DB_TEXT;
    break;
#endif
  }
  return type;
}

static bool mrn_parse_grn_column_create_flags(THD *thd,
                                              grn_ctx *ctx,
                                              const char *flag_names,
                                              uint flag_names_length,
                                              grn_obj_flags *column_flags)
{
  const char *flag_names_end = flag_names + flag_names_length;
  bool found = false;

  while (flag_names < flag_names_end) {
    uint rest_length = flag_names_end - flag_names;

    if (*flag_names == '|' || *flag_names == ' ') {
      flag_names += 1;
      continue;
    }
    if (rest_length >= 13 && !memcmp(flag_names, "COLUMN_SCALAR", 13)) {
      *column_flags |= GRN_OBJ_COLUMN_SCALAR;
      flag_names += 13;
      found = true;
    } else if (rest_length >= 13 && !memcmp(flag_names, "COLUMN_VECTOR", 13)) {
      *column_flags |= GRN_OBJ_COLUMN_VECTOR;
      flag_names += 13;
      found = true;
    } else if (rest_length >= 13 && !memcmp(flag_names, "COMPRESS_ZLIB", 13)) {
      if (mrn_libgroonga_support_zlib) {
        *column_flags |= GRN_OBJ_COMPRESS_ZLIB;
        found = true;
      } else {
        push_warning_printf(thd, MRN_SEVERITY_WARNING,
                            ER_MRN_UNSUPPORTED_COLUMN_FLAG_NUM,
                            ER_MRN_UNSUPPORTED_COLUMN_FLAG_STR,
                            "COMPRESS_ZLIB");
      }
      flag_names += 13;
    } else if (rest_length >= 12 && !memcmp(flag_names, "COMPRESS_LZ4", 12)) {
      if (mrn_libgroonga_support_lz4) {
        *column_flags |= GRN_OBJ_COMPRESS_LZ4;
        found = true;
      } else {
        push_warning_printf(thd, MRN_SEVERITY_WARNING,
                            ER_MRN_UNSUPPORTED_COLUMN_FLAG_NUM,
                            ER_MRN_UNSUPPORTED_COLUMN_FLAG_STR,
                            "COMPRESS_LZ4");
      }
      flag_names += 12;
    } else if (rest_length >= 13 && !memcmp(flag_names, "COMPRESS_ZSTD", 13)) {
      if (mrn_libgroonga_support_zstd) {
        *column_flags |= GRN_OBJ_COMPRESS_ZSTD;
        found = true;
      } else {
        push_warning_printf(thd, MRN_SEVERITY_WARNING,
                            ER_MRN_UNSUPPORTED_COLUMN_FLAG_NUM,
                            ER_MRN_UNSUPPORTED_COLUMN_FLAG_STR,
                            "COMPRESS_ZSTD");
      }
      flag_names += 13;
    } else {
      char invalid_flag_name[MRN_MESSAGE_BUFFER_SIZE];
      snprintf(invalid_flag_name, MRN_MESSAGE_BUFFER_SIZE,
               "%.*s",
               static_cast<int>(rest_length),
               flag_names);
      push_warning_printf(thd, MRN_SEVERITY_WARNING,
                          ER_MRN_INVALID_COLUMN_FLAG_NUM,
                          ER_MRN_INVALID_COLUMN_FLAG_STR,
                          invalid_flag_name);
      break;
    }
  }
  return found;
}

static bool mrn_parse_grn_index_column_flags(THD *thd,
                                             grn_ctx *ctx,
                                             const char *flag_names,
                                             uint flag_names_length,
                                             grn_column_flags *index_column_flags)
{
  const char *flag_names_end = flag_names + flag_names_length;
  bool found = false;

  while (flag_names < flag_names_end) {
    uint rest_length = flag_names_end - flag_names;

    if (*flag_names == '|' || *flag_names == ' ') {
      flag_names += 1;
      continue;
    }
    if (rest_length >= 4 && !memcmp(flag_names, "NONE", 4)) {
      flag_names += 4;
      found = true;
    } else if (rest_length >= 13 && !memcmp(flag_names, "WITH_POSITION", 13)) {
      *index_column_flags |= GRN_OBJ_WITH_POSITION;
      flag_names += 13;
      found = true;
    } else if (rest_length >= 12 && !memcmp(flag_names, "WITH_SECTION", 12)) {
      *index_column_flags |= GRN_OBJ_WITH_SECTION;
      flag_names += 12;
      found = true;
    } else if (rest_length >= 11 && !memcmp(flag_names, "WITH_WEIGHT", 11)) {
      *index_column_flags |= GRN_OBJ_WITH_WEIGHT;
      flag_names += 11;
      found = true;
    } else if (rest_length >= 11 && !memcmp(flag_names, "INDEX_SMALL", 11)) {
      *index_column_flags |= GRN_OBJ_INDEX_SMALL;
      flag_names += 11;
      found = true;
    } else if (rest_length >= 12 && !memcmp(flag_names, "INDEX_MEDIUM", 12)) {
      *index_column_flags |= GRN_OBJ_INDEX_MEDIUM;
      flag_names += 12;
      found = true;
    } else {
      char invalid_flag_name[MRN_MESSAGE_BUFFER_SIZE];
      snprintf(invalid_flag_name, MRN_MESSAGE_BUFFER_SIZE,
               "%.*s",
               static_cast<int>(rest_length),
               flag_names);
      push_warning_printf(thd, MRN_SEVERITY_WARNING,
                          ER_MRN_INVALID_INDEX_FLAG_NUM,
                          ER_MRN_INVALID_INDEX_FLAG_STR,
                          invalid_flag_name);
      break;
    }
  }
  return found;
}

#ifdef MRN_HAVE_SPATIAL
static int mrn_set_geometry(grn_ctx *ctx, grn_obj *buf,
                            const char *wkb, uint wkb_size)
{
  int error = 0;
  Geometry_buffer buffer;
  Geometry *geometry;

  geometry = Geometry::construct(&buffer, wkb, wkb_size);
  if (!geometry) {
    return ER_CANT_CREATE_GEOMETRY_OBJECT;
  }
  switch (geometry->get_class_info()->m_type_id) {
  case Geometry::wkb_point:
    {
      Gis_point *point = (Gis_point *)geometry;
      double latitude = 0.0, longitude = 0.0;
#ifdef MRN_HAVE_POINT_XY
      point_xy xy(0.0, 0.0);
      point->get_xy(&xy);
      longitude = xy.x;
      latitude = xy.y;
#else
      point->get_xy(&longitude, &latitude);
#endif
      grn_obj_reinit(ctx, buf, GRN_DB_WGS84_GEO_POINT, 0);
      GRN_GEO_POINT_SET(ctx, buf,
                        GRN_GEO_DEGREE2MSEC(latitude),
                        GRN_GEO_DEGREE2MSEC(longitude));
      break;
    }
  default:
    my_printf_error(ER_MRN_GEOMETRY_NOT_SUPPORT_NUM,
      ER_MRN_GEOMETRY_NOT_SUPPORT_STR, MYF(0));
    error = ER_MRN_GEOMETRY_NOT_SUPPORT_NUM;
    break;
  }
  MRN_GEOMETRY_FREE(geometry);

  return error;
}
#endif

#ifdef MRN_HAVE_HTON_ALTER_TABLE_FLAGS
static alter_table_operations mrn_alter_table_flags(alter_table_operations flags)
{
  ulonglong alter_flags = 0;
#ifdef HA_INPLACE_ADD_INDEX_NO_READ_WRITE
  bool is_inplace_index_change;
#  ifdef MRN_HAVE_ALTER_INFO
  is_inplace_index_change = (((flags & ALTER_ADD_INDEX) &&
                              (flags & ALTER_DROP_INDEX)) ||
                             (flags & ALTER_CHANGE_COLUMN));
#  else
  is_inplace_index_change = (((flags & ALTER_ADD_INDEX) &&
                              (flags & ALTER_DROP_INDEX)) ||
                             (flags & ALTER_CHANGE_COLUMN));
#  endif
  if (!is_inplace_index_change) {
    alter_flags |=
      HA_INPLACE_ADD_INDEX_NO_READ_WRITE |
      HA_INPLACE_DROP_INDEX_NO_READ_WRITE |
      HA_INPLACE_ADD_UNIQUE_INDEX_NO_READ_WRITE |
      HA_INPLACE_DROP_UNIQUE_INDEX_NO_READ_WRITE |
      HA_INPLACE_ADD_INDEX_NO_WRITE |
      HA_INPLACE_DROP_INDEX_NO_WRITE |
      HA_INPLACE_ADD_UNIQUE_INDEX_NO_WRITE |
      HA_INPLACE_DROP_UNIQUE_INDEX_NO_WRITE;
  }
#endif
  return alter_flags;
}
#endif

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
static ha_create_table_option mrn_field_options[] =
{
  HA_FOPTION_STRING("GROONGA_TYPE", groonga_type),
  HA_FOPTION_STRING("FLAGS", flags),
  HA_FOPTION_END
};

static ha_create_table_option mrn_index_options[] =
{
  HA_IOPTION_STRING("TOKENIZER", tokenizer),
  HA_IOPTION_STRING("NORMALIZER", normalizer),
  HA_IOPTION_STRING("TOKEN_FILTERS", token_filters),
  HA_IOPTION_STRING("FLAGS", flags),
  HA_IOPTION_END
};
#endif

static int mrn_init(void *p)
{
  // init handlerton
  grn_ctx *ctx = NULL;
  handlerton *hton = static_cast<handlerton *>(p);
  hton->create = mrn_handler_create;
  hton->flags = HTON_NO_FLAGS;
#ifndef MRN_SUPPORT_PARTITION
  hton->flags |= HTON_NO_PARTITION;
#endif
  hton->drop_database = mrn_drop_database;
  hton->close_connection = mrn_close_connection;
  hton->flush_logs = mrn_flush_logs;
#ifdef MRN_HAVE_HTON_ALTER_TABLE_FLAGS
  hton->alter_table_flags = mrn_alter_table_flags;
#endif
#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  hton->field_options = mrn_field_options;
  hton->index_options = mrn_index_options;
#endif
  mrn_hton_ptr = hton;

#ifdef _WIN32
  HMODULE current_module = GetModuleHandle(NULL);
  mrn_binlog_filter =
    *((Rpl_filter **)GetProcAddress(current_module, MRN_BINLOG_FILTER_PROC));
  mrn_my_tz_UTC =
    *((Time_zone **)GetProcAddress(current_module, MRN_MY_TZ_UTC_PROC));
#  ifdef MRN_HAVE_TABLE_DEF_CACHE
  mrn_table_def_cache = (HASH *)GetProcAddress(current_module,
    "?table_def_cache@@3Ust_hash@@A");
#  endif
#  ifndef MRN_HAVE_TDC_LOCK_TABLE_SHARE
  mrn_LOCK_open =
    (mysql_mutex_t *)GetProcAddress(current_module,
      "?LOCK_open@@3Ust_mysql_mutex@@A");
#  endif
#  ifdef HAVE_PSI_INTERFACE
#    ifdef MRN_TABLE_SHARE_HAVE_LOCK_SHARE
       mrn_table_share_lock_share =
         (PSI_mutex_key *)GetProcAddress(current_module,
                                         MRN_TABLE_SHARE_LOCK_SHARE_PROC);
#    endif
     mrn_table_share_lock_ha_data =
       (PSI_mutex_key *)GetProcAddress(current_module,
                                       MRN_TABLE_SHARE_LOCK_HA_DATA_PROC);
#  endif
#else
  mrn_binlog_filter = binlog_filter;
  mrn_my_tz_UTC = my_tz_UTC;
#  ifdef MRN_HAVE_TABLE_DEF_CACHE
  mrn_table_def_cache = &table_def_cache;
#  endif
#  ifndef MRN_HAVE_TDC_LOCK_TABLE_SHARE
  mrn_LOCK_open = &LOCK_open;
#  endif
#endif

#ifdef MRN_HAVE_PSI_SERVER
  if (PSI_server) {
    const char *category = "mroonga";
    int n_mutexes = array_elements(mrn_mutexes);
    PSI_server->register_mutex(category, mrn_mutexes, n_mutexes);
  }
#endif

  grn_default_query_logger_set_path(mrn_query_log_file_path);

  if (grn_init() != GRN_SUCCESS) {
    goto err_grn_init;
  }

  grn_set_lock_timeout(mrn_lock_timeout);

  mrn_init_encoding_map();

  grn_ctx_init(&mrn_ctx, 0);
  ctx = &mrn_ctx;
  if (mrn_change_encoding(ctx, system_charset_info))
    goto err_mrn_change_encoding;

#ifdef MRN_HAVE_PSI_MEMORY_KEY
  {
    const char *category = "ha_mroonga";
    int n_keys = array_elements(mrn_all_memory_keys);
    mysql_memory_register(category, mrn_all_memory_keys, n_keys);
  }
#endif

  if (mysql_mutex_init(mrn_log_mutex_key,
                       &mrn_log_mutex,
                       MY_MUTEX_INIT_FAST) != 0) {
    goto err_log_mutex_init;
  }
  if (mysql_mutex_init(mrn_query_log_mutex_key,
                       &mrn_query_log_mutex,
                       MY_MUTEX_INIT_FAST) != 0) {
    goto err_query_log_mutex_init;
  }

  mrn_logger.max_level = static_cast<grn_log_level>(mrn_log_level);
  grn_logger_set(ctx, &mrn_logger);
  if (!(mrn_log_file = fopen(mrn_log_file_path, "a"))) {
    goto err_log_file_open;
  }
  mrn_log_file_opened = true;
  GRN_LOG(ctx, GRN_LOG_NOTICE, "%s started.", MRN_PACKAGE_STRING);
  GRN_LOG(ctx, GRN_LOG_NOTICE, "log level is '%s'",
          mrn_log_level_type_names[mrn_log_level]);

  // init meta-info database
  if (!(mrn_db = grn_db_create(ctx, NULL, NULL))) {
    GRN_LOG(ctx, GRN_LOG_ERROR, "cannot create system database, exiting");
    goto err_db_create;
  }
  grn_ctx_use(ctx, mrn_db);

  grn_ctx_init(&mrn_db_manager_ctx, 0);
  grn_logger_set(&mrn_db_manager_ctx, &mrn_logger);
  if (mysql_mutex_init(mrn_db_manager_mutex_key,
                       &mrn_db_manager_mutex,
                       MY_MUTEX_INIT_FAST) != 0) {
    GRN_LOG(&mrn_db_manager_ctx, GRN_LOG_ERROR,
            "failed to initialize mutex for database manager");
    goto err_db_manager_mutex_init;
  }
  mrn_db_manager = new mrn::DatabaseManager(&mrn_db_manager_ctx,
                                            &mrn_db_manager_mutex);
  if (!mrn_db_manager->init()) {
    goto err_db_manager_init;
  }

  if (mysql_mutex_init(mrn_context_pool_mutex_key,
                       &mrn_context_pool_mutex,
                       MY_MUTEX_INIT_FAST) != 0) {
    GRN_LOG(ctx, GRN_LOG_ERROR,
            "failed to initialize mutex for context pool");
    goto error_context_pool_mutex_init;
  }
  mrn_context_pool = new mrn::ContextPool(&mrn_context_pool_mutex);

  if (mysql_mutex_init(mrn_operations_mutex_key,
                       &mrn_operations_mutex,
                       MY_MUTEX_INIT_FAST) != 0) {
    GRN_LOG(ctx, GRN_LOG_ERROR,
            "failed to initialize mutex for operations");
    goto error_operations_mutex_init;
  }

  if ((mysql_mutex_init(mrn_allocated_thds_mutex_key,
                        &mrn_allocated_thds_mutex,
                        MY_MUTEX_INIT_FAST) != 0)) {
    goto err_allocated_thds_mutex_init;
  }
  if (mrn_my_hash_init(&mrn_allocated_thds,
                       &my_charset_bin,
                       32, 0, 0,
                       mrn_allocated_thds_get_key, 0, 0)) {
    goto error_allocated_thds_hash_init;
  }
  if ((mysql_mutex_init(mrn_open_tables_mutex_key,
                        &mrn_open_tables_mutex,
                        MY_MUTEX_INIT_FAST) != 0)) {
    goto err_allocated_open_tables_mutex_init;
  }
  if (mrn_my_hash_init(&mrn_open_tables,
                       Lex_ident_table::charset_info(),
                       32, 0, 0,
                       mrn_open_tables_get_key, 0, 0)) {
    goto error_allocated_open_tables_hash_init;
  }
  if ((mysql_mutex_init(mrn_long_term_share_mutex_key,
                        &mrn_long_term_share_mutex,
                        MY_MUTEX_INIT_FAST) != 0)) {
    goto error_allocated_long_term_share_mutex_init;
  }
  if (mrn_my_hash_init(&mrn_long_term_share,
                       Lex_ident_table::charset_info(),
                       32, 0, 0,
                       mrn_long_term_share_get_key, 0, 0)) {
    goto error_allocated_long_term_share_hash_init;
  }

#ifdef MRN_USE_MYSQL_DATA_HOME
  mrn::PathMapper::default_mysql_data_home_path = mysql_data_home;
#endif

  mrn_initialized = true;

  return 0;

error_allocated_long_term_share_hash_init:
  mysql_mutex_destroy(&mrn_long_term_share_mutex);
error_allocated_long_term_share_mutex_init:
  my_hash_free(&mrn_open_tables);
error_allocated_open_tables_hash_init:
  mysql_mutex_destroy(&mrn_open_tables_mutex);
err_allocated_open_tables_mutex_init:
  my_hash_free(&mrn_allocated_thds);
error_allocated_thds_hash_init:
  mysql_mutex_destroy(&mrn_allocated_thds_mutex);
err_allocated_thds_mutex_init:
  mysql_mutex_destroy(&mrn_operations_mutex);
error_operations_mutex_init:
  delete mrn_context_pool;
  mysql_mutex_destroy(&mrn_context_pool_mutex);
error_context_pool_mutex_init:
err_db_manager_init:
  delete mrn_db_manager;
  mysql_mutex_destroy(&mrn_db_manager_mutex);
err_db_manager_mutex_init:
  grn_ctx_fin(&mrn_db_manager_ctx);
  grn_obj_unlink(ctx, mrn_db);
err_db_create:
  if (mrn_log_file_opened) {
    fclose(mrn_log_file);
    mrn_log_file_opened = false;
  }
err_log_file_open:
  mysql_mutex_destroy(&mrn_query_log_mutex);
err_query_log_mutex_init:
  mysql_mutex_destroy(&mrn_log_mutex);
err_log_mutex_init:
err_mrn_change_encoding:
  grn_ctx_fin(ctx);
  grn_fin();
err_grn_init:
  return -1;
}

static int mrn_deinit(void *p)
{
  THD *thd = current_thd, *tmp_thd;
  grn_ctx *ctx = &mrn_ctx;
  MRN_LONG_TERM_SHARE *long_term_share;

  GRN_LOG(ctx, GRN_LOG_NOTICE, "%s deinit", MRN_PACKAGE_STRING);

  if (thd && thd_sql_command(thd) == SQLCOM_UNINSTALL_PLUGIN) {
    mrn::Lock lock(&mrn_allocated_thds_mutex);
    while ((tmp_thd = (THD *) my_hash_element(&mrn_allocated_thds, 0)))
    {
      mrn_clear_slot_data(tmp_thd);
      void *slot_ptr = mrn_get_slot_data(tmp_thd, false);
      if (slot_ptr) free(slot_ptr);
      thd_set_ha_data(tmp_thd, mrn_hton_ptr, 0);
      my_hash_delete(&mrn_allocated_thds, (uchar *) tmp_thd);
    }
  }

  {
    mrn::Lock lock(&mrn_open_tables_mutex);
    while ((long_term_share = (MRN_LONG_TERM_SHARE *)
      my_hash_element(&mrn_long_term_share, 0)))
    {
      mrn_free_long_term_share(long_term_share);
    }
  }

  my_hash_free(&mrn_long_term_share);
  mysql_mutex_destroy(&mrn_long_term_share_mutex);
  my_hash_free(&mrn_open_tables);
  mysql_mutex_destroy(&mrn_open_tables_mutex);
  my_hash_free(&mrn_allocated_thds);
  mysql_mutex_destroy(&mrn_allocated_thds_mutex);
  mysql_mutex_destroy(&mrn_operations_mutex);
  delete mrn_context_pool;
  mysql_mutex_destroy(&mrn_context_pool_mutex);
  delete mrn_db_manager;
  mysql_mutex_destroy(&mrn_db_manager_mutex);
  grn_ctx_fin(&mrn_db_manager_ctx);

  grn_obj_unlink(ctx, mrn_db);
  grn_ctx_fin(ctx);
  grn_fin();

  if (mrn_log_file_opened) {
    fclose(mrn_log_file);
    mrn_log_file_opened = false;
  }
  mysql_mutex_destroy(&mrn_query_log_mutex);
  mysql_mutex_destroy(&mrn_log_mutex);

  mrn_initialized = false;

  return 0;
}

mrn_declare_plugin(MRN_PLUGIN_NAME)
{
  MYSQL_STORAGE_ENGINE_PLUGIN,
  &storage_engine_structure,
  MRN_PLUGIN_NAME_STRING,
  MRN_PLUGIN_AUTHOR,
  "CJK-ready fulltext search, column store",
  PLUGIN_LICENSE_GPL,
  mrn_init,
  mrn_deinit,
  MRN_VERSION_IN_HEX,
  mrn_status_variables,
  mrn_system_variables,
  MRN_PLUGIN_LAST_VALUES
},
i_s_mrn_stats
mrn_declare_plugin_end;

static double mrn_get_score_value(grn_obj *score)
{
  MRN_DBUG_ENTER_FUNCTION();
  double score_value;
  if (score->header.domain == GRN_DB_FLOAT) {
    score_value = GRN_FLOAT_VALUE(score);
  } else {
    score_value = (double)GRN_INT32_VALUE(score);
  }
  DBUG_RETURN(score_value);
}

static void mrn_generic_ft_clear(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  st_mrn_ft_info *info = (st_mrn_ft_info *)handler;
  if (!info->ctx) {
    DBUG_VOID_RETURN;
  }

  if (info->cursor) {
    grn_obj_unlink(info->ctx, info->cursor);
  }
  if (info->id_accessor) {
    grn_obj_unlink(info->ctx, info->id_accessor);
  }
  if (info->key_accessor) {
    grn_obj_unlink(info->ctx, info->key_accessor);
  }
  grn_obj_unlink(info->ctx, info->result);
  grn_obj_unlink(info->ctx, info->score_column);
  grn_obj_unlink(info->ctx, &(info->key));
  grn_obj_unlink(info->ctx, &(info->score));

  info->ctx = NULL;

  DBUG_VOID_RETURN;
}

static void mrn_generic_ft_close_search(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  st_mrn_ft_info *info = (st_mrn_ft_info *)handler;
  mrn_generic_ft_clear(handler);
  delete info;
  DBUG_VOID_RETURN;
}

static int mrn_wrapper_ft_read_next(FT_INFO *handler, char *record)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_RETURN(HA_ERR_END_OF_FILE);
}

static float mrn_wrapper_ft_find_relevance(FT_INFO *handler, uchar *record,
                                           uint length)
{
  MRN_DBUG_ENTER_FUNCTION();
  st_mrn_ft_info *info = (st_mrn_ft_info *)handler;
  float score = 0.0;
  grn_id record_id;

  mrn_change_encoding(info->ctx, NULL);
  key_copy((uchar *)(GRN_TEXT_VALUE(&(info->key))), record,
           info->primary_key_info, info->primary_key_info->key_length);
  record_id = grn_table_get(info->ctx,
                            info->table,
                            GRN_TEXT_VALUE(&(info->key)),
                            GRN_TEXT_LEN(&(info->key)));

  if (record_id != GRN_ID_NIL) {
    grn_id result_record_id;
    result_record_id = grn_table_get(info->ctx, info->result,
                                     &record_id, sizeof(grn_id));
    if (result_record_id != GRN_ID_NIL) {
      GRN_BULK_REWIND(&(info->score));
      grn_obj_get_value(info->ctx, info->score_column,
                        result_record_id, &(info->score));
      score = mrn_get_score_value(&(info->score));
    }
  }

  DBUG_PRINT("info",
             ("mroonga: record_id=%d score=%g", record_id, score));

  DBUG_RETURN(score);
}

static void mrn_wrapper_ft_close_search(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  mrn_generic_ft_close_search(handler);
  DBUG_VOID_RETURN;
}

static float mrn_wrapper_ft_get_relevance(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  st_mrn_ft_info *info = (st_mrn_ft_info *)handler;
  float score = 0.0;
  grn_id record_id;
  ha_mroonga *mroonga = info->mroonga;
  mrn_change_encoding(info->ctx, NULL);
  record_id = grn_table_get(info->ctx,
                            info->table,
                            GRN_TEXT_VALUE(&(mroonga->key_buffer)),
                            GRN_TEXT_LEN(&(mroonga->key_buffer)));

  if (record_id != GRN_ID_NIL) {
    grn_id result_record_id;
    result_record_id = grn_table_get(info->ctx, info->result,
                                     &record_id, sizeof(grn_id));
    if (result_record_id != GRN_ID_NIL) {
      GRN_BULK_REWIND(&(info->score));
      grn_obj_get_value(info->ctx, info->score_column,
                        result_record_id, &(info->score));
      score = mrn_get_score_value(&(info->score));
    }
  }

  DBUG_PRINT("info",
             ("mroonga: record_id=%d score=%g", record_id, score));

  DBUG_RETURN(score);
}

static void mrn_wrapper_ft_reinit_search(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_VOID_RETURN;
}

static _ft_vft mrn_wrapper_ft_vft = {
  mrn_wrapper_ft_read_next,
  mrn_wrapper_ft_find_relevance,
  mrn_wrapper_ft_close_search,
  mrn_wrapper_ft_get_relevance,
  mrn_wrapper_ft_reinit_search
};

static int mrn_storage_ft_read_next(FT_INFO *handler, char *record)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_RETURN(HA_ERR_END_OF_FILE);
}

static float mrn_storage_ft_find_relevance(FT_INFO *handler, uchar *record,
                                           uint length)
{
  MRN_DBUG_ENTER_FUNCTION();
  st_mrn_ft_info *info = (st_mrn_ft_info *)handler;
  ha_mroonga *mroonga = info->mroonga;
  mrn_change_encoding(info->ctx, NULL);

  float score = 0.0;
  if (mroonga->record_id != GRN_ID_NIL) {
    grn_id result_record_id;
    result_record_id = grn_table_get(info->ctx, info->result,
                                     &(mroonga->record_id), sizeof(grn_id));
    if (result_record_id != GRN_ID_NIL) {
      GRN_BULK_REWIND(&(info->score));
      grn_obj_get_value(info->ctx, info->score_column,
                        result_record_id, &(info->score));
      score = mrn_get_score_value(&(info->score));
    }
  }
  DBUG_PRINT("info", ("mroonga: record_id=%d score=%g",
                      mroonga->record_id, score));

  DBUG_RETURN(score);
}

static void mrn_storage_ft_close_search(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  mrn_generic_ft_close_search(handler);
  DBUG_VOID_RETURN;
}

static float mrn_storage_ft_get_relevance(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  st_mrn_ft_info *info = (st_mrn_ft_info *)handler;
  ha_mroonga *mroonga = info->mroonga;
  mrn_change_encoding(info->ctx, NULL);

  float score = 0.0;
  if (mroonga->record_id != GRN_ID_NIL) {
    grn_id result_record_id;
    result_record_id = grn_table_get(info->ctx, info->result,
                                     &(mroonga->record_id), sizeof(grn_id));
    if (result_record_id != GRN_ID_NIL) {
      GRN_BULK_REWIND(&(info->score));
      grn_obj_get_value(info->ctx, info->score_column,
                        result_record_id, &(info->score));
      score = mrn_get_score_value(&(info->score));
    }
  }
  DBUG_PRINT("info",
             ("mroonga: record_id=%d score=%g", mroonga->record_id, score));

  DBUG_RETURN(score);
}

static void mrn_storage_ft_reinit_search(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_VOID_RETURN;
}

static _ft_vft mrn_storage_ft_vft = {
  mrn_storage_ft_read_next,
  mrn_storage_ft_find_relevance,
  mrn_storage_ft_close_search,
  mrn_storage_ft_get_relevance,
  mrn_storage_ft_reinit_search
};

static int mrn_no_such_key_ft_read_next(FT_INFO *handler, char *record)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_RETURN(HA_ERR_END_OF_FILE);
}

static float mrn_no_such_key_ft_find_relevance(FT_INFO *handler, uchar *record,
                                               uint length)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_RETURN(0.0);
}

static void mrn_no_such_key_ft_close_search(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  st_mrn_ft_info *info = (st_mrn_ft_info *)handler;
  delete info;
  DBUG_VOID_RETURN;
}

static float mrn_no_such_key_ft_get_relevance(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_RETURN(0.0);
}

static void mrn_no_such_key_ft_reinit_search(FT_INFO *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  DBUG_VOID_RETURN;
}

static _ft_vft mrn_no_such_key_ft_vft = {
  mrn_no_such_key_ft_read_next,
  mrn_no_such_key_ft_find_relevance,
  mrn_no_such_key_ft_close_search,
  mrn_no_such_key_ft_get_relevance,
  mrn_no_such_key_ft_reinit_search
};

#ifdef HA_CAN_FULLTEXT_EXT
static uint mrn_generic_ft_get_version()
{
  MRN_DBUG_ENTER_FUNCTION();
  // This value is not used in MySQL 5.6.7-rc. So it is
  // meaningless. It may be used in the future...
  uint version = 1;
  DBUG_RETURN(version);
}

static ulonglong mrn_generic_ft_ext_get_flags()
{
  MRN_DBUG_ENTER_FUNCTION();
  // TODO: Should we support FTS_ORDERED_RESULT?
  // TODO: Should we support FTS_DOCID_IN_RESULT?
  ulonglong flags = 0;
  DBUG_RETURN(flags);
}

// This function is used if we enable FTS_DOCID_IN_RESULT flag and the
// table has "FTS_DOC_ID" (defined as FTS_DOC_ID_COL_NAME macro)
// special name column. Should we support "FTS_DOC_ID" special name
// column?
// See also sql/sql_optimizer.cc:JOIN::optimize_fts_query().
static ulonglong mrn_generic_ft_ext_get_docid(FT_INFO_EXT *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong id = GRN_ID_NIL;
  DBUG_RETURN(id);
}

static ulonglong mrn_generic_ft_ext_count_matches(FT_INFO_EXT *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  st_mrn_ft_info *info = reinterpret_cast<st_mrn_ft_info *>(handler);
  ulonglong n_records = grn_table_size(info->ctx, info->result);
  DBUG_RETURN(n_records);
}

static uint mrn_wrapper_ft_ext_get_version()
{
  MRN_DBUG_ENTER_FUNCTION();
  uint version = mrn_generic_ft_get_version();
  DBUG_RETURN(version);
}

static ulonglong mrn_wrapper_ft_ext_get_flags()
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong flags = mrn_generic_ft_ext_get_flags();
  DBUG_RETURN(flags);
}

static ulonglong mrn_wrapper_ft_ext_get_docid(FT_INFO_EXT *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong id = mrn_generic_ft_ext_get_docid(handler);
  DBUG_RETURN(id);
}

static ulonglong mrn_wrapper_ft_ext_count_matches(FT_INFO_EXT *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong n_records = mrn_generic_ft_ext_count_matches(handler);
  DBUG_RETURN(n_records);
}

static _ft_vft_ext mrn_wrapper_ft_vft_ext = {
  mrn_wrapper_ft_ext_get_version,
  mrn_wrapper_ft_ext_get_flags,
  mrn_wrapper_ft_ext_get_docid,
  mrn_wrapper_ft_ext_count_matches
};

static uint mrn_storage_ft_ext_get_version()
{
  MRN_DBUG_ENTER_FUNCTION();
  uint version = mrn_generic_ft_get_version();
  DBUG_RETURN(version);
}

static ulonglong mrn_storage_ft_ext_get_flags()
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong flags = mrn_generic_ft_ext_get_flags();
  DBUG_RETURN(flags);
}

static ulonglong mrn_storage_ft_ext_get_docid(FT_INFO_EXT *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong id = mrn_generic_ft_ext_get_docid(handler);
  DBUG_RETURN(id);
}

static ulonglong mrn_storage_ft_ext_count_matches(FT_INFO_EXT *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong n_records = mrn_generic_ft_ext_count_matches(handler);
  DBUG_RETURN(n_records);
}

static _ft_vft_ext mrn_storage_ft_vft_ext = {
  mrn_storage_ft_ext_get_version,
  mrn_storage_ft_ext_get_flags,
  mrn_storage_ft_ext_get_docid,
  mrn_storage_ft_ext_count_matches
};

static uint mrn_no_such_key_ft_ext_get_version()
{
  MRN_DBUG_ENTER_FUNCTION();
  uint version = mrn_generic_ft_get_version();
  DBUG_RETURN(version);
}

static ulonglong mrn_no_such_key_ft_ext_get_flags()
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong flags = mrn_generic_ft_ext_get_flags();
  DBUG_RETURN(flags);
}

static ulonglong mrn_no_such_key_ft_ext_get_docid(FT_INFO_EXT *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong id = GRN_ID_NIL;
  DBUG_RETURN(id);
}

static ulonglong mrn_no_such_key_ft_ext_count_matches(FT_INFO_EXT *handler)
{
  MRN_DBUG_ENTER_FUNCTION();
  ulonglong n_records = 0;
  DBUG_RETURN(n_records);
}

static _ft_vft_ext mrn_no_such_key_ft_vft_ext = {
  mrn_no_such_key_ft_ext_get_version,
  mrn_no_such_key_ft_ext_get_flags,
  mrn_no_such_key_ft_ext_get_docid,
  mrn_no_such_key_ft_ext_count_matches
};
#endif

/* handler implementation */
ha_mroonga::ha_mroonga(handlerton *hton, TABLE_SHARE *share_arg)
  :handler(hton, share_arg),
   wrap_handler(NULL),
   is_clone(false),
   parent_for_clone(NULL),
   mem_root_for_clone(NULL),
   record_id(GRN_ID_NIL),
   key_id(NULL),
   del_key_id(NULL),

   wrap_ft_init_count(0),
   share(NULL),
   wrap_key_info(NULL),
   base_key_info(NULL),

   analyzed_for_create(false),
   wrap_handler_for_create(NULL),
#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
   hnd_add_index(NULL),
#endif
#ifdef MRN_HANDLER_HAVE_CHECK_IF_SUPPORTED_INPLACE_ALTER
   alter_key_info_buffer(NULL),
#else
   wrap_alter_key_info(NULL),
#endif
   mrn_lock_type(F_UNLCK),

   ctx_entity_(),
   ctx(&ctx_entity_),
   grn_table(NULL),
   grn_columns(NULL),
   grn_column_ranges(NULL),
   grn_index_tables(NULL),
   grn_index_columns(NULL),

   grn_source_column_geo(NULL),
   cursor_geo(NULL),
   cursor(NULL),
   index_table_cursor(NULL),
   empty_value_records(NULL),
   empty_value_records_cursor(NULL),

   sorted_result(NULL),
   matched_record_keys(NULL),
   blob_buffers(NULL),

   dup_key(0),

   count_skip(false),
   fast_order_limit(false),
   fast_order_limit_with_index(false),

   ignoring_duplicated_key(false),
   inserting_with_update(false),
   fulltext_searching(false),
   ignoring_no_key_columns(false),
   replacing_(false),
   written_by_row_based_binlog(0),
   current_ft_item(NULL),
   operations_(NULL)
{
  MRN_DBUG_ENTER_METHOD();
  grn_ctx_init(ctx, 0);
  mrn_change_encoding(ctx, system_charset_info);
  grn_ctx_use(ctx, mrn_db);
  GRN_WGS84_GEO_POINT_INIT(&top_left_point, 0);
  GRN_WGS84_GEO_POINT_INIT(&bottom_right_point, 0);
  GRN_WGS84_GEO_POINT_INIT(&source_point, 0);
  GRN_TEXT_INIT(&key_buffer, 0);
  GRN_TEXT_INIT(&encoded_key_buffer, 0);
  GRN_VOID_INIT(&old_value_buffer);
  GRN_VOID_INIT(&new_value_buffer);
  DBUG_VOID_RETURN;
}

ha_mroonga::~ha_mroonga()
{
  MRN_DBUG_ENTER_METHOD();

  delete operations_;

  if (analyzed_for_create) {
    if (wrap_handler_for_create) {
      delete wrap_handler_for_create;
    }
    if (share_for_create.wrapper_mode) {
      plugin_unlock(NULL, share_for_create.plugin);
    }
    if (share_for_create.table_name) {
      my_free(share_for_create.table_name);
    }
    mrn_free_share_alloc(&share_for_create);
    free_root(&mem_root_for_create, MYF(0));
  }
  if (blob_buffers)
  {
    delete [] blob_buffers;
  }
  grn_obj_unlink(ctx, &top_left_point);
  grn_obj_unlink(ctx, &bottom_right_point);
  grn_obj_unlink(ctx, &source_point);
  grn_obj_unlink(ctx, &key_buffer);
  grn_obj_unlink(ctx, &encoded_key_buffer);
  grn_obj_unlink(ctx, &old_value_buffer);
  grn_obj_unlink(ctx, &new_value_buffer);
  grn_ctx_fin(ctx);
  DBUG_VOID_RETURN;
}

const char *ha_mroonga::table_type() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(MRN_PLUGIN_NAME_STRING);
}

const char *ha_mroonga::index_type(uint key_nr)
{
  MRN_DBUG_ENTER_METHOD();
  KEY *key_info = &(table->s->key_info[key_nr]);
  if (key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
    DBUG_RETURN("FULLTEXT");
  } else if (key_info->algorithm == HA_KEY_ALG_HASH) {
    DBUG_RETURN("HASH");
  } else {
    DBUG_RETURN("BTREE");
  }
}

static const char *ha_mroonga_exts[] = {
  NullS
};
const char **ha_mroonga::bas_ext() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(ha_mroonga_exts);
}

uint ha_mroonga::wrapper_max_supported_record_length() const
{
  uint res;
  MRN_DBUG_ENTER_METHOD();
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    res = wrap_handler_for_create->max_supported_record_length();
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    res = wrap_handler->max_supported_record_length();
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(res);
}

uint ha_mroonga::storage_max_supported_record_length() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(HA_MAX_REC_LENGTH);
}

uint ha_mroonga::max_supported_record_length() const
{
  MRN_DBUG_ENTER_METHOD();

  uint res;
  if (!share && !analyzed_for_create &&
    (
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_TABLE ||
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_INDEX ||
      thd_sql_command(ha_thd()) == SQLCOM_ALTER_TABLE
    )
  ) {
    create_share_for_create();
  }
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    res = wrapper_max_supported_record_length();
  } else if (wrap_handler && share && share->wrapper_mode) {
    res = wrapper_max_supported_record_length();
  } else {
    res = storage_max_supported_record_length();
  }

  DBUG_RETURN(res);
}

uint ha_mroonga::wrapper_max_supported_keys() const
{
  uint res;
  MRN_DBUG_ENTER_METHOD();
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    res = wrap_handler_for_create->max_supported_keys();
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    res = wrap_handler->max_supported_keys();
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(res);
}

uint ha_mroonga::storage_max_supported_keys() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(HA_MAX_REC_LENGTH);
}

uint ha_mroonga::max_supported_keys() const
{
  MRN_DBUG_ENTER_METHOD();

  uint res;
  if (!share && !analyzed_for_create &&
    (
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_TABLE ||
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_INDEX ||
      thd_sql_command(ha_thd()) == SQLCOM_ALTER_TABLE
    )
  ) {
    create_share_for_create();
  }
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    res = wrapper_max_supported_keys();
  } else if (wrap_handler && share && share->wrapper_mode) {
    res = wrapper_max_supported_keys();
  } else {
    res = storage_max_supported_keys();
  }

  DBUG_RETURN(res);
}

uint ha_mroonga::wrapper_max_supported_key_length() const
{
  uint res;
  MRN_DBUG_ENTER_METHOD();
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    res = wrap_handler_for_create->max_supported_key_length();
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    res = wrap_handler->max_supported_key_length();
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(res);
}

uint ha_mroonga::storage_max_supported_key_length() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(GRN_TABLE_MAX_KEY_SIZE);
}

uint ha_mroonga::max_supported_key_length() const
{
  MRN_DBUG_ENTER_METHOD();

  uint res;
  if (!share && !analyzed_for_create &&
    (
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_TABLE ||
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_INDEX ||
      thd_sql_command(ha_thd()) == SQLCOM_ALTER_TABLE
    )
  ) {
    create_share_for_create();
  }
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    res = wrapper_max_supported_key_length();
  } else if (wrap_handler && share && share->wrapper_mode) {
    res = wrapper_max_supported_key_length();
  } else {
    res = storage_max_supported_key_length();
  }

  DBUG_RETURN(res);
}

uint ha_mroonga::wrapper_max_supported_key_part_length() const
{
  uint res;
  MRN_DBUG_ENTER_METHOD();
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    res = wrap_handler_for_create->max_supported_key_part_length();
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    res = wrap_handler->max_supported_key_part_length();
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(res);
}

uint ha_mroonga::storage_max_supported_key_part_length() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(GRN_TABLE_MAX_KEY_SIZE);
}

uint ha_mroonga::max_supported_key_part_length() const
{
  MRN_DBUG_ENTER_METHOD();

  uint res;
  if (!share && !analyzed_for_create &&
    (
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_TABLE ||
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_INDEX ||
      thd_sql_command(ha_thd()) == SQLCOM_ALTER_TABLE
    )
  ) {
    create_share_for_create();
  }
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    res = wrapper_max_supported_key_part_length();
  } else if (wrap_handler && share && share->wrapper_mode) {
    res = wrapper_max_supported_key_part_length();
  } else {
    res = storage_max_supported_key_part_length();
  }

  DBUG_RETURN(res);
}

ulonglong ha_mroonga::wrapper_table_flags() const
{
  ulonglong table_flags;
  MRN_DBUG_ENTER_METHOD();
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    table_flags = wrap_handler_for_create->ha_table_flags();
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    table_flags = wrap_handler->ha_table_flags();
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  table_flags |= HA_CAN_FULLTEXT | HA_PRIMARY_KEY_REQUIRED_FOR_DELETE |
    HA_CAN_RTREEKEYS | HA_REC_NOT_IN_SEQ;
#ifdef HA_CAN_REPAIR
  table_flags |= HA_CAN_REPAIR;
#endif
#ifdef HA_CAN_FULLTEXT_EXT
  table_flags |= HA_CAN_FULLTEXT_EXT;
#endif
#ifdef HA_GENERATED_COLUMNS
  table_flags |= HA_GENERATED_COLUMNS;
#endif
#ifdef HA_CAN_VIRTUAL_COLUMNS
  table_flags |= HA_CAN_VIRTUAL_COLUMNS;
#endif
  table_flags |= HA_CAN_HASH_KEYS;
  DBUG_RETURN(table_flags);
}

ulonglong ha_mroonga::storage_table_flags() const
{
  MRN_DBUG_ENTER_METHOD();
  ulonglong flags =
    HA_NO_TRANSACTIONS |
    HA_PARTIAL_COLUMN_READ |
    HA_REC_NOT_IN_SEQ |
    HA_NULL_IN_KEY |
    HA_CAN_INDEX_BLOBS |
    HA_STATS_RECORDS_IS_EXACT |
    HA_CAN_FULLTEXT |
    HA_BINLOG_FLAGS |
    HA_CAN_BIT_FIELD |
    HA_DUPLICATE_POS |
    HA_CAN_GEOMETRY |
    HA_CAN_RTREEKEYS;
    //HA_HAS_RECORDS;
#ifdef HA_MUST_USE_TABLE_CONDITION_PUSHDOWN
  flags |= HA_MUST_USE_TABLE_CONDITION_PUSHDOWN;
#endif
#ifdef HA_CAN_REPAIR
  flags |= HA_CAN_REPAIR;
#endif
#ifdef HA_CAN_FULLTEXT_EXT
  flags |= HA_CAN_FULLTEXT_EXT;
#endif
#ifdef HA_GENERATED_COLUMNS
  flags |= HA_GENERATED_COLUMNS;
#endif
#ifdef HA_CAN_VIRTUAL_COLUMNS
  flags |= HA_CAN_VIRTUAL_COLUMNS;
#endif
  flags |= HA_CAN_HASH_KEYS;
  DBUG_RETURN(flags);
}

ulonglong ha_mroonga::table_flags() const
{
  MRN_DBUG_ENTER_METHOD();

  ulonglong flags;
  if (!share && !analyzed_for_create &&
    (
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_TABLE ||
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_INDEX ||
      thd_sql_command(ha_thd()) == SQLCOM_ALTER_TABLE
    )
  ) {
    create_share_for_create();
  }
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    flags = wrapper_table_flags();
  } else if (wrap_handler && share && share->wrapper_mode) {
    flags = wrapper_table_flags();
  } else {
    flags = storage_table_flags();
  }

  DBUG_RETURN(flags);
}

ulong ha_mroonga::wrapper_index_flags(uint idx, uint part, bool all_parts) const
{
  ulong index_flags;
  KEY *key = &(table_share->key_info[idx]);
  MRN_DBUG_ENTER_METHOD();
  if (key->algorithm == HA_KEY_ALG_BTREE ||
      key->algorithm == HA_KEY_ALG_UNDEF) {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    index_flags = wrap_handler->index_flags(idx, part, all_parts);
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  } else {
    index_flags = HA_ONLY_WHOLE_INDEX | HA_KEY_SCAN_NOT_ROR;
  }
  DBUG_RETURN(index_flags);
}

ulong ha_mroonga::storage_index_flags(uint idx, uint part, bool all_parts) const
{
  MRN_DBUG_ENTER_METHOD();
  ulong flags;
  KEY *key = &(table_share->key_info[idx]);
  if (key->algorithm == HA_KEY_ALG_BTREE ||
      key->algorithm == HA_KEY_ALG_UNDEF) {
    flags = HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE;
    bool need_normalize_p = false;
    // TODO: MariaDB 10.1 passes key->user_defined_key_parts as part
    // for ORDER BY DESC. We just it fallback to part = 0. We may use
    // it for optimization in the future.
    //
    // See also: test_if_order_by_key() in sql/sql_select.cc.
    if (KEY_N_KEY_PARTS(key) == part) {
      part = 0;
    }
    Field *field = &(key->key_part[part].field[0]);
    if (field && (have_custom_normalizer(key) || should_normalize(field))) {
      need_normalize_p = true;
    }
    if (!need_normalize_p) {
      flags |= HA_KEYREAD_ONLY;
    }
    if (KEY_N_KEY_PARTS(key) > 1 || !need_normalize_p) {
      flags |= HA_READ_ORDER;
    }
  } else {
    flags = HA_ONLY_WHOLE_INDEX | HA_KEY_SCAN_NOT_ROR;
  }
  DBUG_RETURN(flags);
}

ulong ha_mroonga::index_flags(uint idx, uint part, bool all_parts) const
{
  MRN_DBUG_ENTER_METHOD();

  KEY *key = &(table_share->key_info[idx]);
  if (key->algorithm == HA_KEY_ALG_FULLTEXT) {
    DBUG_RETURN(HA_ONLY_WHOLE_INDEX | HA_KEY_SCAN_NOT_ROR);
  }
  if (mrn_is_geo_key(key)) {
    DBUG_RETURN(HA_ONLY_WHOLE_INDEX | HA_KEY_SCAN_NOT_ROR | HA_READ_RANGE);
  }

  int error = 0;
  if (wrap_handler && share && share->wrapper_mode)
  {
    error = wrapper_index_flags(idx, part, all_parts);
  } else {
    error = storage_index_flags(idx, part, all_parts);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::create_share_for_create() const
{
  int error;
  THD *thd = ha_thd();
  LEX *lex = thd->lex;
  HA_CREATE_INFO *create_info = &lex->create_info;
  TABLE_LIST *table_list = MRN_LEX_GET_TABLE_LIST(lex);
  MRN_DBUG_ENTER_METHOD();
  wrap_handler_for_create = NULL;
  table_for_create.reset();
  table_share_for_create.reset();
  memset(&share_for_create, 0, sizeof(MRN_SHARE));
  if (table_share) {
    table_share_for_create.comment = table_share->comment;
  } else {
#ifdef MRN_HANDLER_HAVE_CHECK_IF_SUPPORTED_INPLACE_ALTER
    if (thd_sql_command(ha_thd()) != SQLCOM_CREATE_INDEX) {
#endif
      table_share_for_create.comment = create_info->comment;
#ifdef MRN_HANDLER_HAVE_CHECK_IF_SUPPORTED_INPLACE_ALTER
    }
#endif
    if (thd_sql_command(ha_thd()) == SQLCOM_ALTER_TABLE ||
        thd_sql_command(ha_thd()) == SQLCOM_CREATE_INDEX) {
      st_mrn_slot_data *slot_data = mrn_get_slot_data(thd, false);
      if (slot_data && slot_data->alter_create_info) {
        create_info = slot_data->alter_create_info;
        if (slot_data->alter_comment) {
          table_share_for_create.comment.str =
            slot_data->alter_comment;
          table_share_for_create.comment.length =
            strlen(slot_data->alter_comment);
        } else {
          table_share_for_create.comment.str = NULL;
          table_share_for_create.comment.length = 0;
        }
      }
    }
  }
  mrn_init_alloc_root(&mem_root_for_create, 1024, 0, MYF(0));
  analyzed_for_create = true;
  if (table_list) {
    share_for_create.table_name = mrn_my_strndup(table_list->table_name.str,
                                                 table_list->table_name.length,
                                                 MYF(MY_WME));
    share_for_create.table_name_length = table_list->table_name.length;
  }
  share_for_create.table_share = &table_share_for_create;
  table_for_create.s = &table_share_for_create;
#ifdef WITH_PARTITION_STORAGE_ENGINE
  table_for_create.part_info = NULL;
#endif
  if ((error = mrn_parse_table_param(&share_for_create, &table_for_create)))
    goto error;

  if (share_for_create.wrapper_mode)
  {
    wrap_handler_for_create =
      share_for_create.hton->create(share_for_create.hton, NULL,
                                    &mem_root_for_create);
    if (!wrap_handler_for_create) {
      error = HA_ERR_OUT_OF_MEM;
      goto error;
    }
    wrap_handler_for_create->init();
  }
  DBUG_RETURN(0);

error:
  if (share_for_create.wrapper_mode) {
    plugin_unlock(NULL, share_for_create.plugin);
  }
  mrn_free_share_alloc(&share_for_create);
  free_root(&mem_root_for_create, MYF(0));
  analyzed_for_create = false;
  thd->clear_error();
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_create(const char *name, TABLE *table,
                               HA_CREATE_INFO *info, MRN_SHARE *tmp_share)
{
  int error = 0;
  handler *hnd;
  MRN_DBUG_ENTER_METHOD();

  if (table_share->primary_key == MAX_KEY)
  {
    my_message(ER_REQUIRES_PRIMARY_KEY,
               MRN_GET_ERR_MSG(ER_REQUIRES_PRIMARY_KEY), MYF(0));
    DBUG_RETURN(ER_REQUIRES_PRIMARY_KEY);
  }

  error = ensure_database_open(name);
  if (error)
    DBUG_RETURN(error);

  error = wrapper_create_index(name, table, tmp_share);
  if (error)
    DBUG_RETURN(error);

  wrap_key_info = mrn_create_key_info_for_table(tmp_share, table, &error);
  if (error)
    DBUG_RETURN(error);
  base_key_info = table->key_info;

  share = tmp_share;
  MRN_SET_WRAP_SHARE_KEY(tmp_share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  if (parse_engine_table_options(ha_thd(), tmp_share->hton, table->s)) {
    MRN_SET_BASE_SHARE_KEY(tmp_share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
    share = NULL;
    if (wrap_key_info)
    {
      my_free(wrap_key_info);
      wrap_key_info = NULL;
    }
    base_key_info = NULL;
    error = MRN_GET_ERROR_NUMBER;
    DBUG_RETURN(error);
  }
#endif
  hnd = get_new_handler(table->s, current_thd->mem_root, tmp_share->hton);
  if (!hnd)
  {
    MRN_SET_BASE_SHARE_KEY(tmp_share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
    share = NULL;
    if (wrap_key_info)
    {
      my_free(wrap_key_info);
      wrap_key_info = NULL;
    }
    base_key_info = NULL;
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
  }
  info->option_struct= table->s->option_struct_table;
  error = hnd->ha_create(name, table, info);
  MRN_SET_BASE_SHARE_KEY(tmp_share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  share = NULL;
  delete hnd;

  if (error) {
    mrn::PathMapper mapper(name);
    generic_delete_table(name, mapper.table_name());
  }

  if (wrap_key_info)
  {
    my_free(wrap_key_info);
    wrap_key_info = NULL;
  }
  base_key_info = NULL;
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_create_index_fulltext_validate(KEY *key_info)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;
  uint i;
  for (i = 0; i < KEY_N_KEY_PARTS(key_info); i++) {
    Field *field = key_info->key_part[i].field;

    grn_builtin_type gtype = mrn_grn_type_from_field(ctx, field, true);
    if (gtype != GRN_DB_SHORT_TEXT)
    {
      error = ER_CANT_CREATE_TABLE;
      GRN_LOG(ctx, GRN_LOG_ERROR,
              "key type must be text: <%d> "
              "(TODO: We should show type name not type ID.)",
              field->type());
      my_message(ER_CANT_CREATE_TABLE,
                 "key type must be text. (TODO: We should show type name.)",
                 MYF(0));
      DBUG_RETURN(error);
    }
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_create_index_fulltext(const char *grn_table_name,
                                              int i,
                                              KEY *key_info,
                                              grn_obj **index_tables,
                                              grn_obj **index_columns,
                                              MRN_SHARE *tmp_share)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  error = wrapper_create_index_fulltext_validate(key_info);
  if (error) {
    DBUG_RETURN(error);
  }

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  grn_obj_flags index_table_flags =
    GRN_OBJ_TABLE_PAT_KEY |
    GRN_OBJ_PERSISTENT;
  grn_obj *index_table;

  grn_column_flags index_column_flags = GRN_OBJ_COLUMN_INDEX | GRN_OBJ_PERSISTENT;

  if (!find_index_column_flags(key_info, &index_column_flags)) {
    index_column_flags |= GRN_OBJ_WITH_POSITION;
    if (KEY_N_KEY_PARTS(key_info) > 1) {
      index_column_flags |= GRN_OBJ_WITH_SECTION;
    }
  }

  mrn::SmartGrnObj lexicon_key_type(ctx, GRN_DB_SHORT_TEXT);
  error = mrn_change_encoding(ctx, key_info->key_part->field->charset());
  if (error) {
    DBUG_RETURN(error);
  }
  mrn::IndexTableName index_table_name(grn_table_name, key_info->name.str);
  index_table = grn_table_create(ctx,
                                 index_table_name.c_str(),
                                 index_table_name.length(),
                                 NULL,
                                 index_table_flags,
                                 lexicon_key_type.get(),
                                 0);
  if (ctx->rc) {
    error = ER_CANT_CREATE_TABLE;
    my_message(ER_CANT_CREATE_TABLE, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  mrn_change_encoding(ctx, system_charset_info);
  index_tables[i] = index_table;

  grn_obj *tokenizer = find_tokenizer(key_info, tmp_share, i);
  if (tokenizer) {
    grn_info_type info_type = GRN_INFO_DEFAULT_TOKENIZER;
    grn_obj_set_info(ctx, index_table, info_type, tokenizer);
    grn_obj_unlink(ctx, tokenizer);
  }

  {
    grn_obj token_filters;
    GRN_PTR_INIT(&token_filters, GRN_OBJ_VECTOR, 0);
    if (find_token_filters(key_info, &token_filters)) {
      grn_obj_set_info(ctx, index_table,
                       GRN_INFO_TOKEN_FILTERS, &token_filters);
    }
    grn_obj_unlink(ctx, &token_filters);
  }

  if (have_custom_normalizer(key_info) ||
      should_normalize(&key_info->key_part->field[0])) {
    grn_info_type info_type = GRN_INFO_NORMALIZER;
    grn_obj *normalizer = find_normalizer(key_info);
    if (normalizer) {
      grn_obj_set_info(ctx, index_table, info_type, normalizer);
      grn_obj_unlink(ctx, normalizer);
    }
  }

  grn_obj *index_column = grn_column_create(ctx, index_table,
                                            INDEX_COLUMN_NAME,
                                            strlen(INDEX_COLUMN_NAME),
                                            NULL,
                                            index_column_flags,
                                            grn_table);
  if (ctx->rc) {
    error = ER_CANT_CREATE_TABLE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  if (index_columns) {
    index_columns[i] = index_column;
  } else {
    grn_obj_unlink(ctx, index_column);
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_create_index_geo(const char *grn_table_name,
                                         int i,
                                         KEY *key_info,
                                         grn_obj **index_tables,
                                         grn_obj **index_columns,
                                         MRN_SHARE *tmp_share)
{
  MRN_DBUG_ENTER_METHOD();
  int error;

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  mrn::IndexTableName index_table_name(grn_table_name, key_info->name.str);

  grn_obj_flags index_table_flags =
    GRN_OBJ_TABLE_PAT_KEY |
    GRN_OBJ_PERSISTENT;
  grn_obj *index_table;

  grn_obj_flags index_column_flags =
    GRN_OBJ_COLUMN_INDEX | GRN_OBJ_PERSISTENT;

  grn_obj *lexicon_key_type = grn_ctx_at(ctx, GRN_DB_WGS84_GEO_POINT);
  index_table = grn_table_create(ctx,
                                 index_table_name.c_str(),
                                 index_table_name.length(),
                                 NULL,
                                 index_table_flags, lexicon_key_type, 0);
  if (ctx->rc) {
    error = ER_CANT_CREATE_TABLE;
    my_message(ER_CANT_CREATE_TABLE, ctx->errbuf, MYF(0));
    grn_obj_unlink(ctx, lexicon_key_type);
    DBUG_RETURN(error);
  }
  grn_obj_unlink(ctx, lexicon_key_type);
  index_tables[i] = index_table;

  grn_obj *index_column = grn_column_create(ctx, index_table,
                                            INDEX_COLUMN_NAME,
                                            strlen(INDEX_COLUMN_NAME),
                                            NULL,
                                            index_column_flags,
                                            grn_table);
  if (ctx->rc) {
    error = ER_CANT_CREATE_TABLE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  if (index_columns) {
    index_columns[i] = index_column;
  } else {
    grn_obj_unlink(ctx, index_column);
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_create_index(const char *name, TABLE *table,
                                     MRN_SHARE *tmp_share)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;
  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  grn_obj *grn_index_table;
  mrn::PathMapper mapper(name);
  const char *grn_table_name = mapper.table_name();
  char *grn_table_path = NULL;     // we don't specify path
  grn_obj *pkey_type = grn_ctx_at(ctx, GRN_DB_SHORT_TEXT);
  grn_obj *pkey_value_type = NULL; // we don't use this
  grn_obj_flags grn_table_flags = GRN_OBJ_PERSISTENT | GRN_OBJ_TABLE_HASH_KEY;

  grn_index_table = grn_table_create(ctx, grn_table_name, strlen(grn_table_name),
                                     grn_table_path, grn_table_flags,
                                     pkey_type, pkey_value_type);
  if (ctx->rc) {
    error = ER_CANT_CREATE_TABLE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  if (grn_table) {
    grn_obj_unlink(ctx, grn_table);
  }
  grn_table = grn_index_table;

  uint i;
  uint n_keys = table->s->keys;
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_tables, n_keys);
  if (!tmp_share->disable_keys) {
    for (i = 0; i < n_keys; i++) {
      index_tables[i] = NULL;

      KEY *key_info = &(table->s->key_info[i]);
      if (key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
        error = wrapper_create_index_fulltext(grn_table_name,
                                              i, key_info,
                                              index_tables, NULL, tmp_share);
      } else if (mrn_is_geo_key(key_info)) {
        error = wrapper_create_index_geo(grn_table_name,
                                         i, key_info,
                                         index_tables, NULL, tmp_share);
      }
    }

    if (error) {
      for (uint j = 0; j < i; j++) {
        if (index_tables[j]) {
          grn_obj_remove(ctx, index_tables[j]);
        }
      }
      grn_obj_remove(ctx, grn_table);
      grn_table = NULL;
    }
  }
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_create(const char *name, TABLE *table,
                               HA_CREATE_INFO *info, MRN_SHARE *tmp_share)
{
  int error;
  MRN_LONG_TERM_SHARE *long_term_share = tmp_share->long_term_share;
  MRN_DBUG_ENTER_METHOD();

  if (info->auto_increment_value) {
    mrn::Lock lock(&long_term_share->auto_inc_mutex);
    long_term_share->auto_inc_value = info->auto_increment_value;
    DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
      long_term_share->auto_inc_value));
    long_term_share->auto_inc_inited = true;
  }

  error = storage_create_validate_pseudo_column(table);
  if (error)
    DBUG_RETURN(error);

  error = storage_create_validate_index(table);
  if (error)
    DBUG_RETURN(error);

  error = ensure_database_open(name);
  if (error)
    DBUG_RETURN(error);

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  grn_obj_flags table_flags = GRN_OBJ_PERSISTENT;

  /* primary key must be handled before creating table */
  grn_obj *pkey_type;
  uint pkey_nr = table->s->primary_key;
  if (pkey_nr != MAX_INDEXES) {
    KEY *key_info = &(table->s->key_info[pkey_nr]);
    bool is_id;

    int key_parts = KEY_N_KEY_PARTS(key_info);
    if (key_parts == 1) {
      Field *pkey_field = key_info->key_part[0].field;
      const char *column_name = pkey_field->field_name.str;
      is_id = (strcmp(MRN_COLUMN_NAME_ID, column_name) == 0);

      grn_builtin_type gtype = mrn_grn_type_from_field(ctx, pkey_field, false);
      pkey_type = grn_ctx_at(ctx, gtype);
    } else {
      is_id = false;
      pkey_type = grn_ctx_at(ctx, GRN_DB_SHORT_TEXT);
    }

    // default algorithm is BTREE ==> PAT
    if (!is_id && key_info->algorithm == HA_KEY_ALG_HASH) {
      table_flags |= GRN_OBJ_TABLE_HASH_KEY;
    } else if (!is_id) {
      table_flags |= GRN_OBJ_TABLE_PAT_KEY;
    } else {
      // for _id
      table_flags |= GRN_OBJ_TABLE_NO_KEY;
      pkey_type = NULL;
    }

  } else {
    // primary key doesn't exists
    table_flags |= GRN_OBJ_TABLE_NO_KEY;
    pkey_type = NULL;
  }

  /* create table */
  grn_obj *table_obj;
  mrn::PathMapper mapper(name);

  char *table_path = NULL;           // we don't specify path
  grn_obj *pkey_value_type = NULL; // we don't use this

  table_obj = grn_table_create(ctx,
                               mapper.table_name(), strlen(mapper.table_name()),
                               table_path,
                               table_flags, pkey_type, pkey_value_type);
  if (ctx->rc) {
    error = ER_CANT_CREATE_TABLE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }

  if (table_flags == (GRN_OBJ_PERSISTENT | GRN_OBJ_TABLE_PAT_KEY) ||
      table_flags == (GRN_OBJ_PERSISTENT | GRN_OBJ_TABLE_HASH_KEY)) {
    KEY *key_info = &(table->s->key_info[pkey_nr]);
    int key_parts = KEY_N_KEY_PARTS(key_info);
    if (key_parts == 1) {
      grn_obj *normalizer = NULL;
      if (tmp_share->normalizer) {
        normalizer = grn_ctx_get(ctx,
                                 tmp_share->normalizer,
                                 tmp_share->normalizer_length);
      } else {
        Field *field = &(key_info->key_part->field[0]);
        if (should_normalize(field)) {
          normalizer = find_normalizer(key_info);
        }
      }
      if (normalizer) {
        grn_info_type info_type = GRN_INFO_NORMALIZER;
        grn_obj_set_info(ctx, table_obj, info_type, normalizer);
        grn_obj_unlink(ctx, normalizer);
      }
      if (tmp_share->default_tokenizer) {
        grn_obj *default_tokenizer =
          grn_ctx_get(ctx,
                      tmp_share->default_tokenizer,
                      tmp_share->default_tokenizer_length);
        if (default_tokenizer) {
          grn_info_type info_type = GRN_INFO_DEFAULT_TOKENIZER;
          grn_obj_set_info(ctx, table_obj, info_type, default_tokenizer);
          grn_obj_unlink(ctx, default_tokenizer);
        }
      }
      if (tmp_share->token_filters) {
        grn_obj token_filters;
        GRN_PTR_INIT(&token_filters, GRN_OBJ_VECTOR, 0);
        if (find_token_filters_fill(&token_filters,
                                    tmp_share->token_filters,
                                    tmp_share->token_filters_length)) {
          grn_obj_set_info(ctx, table_obj,
                           GRN_INFO_TOKEN_FILTERS, &token_filters);
        }
        grn_obj_unlink(ctx, &token_filters);
      }
    }
  }

  /* create columns */
  uint n_columns = table->s->fields;
  for (uint i = 0; i < n_columns; i++) {
    Field *field = table->s->field[i];
    mrn::ColumnName column_name(field->field_name);

    if (strcmp(MRN_COLUMN_NAME_ID, column_name.mysql_name()) == 0) {
      continue;
    }

#ifdef MRN_SUPPORT_FOREIGN_KEYS
    if (storage_create_foreign_key(table, mapper.table_name(), field, table_obj,
                                   error)) {
      continue;
    }
    if (error) {
      grn_obj_remove(ctx, table_obj);
      DBUG_RETURN(error);
    }
#endif

#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      continue;
    }
#endif

    grn_obj_flags col_flags = GRN_OBJ_PERSISTENT;
    if (!find_column_flags(field, tmp_share, i, &col_flags)) {
      col_flags |= GRN_OBJ_COLUMN_SCALAR;
    }

    grn_obj *col_type;
    {
      int column_type_error_code = ER_CANT_CREATE_TABLE;
      col_type = find_column_type(field, tmp_share, i, column_type_error_code);
      if (!col_type) {
        grn_obj_remove(ctx, table_obj);
        DBUG_RETURN(column_type_error_code);
      }
    }
    char *col_path = NULL; // we don't specify path

    grn_column_create(ctx, table_obj,
                      column_name.c_str(), column_name.length(),
                      col_path, col_flags, col_type);
    if (ctx->rc) {
      error = ER_CANT_CREATE_TABLE;
      my_message(error, ctx->errbuf, MYF(0));
      grn_obj_remove(ctx, table_obj);
      DBUG_RETURN(error);
    }
  }

  error = storage_create_indexes(table, mapper.table_name(), table_obj,
                                 tmp_share);
  if (error) {
    grn_obj_remove(ctx, table_obj);
    table_obj = NULL;
  }

  if (table_obj) {
    grn_obj_unlink(ctx, table_obj);
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_create_validate_pseudo_column(TABLE *table)
{
  int error = 0;
  uint i, n_columns;

  MRN_DBUG_ENTER_METHOD();
  n_columns = table->s->fields;
  for (i = 0; i < n_columns; i++) {
    Field *field = table->s->field[i];
    const char *column_name = field->field_name.str;
    if (strcmp(MRN_COLUMN_NAME_ID, column_name) == 0) {
      switch (field->type()) {
      case MYSQL_TYPE_TINY :
      case MYSQL_TYPE_SHORT :
      case MYSQL_TYPE_INT24 :
      case MYSQL_TYPE_LONG :
      case MYSQL_TYPE_LONGLONG :
        break;
      default:
        GRN_LOG(ctx, GRN_LOG_ERROR, "_id must be numeric data type");
        error = ER_CANT_CREATE_TABLE;
        my_message(error, "_id must be numeric data type", MYF(0));
        DBUG_RETURN(error);
      }
    }
  }

  DBUG_RETURN(error);
}

#ifdef MRN_SUPPORT_FOREIGN_KEYS
bool ha_mroonga::storage_create_foreign_key(TABLE *table,
                                            const char *grn_table_name,
                                            Field *field,
                                            grn_obj *table_obj, int &error)
{
  MRN_DBUG_ENTER_METHOD();
  LEX *lex = ha_thd()->lex;
  Alter_info *alter_info = &lex->alter_info;
  List_iterator<Key> key_iterator(alter_info->key_list);
  Key *key;
  IdentBuffer<NAME_LEN> ref_db_buff, ref_table_buff;
  while ((key = key_iterator++))
  {
    if (key->type != MRN_KEYTYPE_FOREIGN)
    {
      continue;
    }
    if (key->columns.elements > 1)
    {
      error = ER_CANT_CREATE_TABLE;
      my_message(error, "mroonga can't use FOREIGN_KEY with multiple columns",
        MYF(0));
      DBUG_RETURN(false);
    }
    List_iterator<Key_part_spec> key_part_col_iterator(key->columns);
    Key_part_spec *key_part_col = key_part_col_iterator++;
    LEX_CSTRING field_name = key_part_col->field_name;
    DBUG_PRINT("info", ("mroonga: field_name=%s", field_name.str));
    DBUG_PRINT("info", ("mroonga: field->field_name=%s", field->field_name.str));
    if (strcmp(field->field_name.str, field_name.str))
    {
      continue;
    }
    Foreign_key *fk = (Foreign_key *) key;
    List_iterator<Key_part_spec> key_part_ref_col_iterator(fk->ref_columns);
    Key_part_spec *key_part_ref_col = key_part_ref_col_iterator++;
    LEX_CSTRING ref_field_name = key_part_ref_col->field_name;
    DBUG_PRINT("info", ("mroonga: ref_field_name=%s", ref_field_name.str));
#ifdef MRN_FOREIGN_KEY_USE_CONST_STRING
    LEX_CSTRING ref_db_name = fk->ref_db;
#else
    LEX_STRING ref_db_name = fk->ref_db;
#endif
    DBUG_PRINT("info", ("mroonga: ref_db_name=%s", ref_db_name.str));
    if (ref_db_name.str && lower_case_table_names) {
      ref_db_name= ref_db_buff.copy_casedn(ref_db_name).to_lex_cstring();
      DBUG_PRINT("info", ("mroonga: casedn ref_db_name=%s", ref_db_name.str));
    }
#ifdef MRN_FOREIGN_KEY_USE_CONST_STRING
    LEX_CSTRING ref_table_name = fk->ref_table;
#else
    LEX_STRING ref_table_name = fk->ref_table;
#endif
    DBUG_PRINT("info", ("mroonga: ref_table_name=%s", ref_table_name.str));
    if (ref_table_name.str && lower_case_table_names) {
      ref_table_name= ref_table_buff.copy_casedn(ref_table_name).to_lex_cstring();
      DBUG_PRINT("info", ("mroonga: casedn ref_table_name=%s", ref_table_name.str));
    }
    if (ref_db_name.str && strcmp(table->s->db.str, ref_db_name.str))
    {
      error = ER_CANT_CREATE_TABLE;
      my_message(error,
        "mroonga can't use FOREIGN_KEY during different database tables",
        MYF(0));
      DBUG_RETURN(false);
    }

    grn_obj *column, *column_ref = NULL, *grn_table_ref = NULL;
    char ref_path[FN_REFLEN + 1];
    TABLE_LIST table_list;
    TABLE_SHARE *tmp_ref_table_share;
    if (!build_table_filename(ref_path, sizeof(ref_path) - 1,
                              table->s->db.str, ref_table_name.str, "", 0))
    {
      my_error(ER_WRONG_TABLE_NAME, MYF(0), ref_table_name.str);
      DBUG_RETURN(false);
    }

    DBUG_PRINT("info", ("mroonga: ref_path=%s", ref_path));
    error = mrn_change_encoding(ctx, system_charset_info);
    if (error)
      DBUG_RETURN(false);
    mrn::PathMapper mapper(ref_path);
    grn_table_ref = grn_ctx_get(ctx, mapper.table_name(),
                                strlen(mapper.table_name()));
    if (!grn_table_ref) {
      error = ER_CANT_CREATE_TABLE;
      char err_msg[MRN_BUFFER_SIZE];
      snprintf(err_msg, MRN_BUFFER_SIZE,
               "reference table [%s.%s] is not mroonga table",
               table->s->db.str, ref_table_name.str);
      my_message(error, err_msg, MYF(0));
      DBUG_RETURN(false);
    }

    LEX_CSTRING tmp_db_name=    { mapper.db_name(), strlen(mapper.db_name()) };
    LEX_CSTRING tmp_table_name= { mapper.mysql_table_name(), strlen(mapper.mysql_table_name()) };
    table_list.init_one_table(&tmp_db_name, &tmp_table_name, 0, TL_WRITE);
    mrn_open_mutex_lock(table->s);
    tmp_ref_table_share =
      mrn_create_tmp_table_share(&table_list, ref_path, &error);
    mrn_open_mutex_unlock(table->s);
    if (!tmp_ref_table_share) {
      grn_obj_unlink(ctx, grn_table_ref);
      error = ER_CANT_CREATE_TABLE;
      char err_msg[MRN_BUFFER_SIZE];
      snprintf(err_msg, MRN_BUFFER_SIZE,
               "reference table [%s.%s] is not found",
               table->s->db.str, ref_table_name.str);
      my_message(error, err_msg, MYF(0));
      DBUG_RETURN(false);
    }
    uint ref_pkey_nr = tmp_ref_table_share->primary_key;
    if (ref_pkey_nr == MAX_KEY) {
      mrn_open_mutex_lock(table->s);
      mrn_free_tmp_table_share(tmp_ref_table_share);
      mrn_open_mutex_unlock(table->s);
      grn_obj_unlink(ctx, grn_table_ref);
      error = ER_CANT_CREATE_TABLE;
      char err_msg[MRN_BUFFER_SIZE];
      snprintf(err_msg, MRN_BUFFER_SIZE,
               "reference table [%s.%s] has no primary key",
               table->s->db.str, ref_table_name.str);
      my_message(error, err_msg, MYF(0));
      DBUG_RETURN(false);
    }
    KEY *ref_key_info = &tmp_ref_table_share->key_info[ref_pkey_nr];
    uint ref_key_parts = KEY_N_KEY_PARTS(ref_key_info);
    if (ref_key_parts > 1) {
      mrn_open_mutex_lock(table->s);
      mrn_free_tmp_table_share(tmp_ref_table_share);
      mrn_open_mutex_unlock(table->s);
      grn_obj_unlink(ctx, grn_table_ref);
      error = ER_CANT_CREATE_TABLE;
      char err_msg[MRN_BUFFER_SIZE];
      snprintf(err_msg, MRN_BUFFER_SIZE,
               "reference table [%s.%s] primary key is multiple column",
               table->s->db.str, ref_table_name.str);
      my_message(error, err_msg, MYF(0));
      DBUG_RETURN(false);
    }
    Field *ref_field = &ref_key_info->key_part->field[0];
    if (strcmp(ref_field->field_name.str, ref_field_name.str)) {
      mrn_open_mutex_lock(table->s);
      mrn_free_tmp_table_share(tmp_ref_table_share);
      mrn_open_mutex_unlock(table->s);
      grn_obj_unlink(ctx, grn_table_ref);
      error = ER_CANT_CREATE_TABLE;
      char err_msg[MRN_BUFFER_SIZE];
      snprintf(err_msg, MRN_BUFFER_SIZE,
               "reference column [%s.%s.%s] is not used for primary key",
               table->s->db.str, ref_table_name.str, ref_field_name.str);
      my_message(error, err_msg, MYF(0));
      DBUG_RETURN(false);
    }
    mrn_open_mutex_lock(table->s);
    mrn_free_tmp_table_share(tmp_ref_table_share);
    mrn_open_mutex_unlock(table->s);
    grn_obj_flags col_flags = GRN_OBJ_PERSISTENT;
    column = grn_column_create(ctx, table_obj, field->field_name.str,
                               field->field_name.length,
                               NULL, col_flags, grn_table_ref);
    if (ctx->rc) {
      grn_obj_unlink(ctx, grn_table_ref);
      error = ER_CANT_CREATE_TABLE;
      my_message(error, ctx->errbuf, MYF(0));
      DBUG_RETURN(false);
    }

    mrn::IndexColumnName index_column_name(grn_table_name, field->field_name.str);
    grn_obj_flags ref_col_flags = GRN_OBJ_COLUMN_INDEX | GRN_OBJ_PERSISTENT;
    column_ref = grn_column_create(ctx, grn_table_ref,
                                   index_column_name.c_str(),
                                   index_column_name.length(),
                                   NULL, ref_col_flags, table_obj);
    if (ctx->rc) {
      grn_obj_unlink(ctx, column);
      grn_obj_unlink(ctx, grn_table_ref);
      error = ER_CANT_CREATE_TABLE;
      my_message(error, ctx->errbuf, MYF(0));
      DBUG_RETURN(false);
    }

    grn_obj source_ids;
    grn_id source_id = grn_obj_id(ctx, column);
    GRN_UINT32_INIT(&source_ids, GRN_OBJ_VECTOR);
    GRN_UINT32_PUT(ctx, &source_ids, source_id);
    if (error) {
      grn_obj_unlink(ctx, &source_ids);
      grn_obj_unlink(ctx, column_ref);
      grn_obj_unlink(ctx, column);
      grn_obj_unlink(ctx, grn_table_ref);
      DBUG_RETURN(false);
    }
    grn_obj_set_info(ctx, column_ref, GRN_INFO_SOURCE, &source_ids);
    grn_obj_unlink(ctx, &source_ids);
    grn_obj_unlink(ctx, column_ref);
    grn_obj_unlink(ctx, column);
    grn_obj_unlink(ctx, grn_table_ref);
    error = 0;
    DBUG_RETURN(true);
  }
  error = 0;
  DBUG_RETURN(false);
}
#endif

int ha_mroonga::storage_create_validate_index(TABLE *table)
{
  int error = 0;
  uint i;

  MRN_DBUG_ENTER_METHOD();
  /* checking if index is used for virtual columns  */
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    KEY *key_info = &(table->s->key_info[i]);
    // must be single column key
    int key_parts = KEY_N_KEY_PARTS(key_info);
    for (int j = 0; j < key_parts; j++) {
      if (key_info->key_part[j].key_part_flag & HA_REVERSE_SORT) {
        GRN_LOG(ctx, GRN_LOG_ERROR, "DESC indexes are not supported");
        error = ER_CANT_CREATE_TABLE;
        my_message(error, "DESC indexes are not supported", MYF(0));
        DBUG_RETURN(error);
      }
    }
    if (key_parts != 1) {
      continue;
    }
    Field *field = key_info->key_part[0].field;
    const char *column_name = field->field_name.str;
    if (strcmp(MRN_COLUMN_NAME_ID, column_name) == 0) {
      if (key_info->algorithm == HA_KEY_ALG_HASH) {
        continue; // hash index is ok
      }
      GRN_LOG(ctx, GRN_LOG_ERROR, "only hash index can be defined for _id");
      error = ER_CANT_CREATE_TABLE;
      my_message(error, "only hash index can be defined for _id", MYF(0));
      DBUG_RETURN(error);
    }
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_create_index_table(TABLE *table,
                                           const char *grn_table_name,
                                           grn_obj *grn_table,
                                           MRN_SHARE *tmp_share,
                                           KEY *key_info,
                                           grn_obj **index_tables,
                                           uint i)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  grn_obj *index_type;
  grn_obj *index_table;
  grn_obj_flags index_table_flags = GRN_OBJ_PERSISTENT;
  bool is_multiple_column_index = KEY_N_KEY_PARTS(key_info) > 1;

  if (tmp_share->index_table && tmp_share->index_table[i]) {
    index_table = grn_ctx_get(ctx,
                              tmp_share->index_table[i],
                              tmp_share->index_table_length[i]);
    // TODO: add error check
    index_tables[i] = index_table;
    DBUG_RETURN(error);
  }

  if (is_multiple_column_index) {
    index_type = grn_ctx_at(ctx, GRN_DB_SHORT_TEXT);
  } else {
    Field *field = key_info->key_part[0].field;
    grn_builtin_type groonga_type = mrn_grn_type_from_field(ctx, field, true);
    index_type = grn_ctx_at(ctx, groonga_type);
  }
  // TODO: Add NULL check for index_type

  int key_alg = key_info->algorithm;
  if (key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
    index_table_flags |= GRN_OBJ_TABLE_PAT_KEY;
    error = mrn_change_encoding(ctx, key_info->key_part->field->charset());
    if (error) {
      grn_obj_remove(ctx, grn_table);
      DBUG_RETURN(error);
    }
  } else if (key_alg == HA_KEY_ALG_HASH) {
    index_table_flags |= GRN_OBJ_TABLE_HASH_KEY;
  } else {
    index_table_flags |= GRN_OBJ_TABLE_PAT_KEY;
  }

  {
    mrn::IndexTableName index_table_name(grn_table_name, key_info->name.str);
    index_table = grn_table_create(ctx,
                                   index_table_name.c_str(),
                                   index_table_name.length(),
                                   NULL,
                                   index_table_flags,
                                   index_type,
                                   NULL);
  }
  if (ctx->rc) {
    grn_obj_unlink(ctx, index_type);
    grn_obj_remove(ctx, grn_table);
    error = ER_CANT_CREATE_TABLE;
    my_message(ER_CANT_CREATE_TABLE, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }

  if (key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
    grn_obj *tokenizer = find_tokenizer(key_info, tmp_share, i);
    if (tokenizer) {
      grn_info_type info_type = GRN_INFO_DEFAULT_TOKENIZER;
      grn_obj_set_info(ctx, index_table, info_type, tokenizer);
      grn_obj_unlink(ctx, tokenizer);
    }

    {
      grn_obj token_filters;
      GRN_PTR_INIT(&token_filters, GRN_OBJ_VECTOR, 0);
      if (find_token_filters(key_info, &token_filters)) {
        grn_obj_set_info(ctx, index_table,
                         GRN_INFO_TOKEN_FILTERS, &token_filters);
      }
      grn_obj_unlink(ctx, &token_filters);
    }
  }

  {
    grn_obj *normalizer = NULL;
    Field *field = &(key_info->key_part->field[0]);
    if (key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
      if (have_custom_normalizer(key_info) ||
          should_normalize(field)) {
        normalizer = find_normalizer(key_info);
      }
    } else if (key_alg != HA_KEY_ALG_HASH) {
      if (!is_multiple_column_index &&
          (have_custom_normalizer(key_info) ||
           should_normalize(field))) {
        normalizer = find_normalizer(key_info);
      }
    }
    if (normalizer) {
      grn_info_type info_type = GRN_INFO_NORMALIZER;
      grn_obj_set_info(ctx, index_table, info_type, normalizer);
      grn_obj_unlink(ctx, normalizer);
    }
  }

  index_tables[i] = index_table;

  DBUG_RETURN(error);
}

int ha_mroonga::storage_create_index(TABLE *table, const char *grn_table_name,
                                     grn_obj *grn_table, MRN_SHARE *tmp_share,
                                     KEY *key_info, grn_obj **index_tables,
                                     grn_obj **index_columns, uint i)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  grn_obj *index_column;

  bool is_multiple_column_index = KEY_N_KEY_PARTS(key_info) > 1;
  if (!is_multiple_column_index) {
    Field *field = key_info->key_part[0].field;
    if (strcmp(MRN_COLUMN_NAME_ID, field->field_name.str) == 0) {
      // skipping _id virtual column
      DBUG_RETURN(0);
    }

    if (is_foreign_key_field(table->s->table_name.str,
                             field->field_name.str)) {
      DBUG_RETURN(0);
    }

#ifdef HA_CAN_VIRTUAL_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      char error_message[MRN_MESSAGE_BUFFER_SIZE];
      snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
               "mroonga: storage: failed to create index: "
               ER_MRN_KEY_BASED_ON_GENERATED_VIRTUAL_COLUMN_STR,
               field->field_name.str);
      error = ER_MRN_KEY_BASED_ON_GENERATED_VIRTUAL_COLUMN_NUM;
      my_message(error, error_message, MYF(0));
      DBUG_RETURN(error);
    }
  } else {
    int j, n_key_parts = KEY_N_KEY_PARTS(key_info);
    for (j = 0; j < n_key_parts; j++) {
      Field *field = key_info->key_part[j].field;
      if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
        char error_message[MRN_MESSAGE_BUFFER_SIZE];
        snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
                 "mroonga: storage: failed to create index: "
                 ER_MRN_KEY_BASED_ON_GENERATED_VIRTUAL_COLUMN_STR,
                 field->field_name.str);
        error = ER_MRN_KEY_BASED_ON_GENERATED_VIRTUAL_COLUMN_NUM;
        my_message(error, error_message, MYF(0));
        DBUG_RETURN(error);
      }
    }
#endif
  }

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  error = storage_create_index_table(table, grn_table_name,
                                     grn_table, tmp_share,
                                     key_info, index_tables, i);
  if (error)
    DBUG_RETURN(error);

  grn_obj *index_table = index_tables[i];

  grn_column_flags index_column_flags = GRN_OBJ_COLUMN_INDEX | GRN_OBJ_PERSISTENT;

  if (!find_index_column_flags(key_info, &index_column_flags)) {
    grn_obj *tokenizer = grn_obj_get_info(ctx, index_table,
                                          GRN_INFO_DEFAULT_TOKENIZER, NULL);
    if (tokenizer) {
      index_column_flags |= GRN_OBJ_WITH_POSITION;
    }
    if (is_multiple_column_index && key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
      index_column_flags |= GRN_OBJ_WITH_SECTION;
    }
  }

  const char *index_column_name;
  if (tmp_share->index_table && tmp_share->index_table[i]) {
    index_column_name = key_info->name.str;
  } else {
    index_column_name = INDEX_COLUMN_NAME;
  }
  index_column = grn_column_create(ctx,
                                   index_table,
                                   index_column_name,
                                   strlen(index_column_name),
                                   NULL,
                                   index_column_flags,
                                   grn_table);

  if (ctx->rc) {
    grn_obj_remove(ctx, index_table);
    error = ER_CANT_CREATE_TABLE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }

  mrn_change_encoding(ctx, system_charset_info);
  if (is_multiple_column_index) {
    if (key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
      grn_obj source_ids;
      GRN_UINT32_INIT(&source_ids, GRN_OBJ_VECTOR);

      int j, n_key_parts = KEY_N_KEY_PARTS(key_info);
      for (j = 0; j < n_key_parts; j++) {
        Field *field = key_info->key_part[j].field;
        mrn::ColumnName column_name(field->field_name);
        grn_obj *source_column = grn_obj_column(ctx,
                                                grn_table,
                                                column_name.c_str(),
                                                column_name.length());
        grn_id source_id = grn_obj_id(ctx, source_column);
        GRN_UINT32_PUT(ctx, &source_ids, source_id);
        grn_obj_unlink(ctx, source_column);
      }
      mrn_change_encoding(ctx, key_info->key_part->field->charset());
      grn_obj_set_info(ctx, index_column, GRN_INFO_SOURCE, &source_ids);
      grn_obj_unlink(ctx, &source_ids);
    }
  } else {
    Field *field = key_info->key_part[0].field;
    mrn::ColumnName column_name(field->field_name);
    grn_obj *column;
    column = grn_obj_column(ctx,
                            grn_table,
                            column_name.c_str(),
                            column_name.length());
    if (column) {
      grn_obj source_ids;
      grn_id source_id = grn_obj_id(ctx, column);
      GRN_UINT32_INIT(&source_ids, GRN_OBJ_VECTOR);
      GRN_UINT32_PUT(ctx, &source_ids, source_id);
      mrn_change_encoding(ctx, key_info->key_part->field->charset());
      grn_obj_set_info(ctx, index_column, GRN_INFO_SOURCE, &source_ids);
      grn_obj_unlink(ctx, &source_ids);
      grn_obj_unlink(ctx, column);
    }
  }
  mrn_change_encoding(ctx, system_charset_info);

  if (index_columns) {
    index_columns[i] = index_column;
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_create_indexes(TABLE *table, const char *grn_table_name,
                                       grn_obj *grn_table, MRN_SHARE *tmp_share)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  uint n_keys = table->s->keys;
  uint i;
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_tables, n_keys);
  for (i = 0; i < n_keys; i++) {
    index_tables[i] = NULL;
    if (i == table->s->primary_key) {
      continue; // pkey is already handled
    }
    KEY *key_info = &table->s->key_info[i];
    if (tmp_share->disable_keys && !(key_info->flags & HA_NOSAME)) {
      continue; // key is disabled
    }
    if ((error = storage_create_index(table, grn_table_name, grn_table,
                                      tmp_share, key_info,
                                      index_tables, NULL, i))) {
      break;
    }
  }
  if (error) {
    while (true) {
      if (index_tables[i] &&
          !(tmp_share->index_table && tmp_share->index_table[i])) {
        grn_obj_remove(ctx, index_tables[i]);
      }
      if (!i)
        break;
      i--;
    }
  }
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
  DBUG_RETURN(error);
}

int ha_mroonga::ensure_database_open(const char *name, mrn::Database **db)
{
  int error;

  MRN_DBUG_ENTER_METHOD();

  if (db)
    *db = NULL;

  mrn::Database *local_db;
  error = mrn_db_manager->open(name, &local_db);
  if (error)
    DBUG_RETURN(error);

  if (db)
    *db = local_db;
  grn_ctx_use(ctx, local_db->get());

  delete operations_;
  operations_ = new mrn::Operations(ctx);
  if (mrn_enable_operations_recording) {
    operations_->enable_recording();
  } else {
    operations_->disable_recording();
  }

  DBUG_RETURN(error);
}

int ha_mroonga::ensure_database_remove(const char *name)
{
  int error;

  MRN_DBUG_ENTER_METHOD();

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  delete operations_;
  operations_ = NULL;

  mrn_db_manager->close(name);

  mrn::PathMapper mapper(name);
  remove_related_files(mapper.db_path());

  DBUG_RETURN(error);
}


int ha_mroonga::create(const char *name,
                       TABLE *table,
                       HA_CREATE_INFO *info
#ifdef MRN_HANDLER_CREATE_HAVE_TABLE_DEFINITION
                       ,
                       dd::Table *table_def
#endif
  )
{
  int error = 0;
  MRN_SHARE *tmp_share;
  MRN_DBUG_ENTER_METHOD();
  /* checking data type of virtual columns */

  if (!(tmp_share = mrn_get_share(name, table, &error)))
    DBUG_RETURN(error);

  st_mrn_slot_data *slot_data = mrn_get_slot_data(ha_thd(), false);
  if (slot_data && slot_data->disable_keys_create_info == info) {
    tmp_share->disable_keys = true;
  }

  if (tmp_share->wrapper_mode)
  {
    error = wrapper_create(name, table, info, tmp_share);
  } else {
    error = storage_create(name, table, info, tmp_share);
  }

  if (error) {
    mrn_free_long_term_share(tmp_share->long_term_share);
    tmp_share->long_term_share = NULL;
  } else {
    error = add_wrap_hton(tmp_share->table_name, tmp_share->hton);
  }
  mrn_free_share(tmp_share);
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_open(const char *name, int mode, uint open_options)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();

  mrn::Database *db = NULL;
  error = ensure_database_open(name, &db);
  if (error)
    DBUG_RETURN(error);

  error = open_table(name);
  if (error && !(open_options & HA_OPEN_FOR_REPAIR))
    goto error_exit;

  error = wrapper_open_indexes(name);
  if (error && !(open_options & HA_OPEN_FOR_REPAIR))
    goto error_exit;

  error = 0;

  mrn_init_alloc_root(&mem_root, 1024, 0, MYF(0));
  wrap_key_info = mrn_create_key_info_for_table(share, table, &error);
  if (error)
    DBUG_RETURN(error);
  base_key_info = table->key_info;

  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (!is_clone)
  {
    wrap_handler = get_new_handler(table->s, &mem_root, share->hton);
    if (!wrap_handler)
    {
      MRN_SET_BASE_SHARE_KEY(share, table->s);
      MRN_SET_BASE_TABLE_KEY(this, table);
      if (wrap_key_info)
      {
        my_free(wrap_key_info);
        wrap_key_info = NULL;
      }
      base_key_info = NULL;
      DBUG_RETURN(HA_ERR_OUT_OF_MEM);
    }
#ifdef MRN_HANDLER_HAVE_SET_HA_SHARE_REF
    wrap_handler->set_ha_share_ref(&table->s->ha_share);
#endif
    error = wrap_handler->ha_open(table, name, mode, open_options);
    wrap_handler->set_optimizer_costs(ha_thd());
  } else {
    if (!(wrap_handler = parent_for_clone->wrap_handler->clone(name,
      mem_root_for_clone)))
    {
      MRN_SET_BASE_SHARE_KEY(share, table->s);
      MRN_SET_BASE_TABLE_KEY(this, table);
      if (wrap_key_info)
      {
        my_free(wrap_key_info);
        wrap_key_info = NULL;
      }
      base_key_info = NULL;
      DBUG_RETURN(HA_ERR_OUT_OF_MEM);
    }
  }
  ref_length = wrap_handler->ref_length;
  key_used_on_scan = wrap_handler->key_used_on_scan;
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  init();
  wrapper_overwrite_index_bits();
  wrapper_set_keys_in_use();

  pk_keypart_map = make_prev_keypart_map(
    KEY_N_KEY_PARTS(&(table->key_info[table_share->primary_key])));

  if (!error) {
    if (open_options & HA_OPEN_FOR_REPAIR) {
      // TODO: How to check whether is DISABLE KEYS used or not?
      error = wrapper_recreate_indexes(ha_thd());
    } else if (db) {
      mrn::Lock lock(&mrn_operations_mutex);
      mrn::PathMapper mapper(name);
      const char *table_name = mapper.table_name();
      size_t table_name_size = strlen(table_name);
      if (db->is_broken_table(table_name, table_name_size)) {
        GRN_LOG(ctx, GRN_LOG_NOTICE,
                "Auto repair is started: <%s>",
                name);
        error = operations_->clear(table_name, table_name_size);
        if (!error) {
          db->mark_table_repaired(table_name, table_name_size);
          if (!share->disable_keys) {
            // TODO: implemented by "reindex" instead of "remove and recreate".
            // Because "remove and recreate" invalidates opened indexes by
            // other threads.
            error = wrapper_disable_indexes_mroonga(key_map(table->s->keys), false);
            if (!error) {
              error = wrapper_enable_indexes_mroonga(key_map(table->s->keys), false);
            }
          }
        }
        GRN_LOG(ctx, GRN_LOG_NOTICE,
                "Auto repair is done: <%s>: %s",
                name, error == 0 ? "success" : "failure");
      }
    }
  }

error_exit:
  if (error)
  {
    grn_obj_unlink(ctx, grn_table);
    grn_table = NULL;
    // TODO: free indexes.

    delete wrap_handler;
    wrap_handler = NULL;
    if (wrap_key_info)
    {
      my_free(wrap_key_info);
      wrap_key_info = NULL;
    }
    base_key_info = NULL;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_open_indexes(const char *name)
{
  int error;

  MRN_DBUG_ENTER_METHOD();

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  uint n_keys = table->s->keys;
  uint n_primary_keys = table->s->primary_key;
  if (n_keys > 0) {
    // TODO: reduce allocate memories. We only need just
    // for HA_KEY_ALG_FULLTEXT keys.
    grn_index_tables = (grn_obj **)malloc(sizeof(grn_obj *) * n_keys);
    grn_index_columns = (grn_obj **)malloc(sizeof(grn_obj *) * n_keys);
  } else {
    grn_index_tables = grn_index_columns = NULL;
  }

  mrn::PathMapper mapper(name);
  uint i = 0;
  for (i = 0; i < n_keys; i++) {
    KEY *key_info = &(table->s->key_info[i]);

    grn_index_tables[i] = NULL;
    grn_index_columns[i] = NULL;

    if (!(wrapper_is_target_index(key_info))) {
      continue;
    }

    if (i == n_primary_keys) {
      continue;
    }

    mrn::IndexTableName index_table_name(mapper.table_name(), key_info->name.str);
    grn_index_tables[i] = grn_ctx_get(ctx,
                                      index_table_name.c_str(),
                                      index_table_name.length());
    if (ctx->rc == GRN_SUCCESS && !grn_index_tables[i]) {
      grn_index_tables[i] = grn_ctx_get(ctx,
                                        index_table_name.old_c_str(),
                                        index_table_name.old_length());
    }
    if (ctx->rc) {
      DBUG_PRINT("info",
                 ("mroonga: sql_command=%u", thd_sql_command(ha_thd())));
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      goto error;
    }

    grn_index_columns[i] = grn_obj_column(ctx, grn_index_tables[i],
                                          INDEX_COLUMN_NAME,
                                          strlen(INDEX_COLUMN_NAME));
    if (!grn_index_columns[i]) {
      /* just for backward compatibility before 1.0. */
      Field *field = key_info->key_part[0].field;
      grn_index_columns[i] = grn_obj_column(ctx, grn_index_tables[i],
                                            field->field_name.str,
                                            field->field_name.length);
    }

    if (ctx->rc) {
      DBUG_PRINT("info",
        ("mroonga: sql_command=%u", thd_sql_command(ha_thd())));
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      grn_obj_unlink(ctx, grn_index_tables[i]);
      goto error;
    }
  }

  grn_bulk_space(ctx, &key_buffer, table->key_info->key_length);

error:
  if (error) {
    while (i-- > 0) {
      grn_obj *index_column = grn_index_columns[i];
      if (index_column) {
        grn_obj_unlink(ctx, index_column);
      }
      grn_obj *index_table = grn_index_tables[i];
      if (index_table) {
        grn_obj_unlink(ctx, index_table);
      }
    }
    free(grn_index_columns);
    free(grn_index_tables);
    grn_index_columns = NULL;
    grn_index_tables = NULL;
  }

  DBUG_RETURN(error);
}

void ha_mroonga::wrapper_overwrite_index_bits()
{
  uint i, j;
  longlong table_option = table_flags();
  MRN_DBUG_ENTER_METHOD();
  table_share->keys_for_keyread.clear_all();
  for (i = 0; i < table_share->fields; i++)
  {
    Field *field = table_share->field[i];
    field->part_of_key.clear_all();
#ifdef MRN_HAVE_MYSQL_FIELD_PART_OF_KEY_NOT_CLUSTERED
    field->part_of_key_not_clustered.clear_all();
#endif
    field->part_of_sortkey.clear_all();
    /*
      TODO: We may need to update field->part_of_key_not_extended for
      MySQL >= 5.7.18. If users report "raw InnoDB can use index for
      this case but Mroonga wrapper mode for InnoDB can't use index
      for the same case", we'll reconsider it again.
    */
  }
  for (i = 0; i < table_share->keys; i++) {
    KEY *key_info = &table->s->key_info[i];
    KEY_PART_INFO *key_part = key_info->key_part;
    for (j = 0 ; j < KEY_N_KEY_PARTS(key_info); key_part++, j++)
    {
      Field *field = key_part->field;
      if (field->key_length() == key_part->length &&
          !(field->flags & BLOB_FLAG))
      {
        if (index_flags(i, j, 0) & HA_KEYREAD_ONLY)
        {
          table_share->keys_for_keyread.set_bit(i);
          field->part_of_key.set_bit(i);
#ifdef MRN_HAVE_MYSQL_FIELD_PART_OF_KEY_NOT_CLUSTERED
          field->part_of_key_not_clustered.set_bit(i);
#endif
        }
        if (index_flags(i, j, 1) & HA_READ_ORDER)
          field->part_of_sortkey.set_bit(i);
      }
      if (i == table_share->primary_key &&
          (table_option & HA_PRIMARY_KEY_IN_READ_INDEX))
      {
        if (field->key_length() == key_part->length &&
            !(field->flags & BLOB_FLAG))
          field->part_of_key = table_share->keys_in_use;
        if (field->part_of_sortkey.is_set(i))
          field->part_of_sortkey = table_share->keys_in_use;
      }
    }
  }
  DBUG_VOID_RETURN;
}

int ha_mroonga::storage_reindex()
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();

  uint n_keys = table_share->keys;
  KEY *key_info = table->key_info;

  bool have_multiple_column_index = false;
  bitmap_clear_all(table->read_set);
  for (uint i = 0; i < n_keys; ++i) {
    if (!grn_index_columns[i])
      continue;

    grn_hash *columns = grn_hash_create(ctx, NULL, sizeof(grn_id), 0,
                                        GRN_OBJ_TABLE_HASH_KEY);
    grn_table_columns(ctx, grn_index_tables[i], NULL, 0,
                      reinterpret_cast<grn_obj *>(columns));
    unsigned int n_columns =
      grn_table_size(ctx, reinterpret_cast<grn_obj *>(columns));
    grn_hash_close(ctx, columns);

    bool is_multiple_column_index =
      (KEY_N_KEY_PARTS(&(key_info[i])) != 1 &&
       key_info[i].algorithm != HA_KEY_ALG_FULLTEXT);

    if (n_columns == 1 || is_multiple_column_index) {
      grn_table_truncate(ctx, grn_index_tables[i]);
      if (ctx->rc != GRN_SUCCESS) {
        error = ER_ERROR_ON_WRITE;
        char error_message[MRN_MESSAGE_BUFFER_SIZE];
        char index_table_name[GRN_TABLE_MAX_KEY_SIZE];
        int index_table_name_size;
        index_table_name_size =
          grn_obj_name(ctx, grn_index_tables[i],
                       index_table_name, GRN_TABLE_MAX_KEY_SIZE);
        snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
                 "mroonga: reindex: failed to truncate index table: "
                 "<%.*s>: <%s>(%d)",
                 index_table_name_size, index_table_name,
                 ctx->errbuf, ctx->rc);
        my_message(error, error_message, MYF(0));
        break;
      }
    }

    if (is_multiple_column_index) {
      mrn_set_bitmap_by_key(table->read_set, &key_info[i]);
      have_multiple_column_index = true;
    } else {
      grn_obj_reindex(ctx, grn_index_columns[i]);
      if (ctx->rc != GRN_SUCCESS) {
        error = ER_ERROR_ON_WRITE;
        char error_message[MRN_MESSAGE_BUFFER_SIZE];
        char index_column_name[GRN_TABLE_MAX_KEY_SIZE];
        int index_column_name_size;
        index_column_name_size =
          grn_obj_name(ctx, grn_index_columns[i],
                       index_column_name, GRN_TABLE_MAX_KEY_SIZE);
        snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
                 "mroonga: reindex: failed to reindex: "
                 "<%.*s>: <%s>(%d)",
                 index_column_name_size, index_column_name,
                 ctx->errbuf, ctx->rc);
        my_message(error, error_message, MYF(0));
        break;
      }
    }
  }

  if (!error && have_multiple_column_index)
    error = storage_add_index_multiple_columns(key_info, n_keys,
                                               grn_index_tables,
                                               grn_index_columns,
                                               false);
  bitmap_set_all(table->read_set);

  DBUG_RETURN(error);
}

int ha_mroonga::storage_open(const char *name, int mode, uint open_options)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();

  mrn::Database *db;
  error = ensure_database_open(name, &db);
  if (error)
    DBUG_RETURN(error);

  error = open_table(name);
  if (error)
    DBUG_RETURN(error);

  error = storage_open_columns();
  if (error) {
    grn_obj_unlink(ctx, grn_table);
    grn_table = NULL;
    DBUG_RETURN(error);
  }

  error = storage_open_indexes(name);
  if (error && !(open_options & HA_OPEN_FOR_REPAIR)) {
    storage_close_columns();
    grn_obj_unlink(ctx, grn_table);
    grn_table = NULL;
    DBUG_RETURN(error);
  }

  storage_set_keys_in_use();

  if (!(open_options & HA_OPEN_FOR_REPAIR)) {
    mrn::Lock lock(&mrn_operations_mutex);
    mrn::PathMapper mapper(name);
    const char *table_name = mapper.table_name();
    size_t table_name_size = strlen(table_name);
    if (db->is_broken_table(table_name, table_name_size)) {
      GRN_LOG(ctx, GRN_LOG_NOTICE,
              "Auto repair is started: <%s>",
              name);
      error = operations_->repair(table_name, table_name_size);
      if (!error)
        db->mark_table_repaired(table_name, table_name_size);
      if (!share->disable_keys) {
        if (!error)
          error = storage_reindex();
      }
      GRN_LOG(ctx, GRN_LOG_NOTICE,
              "Auto repair is done: <%s>: %s",
              name, error == 0 ? "success" : "failure");
    }
  }

  ref_length = sizeof(grn_id);
  DBUG_RETURN(0);
}

int ha_mroonga::open_table(const char *name)
{
  int error;
  MRN_DBUG_ENTER_METHOD();

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  mrn::PathMapper mapper(name);
  grn_table = grn_ctx_get(ctx, mapper.table_name(), strlen(mapper.table_name()));
  if (ctx->rc) {
    error = ER_CANT_OPEN_FILE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  if (!grn_table) {
    error = ER_CANT_OPEN_FILE;
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "mroonga: failed to open table: <%s>",
             mapper.table_name());
    my_message(error, error_message, MYF(0));
    DBUG_RETURN(error);
  }

  DBUG_RETURN(0);
}

int ha_mroonga::storage_open_columns(void)
{
  int error;
  MRN_DBUG_ENTER_METHOD();

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  int n_columns = table->s->fields;
  grn_columns = (grn_obj **)malloc(sizeof(grn_obj *) * n_columns);
  grn_column_ranges = (grn_obj **)malloc(sizeof(grn_obj *) * n_columns);
  for (int i = 0; i < n_columns; i++) {
      grn_columns[i] = NULL;
      grn_column_ranges[i] = NULL;
  }

  if (table_share->blob_fields)
  {
    DBUG_ASSERT(!blob_buffers);
    if (!(blob_buffers = new (&table->mem_root) String[n_columns]))
    {
      DBUG_RETURN(HA_ERR_OUT_OF_MEM);
    }
  }

  for (int i = 0; i < n_columns; i++) {
    Field *field = table->field[i];
    mrn::ColumnName column_name(field->field_name);
    if (table_share->blob_fields)
    {
      blob_buffers[i].set_charset(field->charset());
    }
    if (strcmp(MRN_COLUMN_NAME_ID, column_name.mysql_name()) == 0) {
      continue;
    }
#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      grn_columns[i] = NULL;
      grn_column_ranges[i] = NULL;
      continue;
    }
#endif

    grn_columns[i] = grn_obj_column(ctx,
                                    grn_table,
                                    column_name.c_str(),
                                    column_name.length());
    if (!grn_columns[i]) {
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      break;
    }

    grn_id range_id = grn_obj_get_range(ctx, grn_columns[i]);
    grn_column_ranges[i] = grn_ctx_at(ctx, range_id);
    if (!grn_column_ranges[i]) {
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      break;
    }
  }

  if (error != 0) {
    storage_close_columns();
  }

  DBUG_RETURN(error);
}

void ha_mroonga::storage_close_columns(void)
{
  int n_columns = table->s->fields;
  for (int i = 0; i < n_columns; i++) {
    grn_obj *column = grn_columns[i];
    if (column) {
      grn_obj_unlink(ctx, column);
    }

    grn_obj *range = grn_column_ranges[i];
    if (range) {
      grn_obj_unlink(ctx, range);
    }
  }

  free(grn_columns);
  grn_columns = NULL;
  free(grn_column_ranges);
  grn_column_ranges = NULL;
}

int ha_mroonga::storage_open_indexes(const char *name)
{
  int error;

  MRN_DBUG_ENTER_METHOD();

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  uint n_keys = table->s->keys;
  uint pkey_nr = table->s->primary_key;
  if (n_keys > 0) {
    grn_index_tables = (grn_obj **)malloc(sizeof(grn_obj *) * n_keys);
    grn_index_columns = (grn_obj **)malloc(sizeof(grn_obj *) * n_keys);
    key_id = (grn_id *)malloc(sizeof(grn_id) * n_keys);
    del_key_id = (grn_id *)malloc(sizeof(grn_id) * n_keys);
  } else {
    grn_index_tables = grn_index_columns = NULL;
    key_id = NULL;
    del_key_id = NULL;
  }

  mrn::PathMapper mapper(name);
  uint i, j;
  for (i = 0; i < n_keys; i++) {
    if (i == pkey_nr) {
      grn_index_tables[i] = grn_index_columns[i] = NULL;
      continue;
    }

    KEY *key_info = &(table->s->key_info[i]);
    if (KEY_N_KEY_PARTS(key_info) > 1) {
      KEY_PART_INFO *key_part = key_info->key_part;
      for (j = 0; j < KEY_N_KEY_PARTS(key_info); j++) {
        bitmap_set_bit(&multiple_column_key_bitmap,
                       key_part[j].field->field_index);
      }
    }

    MRN_SHARE *tmp_share;
    tmp_share = mrn_get_share(name, table, &error);
    if (tmp_share->index_table[i]) {
      grn_index_tables[i] = grn_ctx_get(ctx,
                                        tmp_share->index_table[i],
                                        tmp_share->index_table_length[i]);
      if (ctx->rc == GRN_SUCCESS) {
        grn_index_columns[i] = grn_obj_column(ctx,
                                              grn_index_tables[i],
                                              key_info->name.str,
                                              key_info->name.length);
      }
    } else {
      mrn::IndexTableName index_table_name(mapper.table_name(),
                                           key_info->name.str);
      grn_index_tables[i] = grn_ctx_get(ctx,
                                        index_table_name.c_str(),
                                        index_table_name.length());
      if (ctx->rc == GRN_SUCCESS && !grn_index_tables[i]) {
        grn_index_tables[i] = grn_ctx_get(ctx,
                                          index_table_name.old_c_str(),
                                          index_table_name.old_length());
      }
      if (ctx->rc == GRN_SUCCESS) {
        grn_index_columns[i] = grn_obj_column(ctx,
                                              grn_index_tables[i],
                                              INDEX_COLUMN_NAME,
                                              strlen(INDEX_COLUMN_NAME));
        if (!grn_index_columns[i] && ctx->rc == GRN_SUCCESS) {
          /* just for backward compatibility before 1.0. */
          Field *field = key_info->key_part[0].field;
          grn_index_columns[i] = grn_obj_column(ctx, grn_index_tables[i],
                                                field->field_name.str,
                                                field->field_name.length);
        }
      }
    }
    mrn_free_share(tmp_share);
    if (ctx->rc) {
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      goto error;
    }

    if (ctx->rc) {
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      goto error;
    }
  }

error:
  if (error) {
    if (i) {
      while (true) {
        grn_obj *index_column = grn_index_columns[i];
        if (index_column) {
          grn_obj_unlink(ctx, index_column);
        }
        grn_obj *index_table = grn_index_tables[i];
        if (index_table) {
          grn_obj_unlink(ctx, index_table);
        }
        if (!i)
          break;
        i--;
      }
    }
    free(key_id);
    free(del_key_id);
    free(grn_index_columns);
    free(grn_index_tables);
    key_id = NULL;
    del_key_id = NULL;
    grn_index_columns = NULL;
    grn_index_tables = NULL;
  }

  DBUG_RETURN(error);
}

int ha_mroonga::open(const char *name,
                     int mode,
                     uint open_options
#ifdef MRN_HANDLER_OPEN_HAVE_TABLE_DEFINITION
                     ,
                     const dd::Table *table_def
#endif
  )
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();

  if (!(share = mrn_get_share(name, table, &error)))
    DBUG_RETURN(error);
  thr_lock_data_init(&share->lock,&thr_lock_data,NULL);

  if (my_bitmap_init(&multiple_column_key_bitmap, NULL, table->s->fields))
  {
    mrn_free_share(share);
    share = NULL;
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
  }

  if (share->wrapper_mode)
  {
    error = wrapper_open(name, mode, open_options);
  } else {
    error = storage_open(name, mode, open_options);
  }

  if (error)
  {
    my_bitmap_free(&multiple_column_key_bitmap);
    mrn_free_share(share);
    share = NULL;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_close()
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
#ifdef MRN_HANDLER_HAVE_CHECK_IF_SUPPORTED_INPLACE_ALTER
  if (alter_key_info_buffer) {
    my_free(alter_key_info_buffer);
    alter_key_info_buffer = NULL;
  }
#else
  if (wrap_alter_key_info) {
    my_free(wrap_alter_key_info);
    wrap_alter_key_info = NULL;
  }
#endif
#ifdef MRN_HANDLER_HAVE_HA_CLOSE
  error = wrap_handler->ha_close();
#else
  error = wrap_handler->close();
#endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  delete wrap_handler;
  wrap_handler = NULL;
  if (wrap_key_info)
  {
    my_free(wrap_key_info);
    wrap_key_info = NULL;
  }
  base_key_info = NULL;
  free_root(&mem_root, MYF(0));
  DBUG_RETURN(error);
}

int ha_mroonga::storage_close()
{
  MRN_DBUG_ENTER_METHOD();
  grn_obj_unlink(ctx, grn_table);
  // TODO: unlink elements
  free(grn_columns);
  // TODO: unlink elements
  free(grn_column_ranges);
  DBUG_RETURN(0);
}

int ha_mroonga::close()
{
  int error = 0;
  THD *thd = ha_thd();
  MRN_DBUG_ENTER_METHOD();

  clear_indexes();

  if (share->wrapper_mode)
  {
    error = wrapper_close();
  } else {
    error = storage_close();
  }

  if (error != 0)
  {
    DBUG_RETURN(error);
  }

  if (thd)
  {
    error = add_wrap_hton(share->table_name, share->hton);
  }
  my_bitmap_free(&multiple_column_key_bitmap);
  if (share->use_count == 1) {
    mrn_free_long_term_share(share->long_term_share);
  }
  mrn_free_share(share);
  share = NULL;
  is_clone = false;

  if (
    thd &&
    thd_sql_command(thd) == SQLCOM_FLUSH
  ) {
    /* flush tables */
    mrn::Lock lock(&mrn_open_tables_mutex);
    if (!mrn_open_tables.records)
    {
      int tmp_error = mrn_db_manager->clear();
      if (tmp_error)
        error = tmp_error;
    }
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_delete_table(const char *name,
                                     handlerton *wrap_handlerton,
                                     const char *table_name)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(wrap_handlerton->drop_table(wrap_handlerton, name));
}

int ha_mroonga::generic_delete_table(const char *name, const char *table_name)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();

  error = ensure_database_open(name);
  if (error)
    DBUG_RETURN(error);

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  error = drop_indexes(table_name);
  grn_obj *table_obj = grn_ctx_get(ctx, table_name, strlen(table_name));
  if (table_obj) {
    grn_obj_remove(ctx, table_obj);
  }
  if (ctx->rc) {
    error = ER_CANT_OPEN_FILE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::delete_table(const char *name)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;
  THD *thd = ha_thd();
  handlerton *wrap_handlerton = NULL;
  mrn::PathMapper mapper(name);
  st_mrn_slot_data *slot_data = mrn_get_slot_data(thd, false);
  if (slot_data && slot_data->first_wrap_hton)
  {
    st_mrn_wrap_hton *wrap_hton, *tmp_wrap_hton;
    tmp_wrap_hton = NULL;
    wrap_hton = slot_data->first_wrap_hton;
    while (wrap_hton)
    {
      if (!strcmp(wrap_hton->path, name))
      {
        /* found */
        wrap_handlerton = wrap_hton->hton;
        if (tmp_wrap_hton)
          tmp_wrap_hton->next = wrap_hton->next;
        else
          slot_data->first_wrap_hton = wrap_hton->next;
        free(wrap_hton);
        break;
      }
      tmp_wrap_hton = wrap_hton;
      wrap_hton = wrap_hton->next;
    }
  }

  if (!wrap_handlerton) {
    bool open_table_to_get_wrap_handlerton = true;
    if (mapper.is_internal_table_name()) {
      open_table_to_get_wrap_handlerton = false;
    }
    if (open_table_to_get_wrap_handlerton) {
      TABLE_LIST table_list;
      LEX_CSTRING db_name=    { mapper.db_name(), strlen(mapper.db_name()) };
      LEX_CSTRING table_name= { mapper.mysql_table_name(), strlen(mapper.mysql_table_name()) };

      table_list.init_one_table(&db_name, &table_name, 0, TL_WRITE);
      mrn_open_mutex_lock(NULL);
      TABLE_SHARE *tmp_table_share =
        mrn_create_tmp_table_share(&table_list, name, &error);
      error = 0;
      mrn_open_mutex_unlock(NULL);
      if (tmp_table_share) {
        TABLE tmp_table;
        tmp_table.s = tmp_table_share;
#ifdef WITH_PARTITION_STORAGE_ENGINE
        tmp_table.part_info = NULL;
#endif
        MRN_SHARE *tmp_share = mrn_get_share(name, &tmp_table, &error);
        if (tmp_share) {
          wrap_handlerton = tmp_share->hton;
          mrn_free_long_term_share(tmp_share->long_term_share);
          tmp_share->long_term_share = NULL;
          mrn_free_share(tmp_share);
        }
        mrn_open_mutex_lock(NULL);
        mrn_free_tmp_table_share(tmp_table_share);
        mrn_open_mutex_unlock(NULL);
        if (error) {
          DBUG_RETURN(error);
        }
      }
    }
  }

  if (wrap_handlerton)
  {
    error = wrapper_delete_table(name, wrap_handlerton, mapper.table_name());
  }

  if (!error)
  {
    error = generic_delete_table(name, mapper.table_name());
  }

  if (!error) {
    error = operations_->clear(name, strlen(name));
  }

  DBUG_RETURN(error);
}

void ha_mroonga::wrapper_set_keys_in_use()
{
  uint i, j;
  MRN_DBUG_ENTER_METHOD();
  mrn::AutoIncrementValueLock lock_(table_share);
  table_share->keys_in_use.set_prefix(table_share->keys);
  share->disable_keys = false;
  for (i = 0; i < table_share->keys; i++) {
    j = share->wrap_key_nr[i];
    if (j < MAX_KEY) {
      if (!share->wrap_table_share->keys_in_use.is_set(j)) {
        /* copy bitmap */
        table_share->keys_in_use.clear_bit(i);
        share->disable_keys = true;
      }
    } else {
      if (!grn_index_tables || !grn_index_tables[i]) {
        /* disabled */
        table_share->keys_in_use.clear_bit(i);
        share->disable_keys = true;
      }
    }
  }
  table_share->keys_for_keyread.set_prefix(table_share->keys);
  table_share->keys_for_keyread.intersect(table_share->keys_in_use);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_set_keys_in_use()
{
  uint i;
  MRN_DBUG_ENTER_METHOD();
  mrn::AutoIncrementValueLock lock_(table_share);
  table_share->keys_in_use.set_prefix(table_share->keys);
  share->disable_keys = false;
  for (i = 0; i < table_share->keys; i++) {
    if (i == table_share->primary_key) {
      continue;
    }
    if (grn_index_tables && !grn_index_tables[i]) {
      /* disabled */
      table_share->keys_in_use.clear_bit(i);
      DBUG_PRINT("info", ("mroonga: key %u disabled", i));
      share->disable_keys = true;
    }
  }
  table_share->keys_for_keyread.set_prefix(table_share->keys);
  table_share->keys_for_keyread.intersect(table_share->keys_in_use);
  DBUG_VOID_RETURN;
}

int ha_mroonga::wrapper_info(uint flag)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();

  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->info(flag);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  if (flag & HA_STATUS_ERRKEY) {
    errkey = wrap_handler->errkey;
    memcpy(dup_ref, wrap_handler->dup_ref, wrap_handler->ref_length);
  }
  if (flag & HA_STATUS_TIME) {
    stats.update_time = wrap_handler->stats.update_time;
  }
  if (flag & HA_STATUS_CONST) {
    stats.max_data_file_length = wrap_handler->stats.max_data_file_length;
    stats.create_time = wrap_handler->stats.create_time;
    stats.block_size = wrap_handler->stats.block_size;
    wrapper_set_keys_in_use();
  }
  if (flag & HA_STATUS_VARIABLE) {
    stats.data_file_length = wrap_handler->stats.data_file_length;
    stats.index_file_length = wrap_handler->stats.index_file_length;
    stats.records = wrap_handler->stats.records;
    stats.mean_rec_length = wrap_handler->stats.mean_rec_length;
    stats.check_time = wrap_handler->stats.check_time;
  }
  if (flag & HA_STATUS_AUTO) {
    stats.auto_increment_value = wrap_handler->stats.auto_increment_value;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_info(uint flag)
{
  MRN_DBUG_ENTER_METHOD();
  mrn_change_encoding(ctx, NULL);

  if (flag & (HA_STATUS_ERRKEY | HA_STATUS_NO_LOCK)) {
    errkey = dup_key;
  }

  if ((flag & HA_STATUS_AUTO) && table->found_next_number_field) {
    THD *thd = ha_thd();
    ulonglong nb_reserved_values;
    bool next_number_field_is_null = !table->next_number_field;
    mrn::ExternalLock mrn_external_lock(ha_thd(), this,
                                        mrn_lock_type == F_UNLCK ?
                                        F_RDLCK : F_UNLCK);
    if (mrn_external_lock.error()) {
      DBUG_RETURN(mrn_external_lock.error());
    }
    if (next_number_field_is_null) {
      table->next_number_field = table->found_next_number_field;
    }
    MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
    {
      mrn::Lock lock(&long_term_share->auto_inc_mutex);
      unsigned long auto_increment_offset, auto_increment_increment;
      MRN_THD_GET_AUTOINC(thd, &auto_increment_offset,
                          &auto_increment_increment);
      storage_get_auto_increment(auto_increment_offset,
                                 auto_increment_increment, 1,
                                 &stats.auto_increment_value,
                                 &nb_reserved_values);
    }
    if (next_number_field_is_null) {
      table->next_number_field = NULL;
    }
  }

  if (flag & HA_STATUS_CONST) {
    storage_set_keys_in_use();
  }

  if (flag & HA_STATUS_VARIABLE) {
    storage_info_variable();
  }

  DBUG_RETURN(0);
}

void ha_mroonga::storage_info_variable()
{
  MRN_DBUG_ENTER_METHOD();

  storage_info_variable_records();
  storage_info_variable_data_file_length();

  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_info_variable_records()
{
  MRN_DBUG_ENTER_METHOD();

  stats.records = grn_table_size(ctx, grn_table);

  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_info_variable_data_file_length()
{
  MRN_DBUG_ENTER_METHOD();

  stats.data_file_length = 0;
  stats.data_file_length += file_size(grn_obj_path(ctx, grn_table));
  grn_hash *columns = grn_hash_create(ctx, NULL, sizeof(grn_id), 0,
                                      GRN_OBJ_TABLE_HASH_KEY);
  grn_table_columns(ctx, grn_table, NULL, 0, (grn_obj *)columns);
  /* grn_id id __attribute__((unused)); */
  grn_id *column_id;
  GRN_HASH_EACH(ctx, columns, id, &column_id, NULL, NULL, {
    grn_obj *column = grn_ctx_at(ctx, *column_id);
    stats.data_file_length += file_size(grn_obj_path(ctx, column));
    grn_obj_unlink(ctx, column);
  });
  grn_hash_close(ctx, columns);

  DBUG_VOID_RETURN;
}

int ha_mroonga::info(uint flag)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_info(flag);
  } else {
    error = storage_info(flag);
  }
  DBUG_RETURN(error);
}

uint ha_mroonga::wrapper_lock_count() const
{
  uint lock_count;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  lock_count = wrap_handler->lock_count();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(lock_count);
}

uint ha_mroonga::storage_lock_count() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(1);
}

uint ha_mroonga::lock_count() const
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_lock_count();
  } else {
    error = storage_lock_count();
  }
  DBUG_RETURN(error);
}

THR_LOCK_DATA **ha_mroonga::wrapper_store_lock(THD *thd, THR_LOCK_DATA **to,
                                               enum thr_lock_type lock_type)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  to = wrap_handler->store_lock(thd, to, lock_type);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(to);
}

THR_LOCK_DATA **ha_mroonga::storage_store_lock(THD *thd, THR_LOCK_DATA **to,
                                               enum thr_lock_type lock_type)
{
  MRN_DBUG_ENTER_METHOD();
  if (lock_type != TL_IGNORE && thr_lock_data.type == TL_UNLOCK) {
    if (!thd_in_lock_tables(thd)) {
      if (lock_type == TL_READ_NO_INSERT) {
        lock_type = TL_READ;
      } else if (lock_type >= TL_WRITE_CONCURRENT_INSERT &&
                 lock_type <= TL_WRITE && !thd_tablespace_op(thd)) {
        lock_type = TL_WRITE_ALLOW_WRITE;
      }
    }

    thr_lock_data.type = lock_type;
  }
  *to++ = &thr_lock_data;
  DBUG_RETURN(to);
}

THR_LOCK_DATA **ha_mroonga::store_lock(THD *thd, THR_LOCK_DATA **to,
                                       enum thr_lock_type lock_type)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_PRINT("info", ("mroonga: lock_type=%s",
                      mrn_inspect_thr_lock_type(lock_type)));
  if (share->wrapper_mode)
    to = wrapper_store_lock(thd, to, lock_type);
  else
    to = storage_store_lock(thd, to, lock_type);
  DBUG_RETURN(to);
}

int ha_mroonga::wrapper_external_lock(THD *thd, int lock_type)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_external_lock(thd, lock_type);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_external_lock(THD *thd, int lock_type)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(0);
}

int ha_mroonga::external_lock(THD *thd, int lock_type)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  mrn_lock_type = lock_type;
  if (share->wrapper_mode)
  {
    error = wrapper_external_lock(thd, lock_type);
  } else {
    error = storage_external_lock(thd, lock_type);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_rnd_init(bool scan)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_rnd_init(scan);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_rnd_init(bool scan)
{
  MRN_DBUG_ENTER_METHOD();
  mrn_change_encoding(ctx, NULL);
  cursor = grn_table_cursor_open(ctx, grn_table, NULL, 0, NULL, 0, 0, -1, 0);
  if (ctx->rc) {
    my_message(ER_ERROR_ON_READ, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_READ);
  }
  DBUG_RETURN(0);
}

int ha_mroonga::rnd_init(bool scan)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_rnd_init(scan);
  } else {
    error = storage_rnd_init(scan);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_rnd_end()
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_rnd_end();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_rnd_end()
{
  MRN_DBUG_ENTER_METHOD();
  clear_cursor();
  DBUG_RETURN(0);
}

int ha_mroonga::rnd_end()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_rnd_end();
  } else {
    error = storage_rnd_end();
  }
  DBUG_RETURN(error);
}

#ifdef MRN_HANDLER_RECORDS_RETURN_ERROR
int ha_mroonga::wrapper_records(ha_rows *num_rows)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_records(num_rows);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_records(ha_rows *num_rows)
{
  MRN_DBUG_ENTER_METHOD();
  int error = handler::records(num_rows);
  DBUG_RETURN(error);
}

int ha_mroonga::records(ha_rows *num_rows)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode) {
    error = wrapper_records(num_rows);
  } else {
    error = storage_records(num_rows);
  }
  DBUG_RETURN(error);
}
#else
ha_rows ha_mroonga::wrapper_records()
{
  ha_rows num_rows;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  num_rows = wrap_handler->records();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(num_rows);
}

ha_rows ha_mroonga::storage_records()
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows num_rows = handler::records();
  DBUG_RETURN(num_rows);
}

ha_rows ha_mroonga::records()
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows num_rows;
  if (share->wrapper_mode) {
    num_rows = wrapper_records();
  } else {
    num_rows = storage_records();
  }
  DBUG_RETURN(num_rows);
}
#endif

int ha_mroonga::wrapper_rnd_next(uchar *buf)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
#ifdef MRN_HANDLER_HAVE_HA_RND_NEXT
  error = wrap_handler->ha_rnd_next(buf);
#else
  error = wrap_handler->rnd_next(buf);
#endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_rnd_next(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = storage_get_next_record(buf);
  DBUG_RETURN(error);
}

int ha_mroonga::rnd_next(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_rnd_next(buf);
  } else {
    error = storage_rnd_next(buf);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_rnd_pos(uchar *buf, uchar *pos)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
#ifdef MRN_HANDLER_HAVE_HA_RND_POS
  error = wrap_handler->ha_rnd_pos(buf, pos);
#else
  error = wrap_handler->rnd_pos(buf, pos);
#endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_rnd_pos(uchar *buf, uchar *pos)
{
  MRN_DBUG_ENTER_METHOD();
  record_id = *((grn_id*) pos);
  storage_store_fields(buf, record_id);
  DBUG_RETURN(0);
}

int ha_mroonga::rnd_pos(uchar *buf, uchar *pos)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_rnd_pos(buf, pos);
  } else {
    error = storage_rnd_pos(buf, pos);
  }
  DBUG_RETURN(error);
}

void ha_mroonga::wrapper_position(const uchar *record)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->ref = ref;
  wrap_handler->position(record);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_position(const uchar *record)
{
  MRN_DBUG_ENTER_METHOD();
  memcpy(ref, &record_id, sizeof(grn_id));
  DBUG_VOID_RETURN;
}

void ha_mroonga::position(const uchar *record)
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
    wrapper_position(record);
  else
    storage_position(record);
  DBUG_VOID_RETURN;
}

int ha_mroonga::generic_extra(enum ha_extra_function operation)
{
  MRN_DBUG_ENTER_METHOD();
  switch (operation) {
  case HA_EXTRA_IGNORE_DUP_KEY:
    ignoring_duplicated_key = true;
    break;
  case HA_EXTRA_NO_IGNORE_DUP_KEY:
    ignoring_duplicated_key = false;
    break;
  case HA_EXTRA_WRITE_CAN_REPLACE:
    replacing_ = true;
    break;
  case HA_EXTRA_WRITE_CANNOT_REPLACE:
    replacing_ = false;
    break;
  case HA_EXTRA_INSERT_WITH_UPDATE:
    inserting_with_update = true;
    break;
  case HA_EXTRA_KEYREAD:
    ignoring_no_key_columns = true;
    break;
  case HA_EXTRA_NO_KEYREAD:
    ignoring_no_key_columns = false;
    break;
  default:
    break;
  }
  DBUG_RETURN(0);
}

int ha_mroonga::wrapper_extra(enum ha_extra_function operation)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->extra(operation);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_extra(enum ha_extra_function operation)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(0);
}

int ha_mroonga::extra(enum ha_extra_function operation)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  DBUG_PRINT("info",
             ("mroonga: this=%p; extra-operation=%s",
              this, mrn_inspect_extra_function(operation)));
  if (share->wrapper_mode) {
    if ((error = wrapper_extra(operation)))
      DBUG_RETURN(error);
  } else {
    if ((error = storage_extra(operation)))
      DBUG_RETURN(error);
  }
  error = generic_extra(operation);
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_extra_opt(enum ha_extra_function operation,
                                  ulong cache_size)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->extra_opt(operation, cache_size);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_extra_opt(enum ha_extra_function operation,
                                  ulong cache_size)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(0);
}

int ha_mroonga::extra_opt(enum ha_extra_function operation, ulong cache_size)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    if ((error = wrapper_extra_opt(operation, cache_size)))
      DBUG_RETURN(error);
  } else {
    if ((error = storage_extra_opt(operation, cache_size)))
      DBUG_RETURN(error);
  }
  error = generic_extra(operation);
  DBUG_RETURN(error);
}

bool ha_mroonga::wrapper_is_target_index(KEY *key_info)
{
  MRN_DBUG_ENTER_METHOD();
  bool target_index =
    key_info->algorithm == HA_KEY_ALG_FULLTEXT || mrn_is_geo_key(key_info);
  DBUG_PRINT("info", ("mroonga: %s", target_index ? "true" : "false"));
  DBUG_RETURN(target_index);
}

bool ha_mroonga::wrapper_have_target_index()
{
  MRN_DBUG_ENTER_METHOD();

  bool have_target_index = false;

  uint i;
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    KEY *key_info = &(table->key_info[i]);

    if (wrapper_is_target_index(key_info)) {
      have_target_index = true;
      break;
    }
  }

  DBUG_PRINT("info", ("mroonga: %s", have_target_index ? "true" : "false"));
  DBUG_RETURN(have_target_index);
}

int ha_mroonga::wrapper_write_row(const uchar *buf)
{
  int error = 0;
  THD *thd = ha_thd();

  MRN_DBUG_ENTER_METHOD();

  mrn::Operation operation(operations_,
                           "write",
                           table->s->table_name.str,
                           table->s->table_name.length);

  operation.record_target(record_id);
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  tmp_disable_binlog(thd);
  error = wrap_handler->ha_write_row(buf);
  insert_id_for_cur_row = wrap_handler->insert_id_for_cur_row;
  reenable_binlog(thd);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);

  if (!error && wrapper_have_target_index()) {
    error = wrapper_write_row_index(buf);
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_write_row_index(const uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  if (is_dry_write()) {
    DBUG_PRINT("info", ("mroonga: dry write: ha_mroonga::%s", __FUNCTION__));
    DBUG_RETURN(error);
  }

  mrn_change_encoding(ctx, NULL);
  GRN_BULK_REWIND(&key_buffer);
  grn_bulk_space(ctx, &key_buffer, table->key_info->key_length);
  key_copy((uchar *)(GRN_TEXT_VALUE(&key_buffer)),
           buf,
           &(table->key_info[table_share->primary_key]),
           table->key_info[table_share->primary_key].key_length);

  int added;
  grn_id record_id;
  record_id = grn_table_add(ctx, grn_table,
                            GRN_TEXT_VALUE(&key_buffer),
                            GRN_TEXT_LEN(&key_buffer),
                            &added);
  if (record_id == GRN_ID_NIL) {
    DBUG_PRINT("info", ("mroonga: failed to add a new record into groonga"));
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "failed to add a new record into groonga: key=<%.*s>",
             (int)GRN_TEXT_LEN(&key_buffer),
             GRN_TEXT_VALUE(&key_buffer));
    error = ER_ERROR_ON_WRITE;
    push_warning(ha_thd(), MRN_SEVERITY_WARNING, error,
                 error_message);
    DBUG_RETURN(0);
  }

  mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
  uint i;
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    KEY *key_info = &(table->key_info[i]);

    if (!(wrapper_is_target_index(key_info))) {
      continue;
    }

    grn_obj *index_column = grn_index_columns[i];
    if (!index_column) {
      continue;
    }

    uint j;
    for (j = 0; j < KEY_N_KEY_PARTS(key_info); j++) {
      Field *field = key_info->key_part[j].field;

      if (field->is_null())
        continue;

      error = mrn_change_encoding(ctx, field->charset());
      if (error)
        goto err;
      error = generic_store_bulk(field, &new_value_buffer);
      if (error) {
        my_message(error,
                   "mroonga: wrapper: "
                   "failed to get new value for updating index.",
                   MYF(0));
        goto err;
      }

      grn_rc rc;
      rc = grn_column_index_update(ctx, index_column, record_id, j + 1,
                                   NULL, &new_value_buffer);
      if (rc) {
        error = ER_ERROR_ON_WRITE;
        my_message(error, ctx->errbuf, MYF(0));
        goto err;
      }
    }
  }
err:

  DBUG_RETURN(error);
}

int ha_mroonga::storage_write_row(const uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool unique_indexes_are_processed = false;

  if (is_dry_write()) {
    DBUG_PRINT("info", ("mroonga: dry write: ha_mroonga::%s", __FUNCTION__));
    DBUG_RETURN(error);
  }

  mrn::Operation operation(operations_,
                           "write",
                           table->s->table_name.str,
                           table->s->table_name.length);

  THD *thd = ha_thd();
  int i;
  int n_columns = table->s->fields;

  if (table->next_number_field && buf == table->record[0])
  {
    if ((error = update_auto_increment()))
      DBUG_RETURN(error);
  }

  mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
  for (i = 0; i < n_columns; i++) {
    Field *field = table->field[i];

#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      continue;
    }
#endif

    if (field->is_null()) continue;

    mrn::ColumnName column_name(field->field_name);
    if (strcmp(MRN_COLUMN_NAME_ID, column_name.c_str()) == 0) {
      push_warning_printf(thd, MRN_SEVERITY_WARNING,
                          WARN_DATA_TRUNCATED,
                          MRN_GET_ERR_MSG(WARN_DATA_TRUNCATED),
                          MRN_COLUMN_NAME_ID,
                          MRN_GET_CURRENT_ROW_FOR_WARNING(thd));
      if (MRN_ABORT_ON_WARNING(thd)) {
        DBUG_RETURN(ER_DATA_TOO_LONG);
      }
    }
  }

  uint pkey_nr = table->s->primary_key;

  int added = 0;
  {
    mrn::Lock lock(&(share->record_mutex), have_unique_index());
    if ((error = storage_write_row_unique_indexes(buf)))
    {
      DBUG_RETURN(error);
    }
    unique_indexes_are_processed = true;

    char *pkey;
    int pkey_size;
    GRN_BULK_REWIND(&key_buffer);
    if (pkey_nr == MAX_INDEXES) {
      pkey = NULL;
      pkey_size = 0;
    } else {
      KEY *key_info = &(table->key_info[pkey_nr]);
      if (KEY_N_KEY_PARTS(key_info) == 1) {
        Field *pkey_field = key_info->key_part[0].field;
        error = mrn_change_encoding(ctx, pkey_field->charset());
        if (error) {
          DBUG_RETURN(error);
        }
        generic_store_bulk(pkey_field, &key_buffer);
        pkey = GRN_TEXT_VALUE(&key_buffer);
        pkey_size = GRN_TEXT_LEN(&key_buffer);
      } else {
        mrn_change_encoding(ctx, NULL);
        uchar key[MRN_MAX_KEY_SIZE];
        key_copy(key, buf, key_info, key_info->key_length);
        grn_bulk_reserve(ctx, &key_buffer, MRN_MAX_KEY_SIZE);
        pkey = GRN_TEXT_VALUE(&key_buffer);
        storage_encode_multiple_column_key(key_info,
                                           key, key_info->key_length,
                                           (uchar *)pkey, (uint *)&pkey_size);
      }
    }

    if (grn_table->header.type != GRN_TABLE_NO_KEY && pkey_size == 0) {
      my_message(ER_ERROR_ON_WRITE, "primary key is empty", MYF(0));
      DBUG_RETURN(ER_ERROR_ON_WRITE);
    }

    record_id = grn_table_add(ctx, grn_table, pkey, pkey_size, &added);
    if (ctx->rc) {
      my_message(ER_ERROR_ON_WRITE, ctx->errbuf, MYF(0));
      DBUG_RETURN(ER_ERROR_ON_WRITE);
    }
    if (!added) {
      // duplicated error
      error = HA_ERR_FOUND_DUPP_KEY;
      memcpy(dup_ref, &record_id, sizeof(grn_id));
      dup_key = pkey_nr;
      if (!ignoring_duplicated_key) {
        GRN_LOG(ctx, GRN_LOG_ERROR,
                "duplicated id on insert: update primary key: <%.*s>",
                pkey_size, pkey);
      }
      uint j;
      for (j = 0; j < table->s->keys; j++) {
        if (j == pkey_nr) {
          continue;
        }
        KEY *key_info = &table->key_info[j];
        if (key_info->flags & HA_NOSAME) {
          grn_table_delete_by_id(ctx, grn_index_tables[j], key_id[j]);
        }
      }
      DBUG_RETURN(error);
    }
    operation.record_target(record_id);
  }

  grn_obj colbuf;
  GRN_VOID_INIT(&colbuf);
  for (i = 0; i < n_columns; i++) {
    Field *field = table->field[i];

    if (field->is_null())
      continue;

#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      continue;
    }
#endif

    mrn::ColumnName column_name(field->field_name);

#ifdef MRN_HAVE_SPATIAL
    bool is_null_geometry_value =
      field->real_type() == MYSQL_TYPE_GEOMETRY &&
      static_cast<Field_blob *>(field)->get_length() == 0;
    if (is_null_geometry_value) {
      continue;
    }
#endif

    if (strcmp(MRN_COLUMN_NAME_ID, column_name.c_str()) == 0) {
      continue;
    }

    error = mrn_change_encoding(ctx, field->charset());
    if (error) {
      GRN_OBJ_FIN(ctx, &colbuf);
      goto err;
    }
    error = generic_store_bulk(field, &colbuf);
    if (error) {
      GRN_OBJ_FIN(ctx, &colbuf);
      goto err;
    }

    grn_obj *column = grn_columns[i];
    if (is_foreign_key_field(table->s->table_name.str, field->field_name.str)) {
      grn_obj value;
      GRN_RECORD_INIT(&value, 0, grn_obj_get_range(ctx, column));
      grn_rc cast_rc = grn_obj_cast(ctx, &colbuf, &value, GRN_FALSE);
      if (cast_rc != GRN_SUCCESS) {
        grn_obj inspected;
        GRN_TEXT_INIT(&inspected, 0);
        grn_inspect(ctx, &inspected, &colbuf);
        error = HA_ERR_NO_REFERENCED_ROW;
        GRN_PLUGIN_ERROR(ctx, GRN_INVALID_ARGUMENT,
                         "foreign record doesn't exist: <%s>:<%.*s>",
                         field->field_name.str,
                         static_cast<int>(GRN_TEXT_LEN(&inspected)),
                         GRN_TEXT_VALUE(&inspected));
        GRN_OBJ_FIN(ctx, &value);
        GRN_OBJ_FIN(ctx, &colbuf);
        GRN_OBJ_FIN(ctx, &inspected);
        goto err;
      }
      grn_obj_set_value(ctx, column, record_id, &value, GRN_OBJ_SET);
    } else {
      if (added && is_grn_zero_column_value(column, &colbuf)) {
        // WORKAROUND: groonga can't index newly added '0' value for
        // fix size column. So we add non-'0' value first then add
        // real '0' value again. It will be removed when groonga
        // supports 'null' value.
        char *bytes = GRN_BULK_HEAD(&colbuf);
        bytes[0] = '\1';
        grn_obj_set_value(ctx, column, record_id, &colbuf, GRN_OBJ_SET);
        bytes[0] = '\0';
      }
      grn_obj_set_value(ctx, column, record_id, &colbuf, GRN_OBJ_SET);
    }
    if (ctx->rc) {
      GRN_OBJ_FIN(ctx, &colbuf);
      my_message(ER_ERROR_ON_WRITE, ctx->errbuf, MYF(0));
      error = ER_ERROR_ON_WRITE;
      goto err;
    }
  }
  GRN_OBJ_FIN(ctx, &colbuf);

  error = storage_write_row_multiple_column_indexes(buf, record_id);
  if (error) {
    goto err;
  }

  // for UDF last_insert_grn_id()
  st_mrn_slot_data *slot_data;
  slot_data = mrn_get_slot_data(thd, true);
  if (slot_data == NULL) {
    error = HA_ERR_OUT_OF_MEM;
    goto err;
  }
  slot_data->last_insert_record_id = record_id;

  grn_db_touch(ctx, grn_ctx_db(ctx));

  if (table->found_next_number_field &&
      !table->s->next_number_keypart) {
    Field_num *field = (Field_num *) table->found_next_number_field;
    if (field->unsigned_flag || field->val_int() > 0) {
      MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
      ulonglong nr = (ulonglong) field->val_int();
      if (!long_term_share->auto_inc_inited) {
        storage_info(HA_STATUS_AUTO);
      }
      {
        mrn::Lock lock(&long_term_share->auto_inc_mutex);
        if (long_term_share->auto_inc_value <= nr) {
          long_term_share->auto_inc_value = nr + 1;
          DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
            long_term_share->auto_inc_value));
        }
      }
    }
  }
  DBUG_RETURN(0);

err:
  if (unique_indexes_are_processed) {
    uint j;
    for (j = 0; j < table->s->keys; j++) {
      if (j == pkey_nr) {
        continue;
      }
      KEY *key_info = &table->key_info[j];
      if (key_info->flags & HA_NOSAME) {
        grn_table_delete_by_id(ctx, grn_index_tables[j], key_id[j]);
      }
    }
  }
  grn_table_delete_by_id(ctx, grn_table, record_id);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_write_row_multiple_column_index(const uchar *buf,
                                                        grn_id record_id,
                                                        KEY *key_info,
                                                        grn_obj *index_column)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  mrn_change_encoding(ctx, NULL);
  GRN_BULK_REWIND(&key_buffer);
  grn_bulk_space(ctx, &key_buffer, key_info->key_length);
  key_copy((uchar *)(GRN_TEXT_VALUE(&key_buffer)),
           buf,
           key_info,
           key_info->key_length);
  GRN_BULK_REWIND(&encoded_key_buffer);
  grn_bulk_reserve(ctx, &encoded_key_buffer, MRN_MAX_KEY_SIZE);
  uint encoded_key_length;
  storage_encode_multiple_column_key(key_info,
                                     (uchar *)(GRN_TEXT_VALUE(&key_buffer)),
                                     key_info->key_length,
                                     (uchar *)(GRN_TEXT_VALUE(&encoded_key_buffer)),
                                     &encoded_key_length);
  grn_bulk_space(ctx, &encoded_key_buffer, encoded_key_length);
  DBUG_PRINT("info", ("mroonga: key_length=%u", key_info->key_length));
  DBUG_PRINT("info", ("mroonga: encoded_key_length=%u", encoded_key_length));

  grn_rc rc;
  rc = grn_column_index_update(ctx, index_column, record_id, 1, NULL,
                               &encoded_key_buffer);
  if (rc) {
    error = ER_ERROR_ON_WRITE;
    my_message(error, ctx->errbuf, MYF(0));
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_write_row_multiple_column_indexes(const uchar *buf,
                                                          grn_id record_id)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
  uint i;
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &(table->key_info[i]);

    if (KEY_N_KEY_PARTS(key_info) == 1 || key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
      continue;
    }

    grn_obj *index_column = grn_index_columns[i];
    if (!index_column) {
      continue;
    }

    if ((error = storage_write_row_multiple_column_index(buf,
                                                         record_id,
                                                         key_info,
                                                         index_column)))
    {
      goto err;
    }
  }

err:

  DBUG_RETURN(error);
}

int ha_mroonga::storage_write_row_unique_index(const uchar *buf,
                                               KEY *key_info,
                                               grn_obj *index_table,
                                               grn_obj *index_column,
                                               grn_id *key_id)
{
  char *ukey = NULL;
  int error, ukey_size = 0;
  MRN_DBUG_ENTER_METHOD();
  GRN_BULK_REWIND(&key_buffer);
  if (KEY_N_KEY_PARTS(key_info) == 1) {
    Field *ukey_field = key_info->key_part[0].field;
    error = mrn_change_encoding(ctx, ukey_field->charset());
    if (error) {
      DBUG_RETURN(error);
    }
    generic_store_bulk(ukey_field, &key_buffer);
    ukey = GRN_TEXT_VALUE(&key_buffer);
    ukey_size = GRN_TEXT_LEN(&key_buffer);
  } else {
    mrn_change_encoding(ctx, NULL);
    uchar key[MRN_MAX_KEY_SIZE];
    key_copy(key, buf, key_info, key_info->key_length);
    grn_bulk_reserve(ctx, &key_buffer, MRN_MAX_KEY_SIZE);
    ukey = GRN_TEXT_VALUE(&key_buffer);
    storage_encode_multiple_column_key(key_info,
                                       key, key_info->key_length,
                                       (uchar *)(ukey), (uint *)&ukey_size);
  }

  int added;
  *key_id = grn_table_add(ctx, index_table, ukey, ukey_size, &added);
  if (ctx->rc) {
    my_message(ER_ERROR_ON_WRITE, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_WRITE);
  }
  if (!added) {
    // duplicated error
    error = HA_ERR_FOUND_DUPP_KEY;
    grn_id duplicated_record_id = GRN_ID_NIL;
    {
      grn_table_cursor *table_cursor;
      table_cursor = grn_table_cursor_open(ctx, index_table,
                                           ukey, ukey_size,
                                           ukey, ukey_size,
                                           0, -1, 0);
      if (table_cursor) {
        grn_obj *index_cursor;
        index_cursor = grn_index_cursor_open(ctx, table_cursor, index_column,
                                             GRN_ID_NIL, GRN_ID_MAX, 0);
        if (index_cursor) {
          grn_posting *posting;
          posting = grn_index_cursor_next(ctx, index_cursor, NULL);
          if (posting) {
            duplicated_record_id = posting->rid;
          }
        }
        grn_obj_unlink(ctx, index_cursor);
      }
      grn_table_cursor_close(ctx, table_cursor);
    }
    memcpy(dup_ref, &duplicated_record_id, sizeof(grn_id));
    if (!ignoring_duplicated_key) {
      GRN_LOG(ctx, GRN_LOG_ERROR,
              "duplicated id on insert: update unique index: <%.*s>",
              ukey_size, ukey);
    }
    DBUG_RETURN(error);
  }
  DBUG_RETURN(0);
}

int ha_mroonga::storage_write_row_unique_indexes(const uchar *buf)
{
  int error = 0;
  uint i;
  uint n_keys = table->s->keys;
  MRN_DBUG_ENTER_METHOD();

  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &table->key_info[i];

    if (!(key_info->flags & HA_NOSAME)) {
      continue;
    }

    grn_obj *index_table = grn_index_tables[i];
    if (!index_table) {
      continue;
    }
    grn_obj *index_column = grn_index_columns[i];
    if (!index_column) {
      continue;
    }

    if ((error = storage_write_row_unique_index(buf, key_info,
                                                index_table, index_column,
                                                &key_id[i])))
    {
      if (error == HA_ERR_FOUND_DUPP_KEY)
      {
        dup_key = i;
      }
      goto err;
    }
  }
  DBUG_RETURN(0);

err:
  if (i) {
    mrn_change_encoding(ctx, NULL);
    do {
      i--;

      if (i == table->s->primary_key) {
        continue;
      }

      KEY *key_info = &table->key_info[i];
      if (!(key_info->flags & HA_NOSAME)) {
        continue;
      }

      if (key_info->flags & HA_NOSAME) {
        grn_table_delete_by_id(ctx, grn_index_tables[i], key_id[i]);
      }
    } while (i);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::write_row(const uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_write_row(buf);
  } else {
    error = storage_write_row(buf);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_get_record_id(uchar *data, grn_id *record_id,
                                      const char *context)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  grn_obj key;
  GRN_TEXT_INIT(&key, 0);

  mrn_change_encoding(ctx, NULL);
  grn_bulk_space(ctx, &key, table->key_info->key_length);
  key_copy((uchar *)(GRN_TEXT_VALUE(&key)),
           data,
           &(table->key_info[table_share->primary_key]),
           table->key_info[table_share->primary_key].key_length);

  *record_id = grn_table_get(ctx, grn_table,
                             GRN_TEXT_VALUE(&key), GRN_TEXT_LEN(&key));
  if (*record_id == GRN_ID_NIL) {
    DBUG_PRINT("info", ("mroonga: %s", context));
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "%s: key=<%.*s>",
             context, (int)GRN_TEXT_LEN(&key), GRN_TEXT_VALUE(&key));
    error = ER_ERROR_ON_WRITE;
    push_warning(ha_thd(), MRN_SEVERITY_WARNING, error,
                 error_message);
  }
  grn_obj_unlink(ctx, &key);

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_update_row(const uchar *old_data,
                                   const uchar *new_data)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;
  THD *thd = ha_thd();

  mrn::Operation operation(operations_,
                           "update",
                           table->s->table_name.str,
                           table->s->table_name.length);

  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  tmp_disable_binlog(thd);
  error = wrap_handler->ha_update_row(old_data, new_data);
  reenable_binlog(thd);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);

  if (!error && wrapper_have_target_index()) {
    error = wrapper_update_row_index(old_data, new_data);
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_update_row_index(const uchar *old_data,
                                         const uchar *new_data)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  if (is_dry_write()) {
    DBUG_PRINT("info", ("mroonga: dry write: ha_mroonga::%s", __FUNCTION__));
    DBUG_RETURN(error);
  }

  mrn_change_encoding(ctx, NULL);
  KEY *key_info = &(table->key_info[table_share->primary_key]);
  GRN_BULK_REWIND(&key_buffer);
  key_copy((uchar *)(GRN_TEXT_VALUE(&key_buffer)),
           new_data,
           key_info, key_info->key_length);
  int added;
  grn_id new_record_id;
  new_record_id = grn_table_add(ctx, grn_table,
                                GRN_TEXT_VALUE(&key_buffer),
                                table->key_info->key_length,
                                &added);
  if (new_record_id == GRN_ID_NIL) {
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "failed to get new record ID for updating from groonga: key=<%.*s>",
             (int)GRN_TEXT_LEN(&key_buffer), GRN_TEXT_VALUE(&key_buffer));
    error = ER_ERROR_ON_WRITE;
    my_message(error, error_message, MYF(0));
    DBUG_RETURN(error);
  }

  grn_id old_record_id;
  my_ptrdiff_t ptr_diff = PTR_BYTE_DIFF(old_data, table->record[0]);

  error = wrapper_get_record_id((uchar *)old_data, &old_record_id,
                                "failed to get old record ID "
                                "for updating from groonga");
  if (error) {
    DBUG_RETURN(0);
  }

  mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
  uint i;
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    KEY *key_info = &(table->key_info[i]);

    if (!(wrapper_is_target_index(key_info))) {
      continue;
    }

    grn_obj *index_column = grn_index_columns[i];
    if (!index_column) {
      /* disable keys */
      continue;
    }

    uint j;
    for (j = 0; j < KEY_N_KEY_PARTS(key_info); j++) {
      Field *field = key_info->key_part[j].field;

      generic_store_bulk(field, &new_value_buffer);

      field->move_field_offset(ptr_diff);
      generic_store_bulk(field, &old_value_buffer);
      field->move_field_offset(-ptr_diff);

      grn_rc rc;
      if (old_record_id == new_record_id) {
        if (added) {
          rc = grn_column_index_update(ctx, index_column, old_record_id, j + 1,
                                       &old_value_buffer, NULL);
          if (!rc) {
            rc = grn_column_index_update(ctx, index_column, new_record_id, j + 1,
                                         NULL, &new_value_buffer);
          }
        } else {
          rc = grn_column_index_update(ctx, index_column, old_record_id, j + 1,
                                       &old_value_buffer, &new_value_buffer);
        }
      } else {
        rc = grn_column_index_update(ctx, index_column, old_record_id, j + 1,
                                     &old_value_buffer, NULL);
        if (!rc) {
          rc = grn_column_index_update(ctx, index_column, new_record_id, j + 1,
                                       NULL, &new_value_buffer);
        }
        if (!rc) {
          rc = grn_table_delete_by_id(ctx, grn_table, old_record_id);
        }
      }
      if (rc) {
        error = ER_ERROR_ON_WRITE;
        my_message(error, ctx->errbuf, MYF(0));
        goto err;
      }
    }
  }
err:

  DBUG_RETURN(error);
}

int ha_mroonga::storage_update_row(const uchar *old_data,
                                   const uchar *new_data)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  if (is_dry_write()) {
    DBUG_PRINT("info", ("mroonga: dry write: ha_mroonga::%s", __FUNCTION__));
    DBUG_RETURN(error);
  }

  mrn::Operation operation(operations_,
                           "update",
                           table->s->table_name.str,
                           table->s->table_name.length);
  operation.record_target(record_id);

  grn_obj colbuf;
  int i;
  uint j;
  int n_columns = table->s->fields;
  THD *thd = ha_thd();

  for (i = 0; i < n_columns; i++) {
    Field *field = table->field[i];

#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      continue;
    }
#endif

    if (!bitmap_is_set(table->write_set, field->field_index))
      continue;

    if (field->is_null())
      continue;

    {
      mrn::ColumnName column_name(field->field_name);
      if (strcmp(MRN_COLUMN_NAME_ID, column_name.c_str()) == 0) {
        push_warning_printf(thd, MRN_SEVERITY_WARNING,
                            WARN_DATA_TRUNCATED, MRN_GET_ERR_MSG(WARN_DATA_TRUNCATED),
                            MRN_COLUMN_NAME_ID,
                            MRN_GET_CURRENT_ROW_FOR_WARNING(thd));
        if (MRN_ABORT_ON_WARNING(thd)) {
          DBUG_RETURN(ER_DATA_TOO_LONG);
        }
      }
    }

    if (!is_foreign_key_field(table->s->table_name.str, field->field_name.str))
      continue;

    {
      grn_obj *column = grn_columns[i];
      grn_obj new_value;
      GRN_VOID_INIT(&new_value);
      {
        mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
        generic_store_bulk(field, &new_value);
      }
      grn_obj casted_value;
      GRN_RECORD_INIT(&casted_value, 0, grn_obj_get_range(ctx, column));
      grn_rc cast_rc = grn_obj_cast(ctx, &new_value, &casted_value, GRN_FALSE);
      GRN_OBJ_FIN(ctx, &casted_value);
      if (cast_rc != GRN_SUCCESS) {
        grn_obj inspected;
        GRN_TEXT_INIT(&inspected, 0);
        grn_inspect(ctx, &inspected, &new_value);
        GRN_OBJ_FIN(ctx, &new_value);
        error = HA_ERR_NO_REFERENCED_ROW;
        GRN_PLUGIN_ERROR(ctx, GRN_INVALID_ARGUMENT,
                         "foreign record doesn't exist: <%s>:<%.*s>",
                         field->field_name.str,
                         static_cast<int>(GRN_TEXT_LEN(&inspected)),
                         GRN_TEXT_VALUE(&inspected));
        GRN_OBJ_FIN(ctx, &inspected);
        DBUG_RETURN(error);
      }
      GRN_OBJ_FIN(ctx, &new_value);
    }
  }

  KEY *pkey_info = NULL;
  storage_store_fields_for_prep_update(old_data, new_data, record_id);
  {
    mrn::Lock lock(&(share->record_mutex), have_unique_index());
    mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
    if ((error = storage_prepare_delete_row_unique_indexes(old_data,
                                                           record_id))) {
      DBUG_RETURN(error);
    }
    if ((error = storage_update_row_unique_indexes(new_data)))
    {
      DBUG_RETURN(error);
    }
  }

  if (table->s->primary_key != MAX_INDEXES) {
    pkey_info = &(table->key_info[table->s->primary_key]);
  }
  GRN_VOID_INIT(&colbuf);
  for (i = 0; i < n_columns; i++) {
    Field *field = table->field[i];

#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      continue;
    }
#endif

    if (bitmap_is_set(table->write_set, field->field_index)) {
      mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
      DBUG_PRINT("info", ("mroonga: update column %d(%d)",i,field->field_index));

      if (field->is_null()) continue;

      mrn::ColumnName column_name(field->field_name);
      if (strcmp(MRN_COLUMN_NAME_ID, column_name.c_str()) == 0) {
        continue;
      }

      error = mrn_change_encoding(ctx, field->charset());
      if (error)
        goto err;

      bool is_pkey = false;
      bool on_duplicate_key_update =
        (inserting_with_update && ignoring_duplicated_key);
      if (pkey_info && !on_duplicate_key_update) {
        for (j = 0; j < KEY_N_KEY_PARTS(pkey_info); j++) {
          Field *pkey_field = pkey_info->key_part[j].field;
          if (strcmp(pkey_field->field_name.str, column_name.c_str()) == 0) {
            is_pkey = true;
            break;
          }
        }
      }

      generic_store_bulk(field, &colbuf);
      if (is_pkey) {
        bool is_multiple_column_index = KEY_N_KEY_PARTS(pkey_info) > 1;
        bool is_same_value;
        if (is_multiple_column_index) {
          is_same_value = false;
        } else {
          grn_id found_record_id = grn_table_get(ctx,
                                                 grn_table,
                                                 GRN_BULK_HEAD(&colbuf),
                                                 GRN_BULK_VSIZE(&colbuf));
          is_same_value = (record_id == found_record_id);
        }
        if (!is_same_value && !replacing_) {
          char message[MRN_BUFFER_SIZE];
          snprintf(message, MRN_BUFFER_SIZE,
                   "data truncated for primary key column: <%s>",
                   column_name.c_str());
          push_warning(thd, MRN_SEVERITY_WARNING,
                       WARN_DATA_TRUNCATED, message);
        }
        continue;
      }

      grn_obj_set_value(ctx, grn_columns[i], record_id, &colbuf, GRN_OBJ_SET);
      if (ctx->rc) {
        grn_obj_unlink(ctx, &colbuf);
        my_message(ER_ERROR_ON_WRITE, ctx->errbuf, MYF(0));
        error = ER_ERROR_ON_WRITE;
        goto err;
      }
    }
  }
  grn_obj_unlink(ctx, &colbuf);

  if ((error = storage_update_row_index(old_data, new_data)))
  {
    goto err;
  }

  if ((error = storage_delete_row_unique_indexes()))
  {
    DBUG_RETURN(error);
  }

  grn_db_touch(ctx, grn_ctx_db(ctx));

  if (table->found_next_number_field &&
      !table->s->next_number_keypart &&
      new_data == table->record[0]) {
    mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
    Field_num *field = (Field_num *) table->found_next_number_field;
    if (field->unsigned_flag || field->val_int() > 0) {
      MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
      ulonglong nr = (ulonglong) field->val_int();
      if (!long_term_share->auto_inc_inited) {
        storage_info(HA_STATUS_AUTO);
      }
      {
        mrn::Lock lock(&long_term_share->auto_inc_mutex);
        if (long_term_share->auto_inc_value <= nr) {
          long_term_share->auto_inc_value = nr + 1;
          DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
            long_term_share->auto_inc_value));
        }
      }
    }
  }
  DBUG_RETURN(0);

err:
  for (j = 0; j < table->s->keys; j++) {
    if (j == table->s->primary_key) {
      continue;
    }
    KEY *key_info = &table->key_info[j];
    if ((key_info->flags & HA_NOSAME) && key_id[j] != GRN_ID_NIL) {
      grn_table_delete_by_id(ctx, grn_index_tables[j], key_id[j]);
    }
  }

  if (!error && thd_sql_command(ha_thd()) == SQLCOM_TRUNCATE) {
    MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
    mrn::Lock lock(&long_term_share->auto_inc_mutex);
    long_term_share->auto_inc_value = 0;
    DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
      long_term_share->auto_inc_value));
    long_term_share->auto_inc_inited = false;
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_update_row_index(const uchar *old_data,
                                         const uchar *new_data)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  grn_obj old_key, old_encoded_key, new_key, new_encoded_key;
  GRN_TEXT_INIT(&old_key, 0);
  GRN_TEXT_INIT(&old_encoded_key, 0);
  GRN_TEXT_INIT(&new_key, 0);
  GRN_TEXT_INIT(&new_encoded_key, 0);

  mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
  uint i;
  uint n_keys = table->s->keys;
  mrn_change_encoding(ctx, NULL);
  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &(table->key_info[i]);

    if (KEY_N_KEY_PARTS(key_info) == 1 || key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
      continue;
    }

    grn_obj *index_column = grn_index_columns[i];
    if (!index_column) {
      /* disable keys */
      continue;
    }

    GRN_BULK_REWIND(&old_key);
    grn_bulk_space(ctx, &old_key, key_info->key_length);
    key_copy((uchar *)(GRN_TEXT_VALUE(&old_key)),
             (uchar *)old_data,
             key_info,
             key_info->key_length);
    GRN_BULK_REWIND(&old_encoded_key);
    grn_bulk_reserve(ctx, &old_encoded_key, MRN_MAX_KEY_SIZE);
    uint old_encoded_key_length;
    storage_encode_multiple_column_key(key_info,
                                       (uchar *)(GRN_TEXT_VALUE(&old_key)),
                                       key_info->key_length,
                                       (uchar *)(GRN_TEXT_VALUE(&old_encoded_key)),
                                       &old_encoded_key_length);
    grn_bulk_space(ctx, &old_encoded_key, old_encoded_key_length);

    GRN_BULK_REWIND(&new_key);
    grn_bulk_space(ctx, &new_key, key_info->key_length);
    key_copy((uchar *)(GRN_TEXT_VALUE(&new_key)),
             (uchar *)new_data,
             key_info,
             key_info->key_length);
    GRN_BULK_REWIND(&new_encoded_key);
    grn_bulk_reserve(ctx, &new_encoded_key, MRN_MAX_KEY_SIZE);
    uint new_encoded_key_length;
    storage_encode_multiple_column_key(key_info,
                                       (uchar *)(GRN_TEXT_VALUE(&new_key)),
                                       key_info->key_length,
                                       (uchar *)(GRN_TEXT_VALUE(&new_encoded_key)),
                                       &new_encoded_key_length);
    grn_bulk_space(ctx, &new_encoded_key, new_encoded_key_length);

    grn_rc rc;
    rc = grn_column_index_update(ctx, index_column, record_id, 1,
                                 &old_encoded_key, &new_encoded_key);
    if (rc) {
      error = ER_ERROR_ON_WRITE;
      my_message(error, ctx->errbuf, MYF(0));
      goto err;
    }
  }
err:
  grn_obj_unlink(ctx, &old_key);
  grn_obj_unlink(ctx, &old_encoded_key);
  grn_obj_unlink(ctx, &new_key);
  grn_obj_unlink(ctx, &new_encoded_key);

  DBUG_RETURN(error);
}

int ha_mroonga::storage_update_row_unique_indexes(const uchar *new_data)
{
  int error;
  uint i;
  uint n_keys = table->s->keys;
  MRN_DBUG_ENTER_METHOD();

  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &table->key_info[i];
    if (!(key_info->flags & HA_NOSAME)) {
      continue;
    }

    grn_obj *index_table = grn_index_tables[i];
    if (!index_table) {
      key_id[i] = GRN_ID_NIL;
      del_key_id[i] = GRN_ID_NIL;
      continue;
    }

    grn_obj *index_column = grn_index_columns[i];
    if (!index_column) {
      key_id[i] = GRN_ID_NIL;
      del_key_id[i] = GRN_ID_NIL;
      continue;
    }

    if (
      KEY_N_KEY_PARTS(key_info) == 1 &&
      !bitmap_is_set(table->write_set,
                     key_info->key_part[0].field->field_index)
    ) {
      /* no change */
      key_id[i] = GRN_ID_NIL;
      del_key_id[i] = GRN_ID_NIL;
      continue;
    }

    if ((error = storage_write_row_unique_index(new_data, key_info,
                                                index_table, index_column,
                                                &key_id[i])))
    {
      if (error == HA_ERR_FOUND_DUPP_KEY)
      {
        if (key_id[i] == del_key_id[i]) {
          /* no change */
          key_id[i] = GRN_ID_NIL;
          del_key_id[i] = GRN_ID_NIL;
          continue;
        }
        dup_key = i;
        DBUG_PRINT("info", ("mroonga: different key ID: %d record ID: %d,%d",
          i, key_id[i], del_key_id[i]));
      }
      goto err;
    }
  }
  DBUG_RETURN(0);

err:
  if (i) {
    mrn_change_encoding(ctx, NULL);
    do {
      i--;
      KEY *key_info = &table->key_info[i];
      if ((key_info->flags & HA_NOSAME) && key_id[i] != GRN_ID_NIL) {
        grn_table_delete_by_id(ctx, grn_index_tables[i], key_id[i]);
      }
    } while (i);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::update_row(const uchar *old_data, const uchar *new_data)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_update_row(old_data, new_data);
  } else {
    error = storage_update_row(old_data, new_data);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_delete_row(const uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;
  THD *thd= ha_thd();

  mrn::Operation operation(operations_,
                           "delete",
                           table->s->table_name.str,
                           table->s->table_name.length);

  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  tmp_disable_binlog(thd);
  error = wrap_handler->ha_delete_row(buf);
  reenable_binlog(thd);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);

  if (!error && wrapper_have_target_index()) {
    error = wrapper_delete_row_index(buf);
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_delete_row_index(const uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  if (is_dry_write()) {
    DBUG_PRINT("info", ("mroonga: dry write: ha_mroonga::%s", __FUNCTION__));
    DBUG_RETURN(error);
  }

  mrn_change_encoding(ctx, NULL);
  grn_id record_id;
  error = wrapper_get_record_id((uchar *)buf, &record_id,
                                "failed to get record ID "
                                "for deleting from groonga");
  if (error) {
    DBUG_RETURN(0);
  }

  mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
  uint i;
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    KEY *key_info = &(table->key_info[i]);

    if (!(wrapper_is_target_index(key_info))) {
      continue;
    }

    grn_obj *index_column = grn_index_columns[i];
    if (!index_column) {
      /* disable keys */
      continue;
    }

    uint j;
    for (j = 0; j < KEY_N_KEY_PARTS(key_info); j++) {
      Field *field = key_info->key_part[j].field;

      if (field->is_null())
        continue;

      generic_store_bulk(field, &old_value_buffer);
      grn_rc rc;
      rc = grn_column_index_update(ctx, index_column, record_id, j + 1,
                                   &old_value_buffer, NULL);
      if (rc) {
        error = ER_ERROR_ON_WRITE;
        my_message(error, ctx->errbuf, MYF(0));
        goto err;
      }
    }
  }
err:
  grn_table_delete_by_id(ctx, grn_table, record_id);
  if (ctx->rc) {
    error = ER_ERROR_ON_WRITE;
    my_message(error, ctx->errbuf, MYF(0));
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_delete_row(const uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error;

  if (is_dry_write()) {
    DBUG_PRINT("info", ("mroonga: dry write: ha_mroonga::%s", __FUNCTION__));
    DBUG_RETURN(0);
  }

  mrn::Operation operation(operations_,
                           "delete",
                           table->s->table_name.str,
                           table->s->table_name.length);
  operation.record_target(record_id);

  {
    grn_id referencing_child_table_id = GRN_ID_NIL;
    grn_hash *columns = grn_hash_create(ctx, NULL, sizeof(grn_id), 0,
                                        GRN_OBJ_TABLE_HASH_KEY|GRN_HASH_TINY);
    grn_table_columns(ctx, grn_table, "", 0,
                      reinterpret_cast<grn_obj *>(columns));
    GRN_HASH_EACH_BEGIN(ctx, columns, cursor, id) {
      void *key;
      grn_hash_cursor_get_key(ctx, cursor, &key);
      grn_id column_id = *static_cast<grn_id *>(key);
      grn_obj *column = grn_ctx_at(ctx, column_id);
      if (!column)
        continue;

      if (column->header.type != GRN_COLUMN_INDEX)
        continue;

      grn_ii_cursor *ii_cursor =
        grn_ii_cursor_open(ctx,
                           reinterpret_cast<grn_ii *>(column),
                           record_id,
                           GRN_ID_NIL,
                           GRN_ID_MAX,
                           0,
                           0);
      if (!ii_cursor)
        continue;

      if (grn_ii_cursor_next(ctx, ii_cursor)) {
        referencing_child_table_id = grn_obj_get_range(ctx, column);
      }

      grn_ii_cursor_close(ctx, ii_cursor);

      if (referencing_child_table_id != GRN_ID_NIL)
        break;
    } GRN_HASH_EACH_END(ctx, cursor);
    grn_hash_close(ctx, columns);

    if (referencing_child_table_id != GRN_ID_NIL) {
      grn_obj *referencing_child_table =
        grn_ctx_at(ctx, referencing_child_table_id);
      char name[GRN_TABLE_MAX_KEY_SIZE];
      int name_size;
      name_size = grn_obj_name(ctx,
                               referencing_child_table,
                               name,
                               GRN_TABLE_MAX_KEY_SIZE);
      error = HA_ERR_ROW_IS_REFERENCED;
      GRN_PLUGIN_ERROR(ctx, GRN_INVALID_ARGUMENT,
                       "one or more child rows exist in <%.*s>",
                       name_size,
                       name);
      DBUG_RETURN(error);
    }
  }

  storage_store_fields_for_prep_update(buf, NULL, record_id);
  {
    mrn::Lock lock(&(share->record_mutex), have_unique_index());
    if ((error = storage_prepare_delete_row_unique_indexes(buf, record_id))) {
      DBUG_RETURN(error);
    }
    mrn_change_encoding(ctx, NULL);
    grn_table_delete_by_id(ctx, grn_table, record_id);
    if (ctx->rc) {
      my_message(ER_ERROR_ON_WRITE, ctx->errbuf, MYF(0));
      DBUG_RETURN(ER_ERROR_ON_WRITE);
    }
    if (
      (error = storage_delete_row_index(buf)) ||
      (error = storage_delete_row_unique_indexes())
      ) {
      DBUG_RETURN(error);
    }
  }

  grn_db_touch(ctx, grn_ctx_db(ctx));

  DBUG_RETURN(0);
}

int ha_mroonga::storage_delete_row_index(const uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  grn_obj key, encoded_key;
  GRN_TEXT_INIT(&key, 0);
  GRN_TEXT_INIT(&encoded_key, 0);

  mrn::DebugColumnAccess debug_column_access(table, &table->read_set);
  uint i;
  uint n_keys = table->s->keys;
  mrn_change_encoding(ctx, NULL);
  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &(table->key_info[i]);

    if (KEY_N_KEY_PARTS(key_info) == 1 || key_info->algorithm == HA_KEY_ALG_FULLTEXT) {
      continue;
    }

    grn_obj *index_column = grn_index_columns[i];
    if (!index_column) {
      /* disable keys */
      continue;
    }

    GRN_BULK_REWIND(&key);
    grn_bulk_space(ctx, &key, key_info->key_length);
    key_copy((uchar *)(GRN_TEXT_VALUE(&key)),
             (uchar *)buf,
             key_info,
             key_info->key_length);
    GRN_BULK_REWIND(&encoded_key);
    grn_bulk_reserve(ctx, &encoded_key, MRN_MAX_KEY_SIZE);
    uint encoded_key_length;
    storage_encode_multiple_column_key(key_info,
                                       (uchar *)(GRN_TEXT_VALUE(&key)),
                                       key_info->key_length,
                                       (uchar *)(GRN_TEXT_VALUE(&encoded_key)),
                                       &encoded_key_length);
    grn_bulk_space(ctx, &encoded_key, encoded_key_length);

    grn_rc rc;
    rc = grn_column_index_update(ctx, index_column, record_id, 1,
                                 &encoded_key, NULL);
    if (rc) {
      error = ER_ERROR_ON_WRITE;
      my_message(error, ctx->errbuf, MYF(0));
      goto err;
    }
  }
err:
  grn_obj_unlink(ctx, &encoded_key);
  grn_obj_unlink(ctx, &key);

  DBUG_RETURN(error);
}

int ha_mroonga::storage_delete_row_unique_index(grn_obj *index_table,
                                                grn_id del_key_id)
{
  MRN_DBUG_ENTER_METHOD();
  grn_rc rc = grn_table_delete_by_id(ctx, index_table, del_key_id);
  if (rc) {
    my_message(ER_ERROR_ON_WRITE, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_WRITE);
  }
  DBUG_RETURN(0);
}

int ha_mroonga::storage_delete_row_unique_indexes()
{
  int error = 0, tmp_error;
  uint i;
  uint n_keys = table->s->keys;
  MRN_DBUG_ENTER_METHOD();

  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &table->key_info[i];
    if ((!(key_info->flags & HA_NOSAME)) || del_key_id[i] == GRN_ID_NIL) {
      continue;
    }

    grn_obj *index_table = grn_index_tables[i];
    if ((tmp_error = storage_delete_row_unique_index(index_table,
                                                     del_key_id[i])))
    {
      error = tmp_error;
    }
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_prepare_delete_row_unique_index(const uchar *buf,
                                                        grn_id record_id,
                                                        KEY *key_info,
                                                        grn_obj *index_table,
                                                        grn_obj *index_column,
                                                        grn_id *del_key_id)
{
  const void *ukey = NULL;
  uint32 ukey_size = 0;
  MRN_DBUG_ENTER_METHOD();
  if (KEY_N_KEY_PARTS(key_info) == 1) {
    GRN_BULK_REWIND(&key_buffer);
    grn_obj_get_value(ctx, index_column, record_id, &key_buffer);
    ukey = GRN_TEXT_VALUE(&key_buffer);
    ukey_size = GRN_TEXT_LEN(&key_buffer);
  } else {
    mrn_change_encoding(ctx, NULL);
    uchar key[MRN_MAX_KEY_SIZE];
    key_copy(key, (uchar *) buf, key_info, key_info->key_length);
    grn_bulk_reserve(ctx, &key_buffer, MRN_MAX_KEY_SIZE);
    ukey = GRN_TEXT_VALUE(&key_buffer);
    storage_encode_multiple_column_key(key_info,
                                       key, key_info->key_length,
                                       (uchar *)ukey, (uint *)&ukey_size);
  }
  *del_key_id = grn_table_get(ctx, index_table, ukey, ukey_size);
  DBUG_RETURN(0);
}

int ha_mroonga::storage_prepare_delete_row_unique_indexes(const uchar *buf,
                                                          grn_id record_id)
{
  int error = 0, tmp_error;
  uint i;
  uint n_keys = table->s->keys;
  MRN_DBUG_ENTER_METHOD();

  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &table->key_info[i];
    if (!(key_info->flags & HA_NOSAME)) {
      continue;
    }

    grn_obj *index_table = grn_index_tables[i];
    if (!index_table) {
      del_key_id[i] = GRN_ID_NIL;
      continue;
    }

    grn_obj *index_column;
    if (KEY_N_KEY_PARTS(key_info) == 1) {
      Field *field = key_info->key_part[0].field;
      mrn_change_encoding(ctx, field->charset());
      index_column = grn_columns[field->field_index];
    } else {
      mrn_change_encoding(ctx, NULL);
      index_column = grn_index_columns[i];
    }
    if ((tmp_error = storage_prepare_delete_row_unique_index(buf, record_id,
                                                             key_info,
                                                             index_table,
                                                             index_column,
                                                             &del_key_id[i])))
    {
      error = tmp_error;
    }
  }
  DBUG_RETURN(error);
}

int ha_mroonga::delete_row(const uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_delete_row(buf);
  } else {
    error = storage_delete_row(buf);
  }
  DBUG_RETURN(error);
}

uint ha_mroonga::wrapper_max_supported_key_parts() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(MAX_REF_PARTS);
}

uint ha_mroonga::storage_max_supported_key_parts() const
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(MAX_REF_PARTS);
}

uint ha_mroonga::max_supported_key_parts() const
{
  MRN_DBUG_ENTER_METHOD();

  uint parts;
  if (!share && !analyzed_for_create &&
    (
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_TABLE ||
      thd_sql_command(ha_thd()) == SQLCOM_CREATE_INDEX ||
      thd_sql_command(ha_thd()) == SQLCOM_ALTER_TABLE
    )
  ) {
    create_share_for_create();
  }
  if (analyzed_for_create && share_for_create.wrapper_mode) {
    parts = wrapper_max_supported_key_parts();
  } else if (wrap_handler && share && share->wrapper_mode) {
    parts = wrapper_max_supported_key_parts();
  } else {
    parts = storage_max_supported_key_parts();
  }

  DBUG_RETURN(parts);
}

ha_rows ha_mroonga::wrapper_records_in_range(uint key_nr,
                                             const key_range *range_min,
                                             const key_range *range_max,
                                             page_range *pages)
{
  ha_rows row_count;
  MRN_DBUG_ENTER_METHOD();
  KEY *key_info = &(table->s->key_info[key_nr]);
  if (mrn_is_geo_key(key_info)) {
    row_count = generic_records_in_range_geo(key_nr, range_min, range_max);
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    row_count = wrap_handler->records_in_range(key_nr, range_min, range_max,
                                               pages);
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(row_count);
}

ha_rows ha_mroonga::storage_records_in_range(uint key_nr,
                                             const key_range *range_min,
                                             const key_range *range_max,
                                             page_range *pages)
{
  MRN_DBUG_ENTER_METHOD();
  int flags = 0;
  uint size_min = 0, size_max = 0;
  ha_rows row_count = 0;
  uchar *key_min = NULL, *key_max = NULL;
  uchar key_min_entity[MRN_MAX_KEY_SIZE];
  uchar key_max_entity[MRN_MAX_KEY_SIZE];
  KEY *key_info = &(table->s->key_info[key_nr]);
  bool is_multiple_column_index = KEY_N_KEY_PARTS(key_info) > 1;

  if (is_multiple_column_index) {
    mrn_change_encoding(ctx, NULL);
    if (range_min && range_max &&
        range_min->length == range_max->length &&
        memcmp(range_min->key, range_max->key, range_min->length) == 0) {
      flags |= GRN_CURSOR_PREFIX;
      key_min = key_min_entity;
      storage_encode_multiple_column_key(key_info,
                                         range_min->key, range_min->length,
                                         key_min, &size_min);
    } else {
      key_min = key_min_entity;
      key_max = key_max_entity;
      storage_encode_multiple_column_key_range(key_info,
                                               range_min, range_max,
                                               key_min, &size_min,
                                               key_max, &size_max);
    }
  } else if (mrn_is_geo_key(key_info)) {
    mrn_change_encoding(ctx, key_info->key_part->field->charset());
    row_count = generic_records_in_range_geo(key_nr, range_min, range_max);
    DBUG_RETURN(row_count);
  } else {
    Field *field = key_info->key_part[0].field;
    const char *column_name = field->field_name.str;
    mrn_change_encoding(ctx, field->charset());

    if (strcmp(MRN_COLUMN_NAME_ID, column_name) == 0) {
      DBUG_RETURN((ha_rows)1);
    }

    if (range_min) {
      key_min = key_min_entity;
      storage_encode_key(field, range_min->key, key_min, &size_min);
      if (size_min == 0) {
        DBUG_RETURN(HA_POS_ERROR);
      }
    }
    if (range_max) {
      key_max = key_max_entity;
      storage_encode_key(field, range_max->key, key_max, &size_max);
      if (size_max == 0) {
        DBUG_RETURN(HA_POS_ERROR);
      }
    }
  }

  if (range_min) {
    DBUG_PRINT("info", ("mroonga: range_min->flag=%u", range_min->flag));
    if (range_min->flag == HA_READ_AFTER_KEY) {
      flags |= GRN_CURSOR_GT;
    }
  }
  if (range_max) {
    DBUG_PRINT("info", ("mroonga: range_min->flag=%u", range_max->flag));
    if (range_max->flag == HA_READ_BEFORE_KEY) {
      flags |= GRN_CURSOR_LT;
    }
  }

  int cursor_limit = THDVAR(ha_thd(), max_n_records_for_estimate);
  uint pkey_nr = table->s->primary_key;
  if (key_nr == pkey_nr) {
    DBUG_PRINT("info", ("mroonga: use primary key"));
    grn_table_cursor *cursor;
    cursor = grn_table_cursor_open(ctx, grn_table,
                                   key_min, size_min,
                                   key_max, size_max,
                                   0, cursor_limit, flags);
    while (grn_table_cursor_next(ctx, cursor) != GRN_ID_NIL) {
      row_count++;
    }
    grn_table_cursor_close(ctx, cursor);
  } else {
    if (is_multiple_column_index) {
      DBUG_PRINT("info", ("mroonga: use multiple column key%u", key_nr));
    } else {
      DBUG_PRINT("info", ("mroonga: use key%u", key_nr));
    }

    grn_table_cursor *cursor;
    cursor = grn_table_cursor_open(ctx, grn_index_tables[key_nr],
                                   key_min, size_min,
                                   key_max, size_max,
                                   0, cursor_limit, flags);
    grn_obj *index_column = grn_index_columns[key_nr];
    grn_ii *ii = reinterpret_cast<grn_ii *>(index_column);
    row_count = grn_ii_estimate_size_for_lexicon_cursor(ctx, ii, cursor);
    grn_table_cursor_close(ctx, cursor);

    unsigned int max_n_lexicon_records =
      grn_table_size(ctx, grn_index_tables[key_nr]);
    if (cursor_limit >= 0 &&
        static_cast<unsigned int>(cursor_limit) < max_n_lexicon_records) {
      row_count++;
    }
  }
  DBUG_RETURN(row_count);
}

ha_rows ha_mroonga::generic_records_in_range_geo(uint key_nr,
                                                 const key_range *range_min,
                                                 const key_range *range_max)
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows row_count;
  int error;

  if (!range_min) {
    DBUG_PRINT("info",
               ("mroonga: range min is missing for geometry range search"));
    DBUG_RETURN(HA_POS_ERROR);
  }
  if (range_max) {
    DBUG_PRINT("info",
               ("mroonga: range max is specified for geometry range search"));
    DBUG_RETURN(HA_POS_ERROR);
  }
  error = mrn_change_encoding(ctx,
    table->key_info[key_nr].key_part->field->charset());
  if (error)
    DBUG_RETURN(error);
  if (!(range_min->flag & HA_READ_MBR_CONTAIN)) {
    push_warning_unsupported_spatial_index_search(range_min->flag);
    row_count = grn_table_size(ctx, grn_table);
    DBUG_RETURN(row_count);
  }

  geo_store_rectangle(range_min->key);
  row_count = grn_geo_estimate_in_rectangle(ctx,
                                            grn_index_columns[key_nr],
                                            &top_left_point,
                                            &bottom_right_point);
  DBUG_RETURN(row_count);
}

ha_rows ha_mroonga::records_in_range(uint key_nr, const key_range *range_min,
                                     const key_range *range_max,
                                     page_range *pages)
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows row_count = 0;
  if (share->wrapper_mode)
  {
    row_count = wrapper_records_in_range(key_nr, range_min, range_max, pages);
  } else {
    row_count = storage_records_in_range(key_nr, range_min, range_max, pages);
  }
  DBUG_PRINT("info", ("mroonga: row_count=%" MRN_HA_ROWS_FORMAT, row_count));
  DBUG_RETURN(row_count);
}

int ha_mroonga::wrapper_index_init(uint idx, bool sorted)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  KEY *key_info = &(table->s->key_info[idx]);
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (!mrn_is_geo_key(key_info) && key_info->algorithm != HA_KEY_ALG_FULLTEXT)
  {
    error = wrap_handler->ha_index_init(share->wrap_key_nr[idx], sorted);
  } else {
    error = wrap_handler->ha_index_init(share->wrap_primary_key, sorted);
  }
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_init(uint idx, bool sorted)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(0);
}

int ha_mroonga::index_init(uint idx, bool sorted)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_PRINT("info", ("mroonga: idx=%u", idx));
  active_index = idx;
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_init(idx, sorted);
  } else {
    error = storage_index_init(idx, sorted);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_index_end()
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_index_or_rnd_end();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_end()
{
  MRN_DBUG_ENTER_METHOD();
  clear_cursor();
  clear_cursor_geo();
  DBUG_RETURN(0);
}

int ha_mroonga::index_end()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_end();
  } else {
    error = storage_index_end();
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_index_read_map(uchar *buf, const uchar *key,
                                       key_part_map keypart_map,
                                       enum ha_rkey_function find_flag)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  KEY *key_info = &(table->key_info[active_index]);
  if (mrn_is_geo_key(key_info)) {
    clear_cursor_geo();
    error = generic_geo_open_cursor(key, find_flag);
    if (!error) {
      error = wrapper_get_next_geo_record(buf);
    }
    DBUG_RETURN(error);
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    if (fulltext_searching)
      set_pk_bitmap();
#ifdef MRN_HANDLER_HAVE_HA_INDEX_READ_MAP
    error = wrap_handler->ha_index_read_map(buf, key, keypart_map, find_flag);
#else
    error = wrap_handler->index_read_map(buf, key, keypart_map, find_flag);
#endif
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_read_map(uchar *buf, const uchar *key,
                                       key_part_map keypart_map,
                                       enum ha_rkey_function find_flag)
{
  MRN_DBUG_ENTER_METHOD();
  check_count_skip(keypart_map);

  int error = 0;

  uint key_nr = active_index;
  KEY *key_info = &(table->key_info[key_nr]);
  int flags = 0;
  uint size_min = 0, size_max = 0;
  uchar *key_min = NULL, *key_max = NULL;
  uchar key_min_entity[MRN_MAX_KEY_SIZE];
  uchar key_max_entity[MRN_MAX_KEY_SIZE];

  clear_cursor();
  clear_cursor_geo();
  clear_empty_value_records();

  switch (find_flag) {
  case HA_READ_BEFORE_KEY:
    flags |= GRN_CURSOR_LT | GRN_CURSOR_DESCENDING;
    break;
  case HA_READ_PREFIX_LAST:
    flags |= GRN_CURSOR_PREFIX | GRN_CURSOR_DESCENDING;
    break;
  case HA_READ_PREFIX_LAST_OR_PREV:
    flags |= GRN_CURSOR_LE | GRN_CURSOR_DESCENDING;
    break;
  case HA_READ_AFTER_KEY:
    flags |= GRN_CURSOR_GT | GRN_CURSOR_ASCENDING;
    break;
  case HA_READ_KEY_OR_NEXT:
    flags |= GRN_CURSOR_GE | GRN_CURSOR_ASCENDING;
    break;
  case HA_READ_KEY_EXACT:
    flags |= GRN_CURSOR_LE | GRN_CURSOR_GE;
    break;
  default:
    break;
  }

  bool is_multiple_column_index = KEY_N_KEY_PARTS(key_info) > 1;
  if (is_multiple_column_index) {
    mrn_change_encoding(ctx, NULL);
    uint key_length =
      mrn_calculate_key_len(table, active_index, key, keypart_map);
    DBUG_PRINT("info",
               ("mroonga: multiple column index: "
                "search key length=<%u>, "
                "multiple column index key length=<%u>",
                key_length, key_info->key_length));
    if (key_length == key_info->key_length) {
      switch (find_flag) {
      case HA_READ_BEFORE_KEY:
      case HA_READ_PREFIX_LAST_OR_PREV:
        key_max = key_max_entity;
        storage_encode_multiple_column_key(key_info,
                                           key, key_length,
                                           key_max, &size_max);
        break;
      case HA_READ_PREFIX_LAST:
        key_min = key_min_entity;
        storage_encode_multiple_column_key(key_info,
                                           key, key_length,
                                           key_min, &size_min);
        break;
      default:
        key_min = key_min_entity;
        storage_encode_multiple_column_key(key_info,
                                           key, key_length,
                                           key_min, &size_min);
        if (find_flag == HA_READ_KEY_EXACT) {
          key_max = key_min;
          size_max = size_min;
        }
        break;
      }
    } else {
      const uchar *prev_key = NULL;
      uint prev_key_length = 0;
      if ((keypart_map >> 1) > 0) {
        prev_key = key;
        prev_key_length =
          mrn_calculate_key_len(table, active_index, key, keypart_map >> 1);
      }
      switch (find_flag) {
      case HA_READ_BEFORE_KEY:
        if (prev_key) {
          flags |= GRN_CURSOR_GE;
          key_min = key_min_entity;
          storage_encode_multiple_column_key_range(key_info,
                                                   prev_key, prev_key_length,
                                                   NULL, 0,
                                                   key_min, &size_min,
                                                   NULL, NULL);
        }
        key_max = key_max_entity;
        storage_encode_multiple_column_key_range(key_info,
                                                 key, key_length,
                                                 NULL, 0,
                                                 key_max, &size_max,
                                                 NULL, NULL);
        break;
      case HA_READ_PREFIX_LAST:
        key_min = key_min_entity;
        storage_encode_multiple_column_key(key_info,
                                           key, key_length,
                                           key_min, &size_min);
        break;
      case HA_READ_PREFIX_LAST_OR_PREV:
        if (prev_key) {
          flags |= GRN_CURSOR_GE;
          key_min = key_min_entity;
          storage_encode_multiple_column_key_range(key_info,
                                                   prev_key, prev_key_length,
                                                   NULL, 0,
                                                   key_min, &size_min,
                                                   NULL, NULL);
        }
        key_max = key_max_entity;
        storage_encode_multiple_column_key_range(key_info,
                                                 NULL, 0,
                                                 key, key_length,
                                                 NULL, NULL,
                                                 key_max, &size_max);
        break;
      case HA_READ_AFTER_KEY:
        key_min = key_min_entity;
        storage_encode_multiple_column_key_range(key_info,
                                                 NULL, 0,
                                                 key, key_length,
                                                 NULL, NULL,
                                                 key_min, &size_min);
        if (prev_key) {
          flags |= GRN_CURSOR_LE;
          key_max = key_max_entity;
          storage_encode_multiple_column_key_range(key_info,
                                                   NULL, 0,
                                                   prev_key, prev_key_length,
                                                   NULL, NULL,
                                                   key_max, &size_max);
        }
        break;
      case HA_READ_KEY_OR_NEXT:
        key_min = key_min_entity;
        storage_encode_multiple_column_key_range(key_info,
                                                 key, key_length,
                                                 NULL, 0,
                                                 key_min, &size_min,
                                                 NULL, NULL);
        if (prev_key) {
          flags |= GRN_CURSOR_LE;
          key_max = key_max_entity;
          storage_encode_multiple_column_key_range(key_info,
                                                   NULL, 0,
                                                   prev_key, prev_key_length,
                                                   NULL, NULL,
                                                   key_max, &size_max);
        }
        break;
      case HA_READ_KEY_EXACT:
        key_min = key_min_entity;
        key_max = key_max_entity;
        storage_encode_multiple_column_key_range(key_info,
                                                 key, key_length,
                                                 key, key_length,
                                                 key_min, &size_min,
                                                 key_max, &size_max);
      default:
        break;
      }
    }
  } else if (mrn_is_geo_key(key_info)) {
    error = mrn_change_encoding(ctx, key_info->key_part->field->charset());
    if (error)
      DBUG_RETURN(error);
    error = generic_geo_open_cursor(key, find_flag);
    if (!error) {
      error = storage_get_next_record(buf);
    }
    DBUG_RETURN(error);
  } else {
    Field *field = key_info->key_part[0].field;
    error = mrn_change_encoding(ctx, field->charset());
    if (error)
      DBUG_RETURN(error);

    if (find_flag == HA_READ_KEY_EXACT) {
      const char *column_name = field->field_name.str;

      key_min = key_min_entity;
      key_max = key_min_entity;
      storage_encode_key(field, key, key_min, &size_min);
      size_max = size_min;
      // for _id
      if (strcmp(MRN_COLUMN_NAME_ID, column_name) == 0) {
        grn_id found_record_id = *((grn_id *)key_min);
        if (grn_table_at(ctx, grn_table, found_record_id) != GRN_ID_NIL) { // found
          storage_store_fields(buf, found_record_id);
          table->status = 0;
          record_id = found_record_id;
          DBUG_RETURN(0);
        } else {
          table->status = STATUS_NOT_FOUND;
          DBUG_RETURN(HA_ERR_END_OF_FILE);
        }
      }
    } else if (find_flag == HA_READ_BEFORE_KEY ||
               find_flag == HA_READ_PREFIX_LAST_OR_PREV) {
      key_max = key_max_entity;
      storage_encode_key(field, key, key_max_entity, &size_max);
    } else {
      key_min = key_min_entity;
      storage_encode_key(field, key, key_min_entity, &size_min);
    }
  }

  uint pkey_nr = table->s->primary_key;
  if (key_nr == pkey_nr) {
    DBUG_PRINT("info", ("mroonga: use primary key"));
    cursor = grn_table_cursor_open(ctx, grn_table,
                                   key_min, size_min,
                                   key_max, size_max,
                                   0, -1, flags);
  } else {
    bool is_empty_value_records_search = false;
    if (is_multiple_column_index) {
      DBUG_PRINT("info", ("mroonga: use multiple column key%u", key_nr));
    } else if (flags == 0 && size_min == 0 && size_max == 0) {
      is_empty_value_records_search = true;
      DBUG_PRINT("info",
                 ("mroonga: use table scan for searching empty value records"));
    } else {
      DBUG_PRINT("info", ("mroonga: use key%u", key_nr));
    }
    if (is_empty_value_records_search) {
      grn_obj *expression, *expression_variable;
      GRN_EXPR_CREATE_FOR_QUERY(ctx, grn_table,
                                expression, expression_variable);
      grn_obj *target_column =
        grn_columns[key_info->key_part->field->field_index];
      grn_expr_append_const(ctx, expression, target_column, GRN_OP_GET_VALUE, 1);
      grn_obj empty_value;
      GRN_TEXT_INIT(&empty_value, 0);
      grn_expr_append_obj(ctx, expression, &empty_value, GRN_OP_PUSH, 1);
      grn_expr_append_op(ctx, expression, GRN_OP_EQUAL, 2);

      empty_value_records =
        grn_table_create(ctx, NULL, 0, NULL,
                         GRN_OBJ_TABLE_HASH_KEY | GRN_OBJ_WITH_SUBREC,
                         grn_table, 0);
      grn_table_select(ctx, grn_table, expression, empty_value_records,
                       GRN_OP_OR);
      grn_obj_unlink(ctx, expression);
      grn_obj_unlink(ctx, &empty_value);

      empty_value_records_cursor =
        grn_table_cursor_open(ctx, empty_value_records,
                              NULL, 0, NULL, 0,
                              0, -1, flags);
    } else {
      index_table_cursor = grn_table_cursor_open(ctx, grn_index_tables[key_nr],
                                                 key_min, size_min,
                                                 key_max, size_max,
                                                 0, -1, flags);
      cursor = grn_index_cursor_open(ctx, index_table_cursor,
                                     grn_index_columns[key_nr],
                                     0, GRN_ID_MAX, 0);
    }
  }
  if (ctx->rc) {
    my_message(ER_ERROR_ON_READ, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_READ);
  }
  error = storage_get_next_record(buf);
  DBUG_RETURN(error);
}

int ha_mroonga::index_read_map(uchar *buf, const uchar *key,
                               key_part_map keypart_map,
                               enum ha_rkey_function find_flag)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_read_map(buf, key, keypart_map, find_flag);
  } else {
    error = storage_index_read_map(buf, key, keypart_map, find_flag);
  }
  DBUG_PRINT("info", ("mroonga: error=%d", error));
  DBUG_RETURN(error);
}

#ifdef MRN_HANDLER_HAVE_INDEX_READ_LAST_MAP
int ha_mroonga::wrapper_index_read_last_map(uchar *buf, const uchar *key,
                                            key_part_map keypart_map)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
#  ifdef MRN_HANDLER_HAVE_HA_INDEX_READ_LAST_MAP
  error = wrap_handler->ha_index_read_last_map(buf, key, keypart_map);
#  else
  error = wrap_handler->index_read_last_map(buf, key, keypart_map);
#  endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_read_last_map(uchar *buf, const uchar *key,
                                            key_part_map keypart_map)
{
  MRN_DBUG_ENTER_METHOD();
  uint key_nr = active_index;
  KEY *key_info = &(table->key_info[key_nr]);

  int flags = GRN_CURSOR_DESCENDING, error;
  uint size_min = 0, size_max = 0;
  uchar *key_min = NULL, *key_max = NULL;
  uchar key_min_entity[MRN_MAX_KEY_SIZE];

  clear_cursor();

  bool is_multiple_column_index = KEY_N_KEY_PARTS(key_info) > 1;
  if (is_multiple_column_index) {
    mrn_change_encoding(ctx, NULL);
    flags |= GRN_CURSOR_PREFIX;
    uint key_length =
      mrn_calculate_key_len(table, active_index, key, keypart_map);
    key_min = key_min_entity;
    storage_encode_multiple_column_key(key_info,
                                       key, key_length,
                                       key_min, &size_min);
  } else {
    Field *field = key_info->key_part[0].field;
    error = mrn_change_encoding(ctx, field->charset());
    if (error)
      DBUG_RETURN(error);

    key_min = key_min_entity;
    key_max = key_min_entity;
    storage_encode_key(field, key, key_min, &size_min);
    size_max = size_min;
  }

  uint pkey_nr = table->s->primary_key;
  if (key_nr == pkey_nr) {
    DBUG_PRINT("info", ("mroonga: use primary key"));
    cursor = grn_table_cursor_open(ctx, grn_table,
                                   key_min, size_min, key_max, size_max,
                                   0, -1, flags);
  } else {
    if (is_multiple_column_index) {
      DBUG_PRINT("info", ("mroonga: use multiple column key%u", key_nr));
    } else {
      DBUG_PRINT("info", ("mroonga: use key%u", key_nr));
    }
    index_table_cursor = grn_table_cursor_open(ctx, grn_index_tables[key_nr],
                                               key_min, size_min,
                                               key_max, size_max,
                                               0, -1, flags);
    cursor = grn_index_cursor_open(ctx, index_table_cursor,
                                   grn_index_columns[key_nr],
                                   0, GRN_ID_MAX, 0);
  }
  if (ctx->rc) {
    my_message(ER_ERROR_ON_READ, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_READ);
  }
  error = storage_get_next_record(buf);
  DBUG_RETURN(error);
}

int ha_mroonga::index_read_last_map(uchar *buf, const uchar *key,
                                    key_part_map keypart_map)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_read_last_map(buf, key, keypart_map);
  } else {
    error = storage_index_read_last_map(buf, key, keypart_map);
  }
  DBUG_RETURN(error);
}
#endif

int ha_mroonga::wrapper_index_next(uchar *buf)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  KEY *key_info = &(table->key_info[active_index]);
  if (mrn_is_geo_key(key_info)) {
    error = wrapper_get_next_geo_record(buf);
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    if (fulltext_searching)
      set_pk_bitmap();
#ifdef MRN_HANDLER_HAVE_HA_INDEX_NEXT
    error = wrap_handler->ha_index_next(buf);
#else
    error = wrap_handler->index_next(buf);
#endif
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_next(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = storage_get_next_record(buf);
  DBUG_RETURN(error);
}

int ha_mroonga::index_next(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_next(buf);
  } else {
    error = storage_index_next(buf);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_index_prev(uchar *buf)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  KEY *key_info = &(table->key_info[active_index]);
  if (mrn_is_geo_key(key_info)) {
    error = wrapper_get_next_geo_record(buf);
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    if (fulltext_searching)
      set_pk_bitmap();
#ifdef MRN_HANDLER_HAVE_HA_INDEX_NEXT
    error = wrap_handler->ha_index_prev(buf);
#else
    error = wrap_handler->index_prev(buf);
#endif
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_prev(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = storage_get_next_record(buf);
  DBUG_RETURN(error);
}

int ha_mroonga::index_prev(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_prev(buf);
  } else {
    error = storage_index_prev(buf);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_index_first(uchar *buf)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
#ifdef MRN_HANDLER_HAVE_HA_INDEX_FIRST
  error = wrap_handler->ha_index_first(buf);
#else
  error = wrap_handler->index_first(buf);
#endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_first(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  clear_cursor();
  int flags = GRN_CURSOR_ASCENDING;
  uint pkey_nr = table->s->primary_key;
  mrn_change_encoding(ctx, NULL);
  if (active_index == pkey_nr) {
    DBUG_PRINT("info", ("mroonga: use primary key"));
    cursor = grn_table_cursor_open(ctx, grn_table, NULL, 0, NULL, 0,
                                   0, -1, flags);
  } else {
    if (KEY_N_KEY_PARTS(&(table->key_info[active_index])) > 1) {
      DBUG_PRINT("info", ("mroonga: use multiple column key%u", active_index));
    } else {
      DBUG_PRINT("info", ("mroonga: use key%u", active_index));
    }
    index_table_cursor = grn_table_cursor_open(ctx,
                                               grn_index_tables[active_index],
                                               NULL, 0,
                                               NULL, 0,
                                               0, -1, flags);
    cursor = grn_index_cursor_open(ctx, index_table_cursor,
                                   grn_index_columns[active_index],
                                   0, GRN_ID_MAX, 0);
  }
  if (ctx->rc) {
    my_message(ER_ERROR_ON_READ, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_READ);
  }
  int error = storage_get_next_record(buf);
  DBUG_RETURN(error);
}

int ha_mroonga::index_first(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_first(buf);
  } else {
    error = storage_index_first(buf);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_index_last(uchar *buf)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
#ifdef MRN_HANDLER_HAVE_HA_INDEX_LAST
  error = wrap_handler->ha_index_last(buf);
#else
  error = wrap_handler->index_last(buf);
#endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_last(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  clear_cursor();
  int flags = GRN_CURSOR_DESCENDING;
  uint pkey_nr = table->s->primary_key;
  mrn_change_encoding(ctx, NULL);
  if (active_index == pkey_nr) {
    DBUG_PRINT("info", ("mroonga: use primary key"));
    cursor = grn_table_cursor_open(ctx, grn_table, NULL, 0, NULL, 0,
                                   0, -1, flags);
  } else {
    if (KEY_N_KEY_PARTS(&(table->key_info[active_index])) > 1) {
      DBUG_PRINT("info", ("mroonga: use multiple column key%u", active_index));
    } else {
      DBUG_PRINT("info", ("mroonga: use key%u", active_index));
    }
    index_table_cursor = grn_table_cursor_open(ctx,
                                               grn_index_tables[active_index],
                                               NULL, 0,
                                               NULL, 0,
                                               0, -1, flags);
    cursor = grn_index_cursor_open(ctx, index_table_cursor,
                                   grn_index_columns[active_index],
                                   0, GRN_ID_MAX, 0);
  }
  if (ctx->rc) {
    my_message(ER_ERROR_ON_READ, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_READ);
  }
  int error = storage_get_next_record(buf);
  DBUG_RETURN(error);
}

int ha_mroonga::index_last(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_last(buf);
  } else {
    error = storage_index_last(buf);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_index_next_same(uchar *buf, const uchar *key,
                                        uint keylen)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  KEY *key_info = &(table->s->key_info[active_index]);
  if (mrn_is_geo_key(key_info)) {
    error = wrapper_get_next_geo_record(buf);
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    if (fulltext_searching)
      set_pk_bitmap();
#ifdef MRN_HANDLER_HAVE_HA_INDEX_NEXT_SAME
    error = wrap_handler->ha_index_next_same(buf, key, keylen);
#else
    error = wrap_handler->index_next_same(buf, key, keylen);
#endif
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_index_next_same(uchar *buf, const uchar *key,
                                        uint keylen)
{
  MRN_DBUG_ENTER_METHOD();
  int error = storage_get_next_record(count_skip ? NULL : buf);
  DBUG_RETURN(error);
}

int ha_mroonga::index_next_same(uchar *buf, const uchar *key, uint keylen)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_index_next_same(buf, key, keylen);
  } else {
    error = storage_index_next_same(buf, key, keylen);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::generic_ft_init()
{
  MRN_DBUG_ENTER_METHOD();
  struct st_mrn_ft_info *mrn_ft_info =
    reinterpret_cast<struct st_mrn_ft_info *>(ft_handler);
  GRN_CTX_SET_ENCODING(ctx, mrn_ft_info->encoding);

  int error = 0;
  if (sorted_result) {
    mrn_ft_info->cursor = grn_table_cursor_open(ctx, sorted_result,
                                                NULL, 0, NULL, 0,
                                                0, -1, 0);
  } else {
    mrn_ft_info->cursor = grn_table_cursor_open(ctx, mrn_ft_info->result,
                                                NULL, 0, NULL, 0,
                                                0, -1, 0);
  }
  if (ctx->rc) {
    error = ER_ERROR_ON_READ;
    my_message(error, ctx->errbuf, MYF(0));
  } else {
    if (sorted_result) {
      if (grn_table->header.type == GRN_TABLE_NO_KEY) {
        mrn_ft_info->id_accessor = grn_obj_column(ctx, sorted_result,
                                                  MRN_COLUMN_NAME_ID,
                                                  strlen(MRN_COLUMN_NAME_ID));
      } else {
        mrn_ft_info->key_accessor = grn_obj_column(ctx, sorted_result,
                                                   MRN_COLUMN_NAME_KEY,
                                                   strlen(MRN_COLUMN_NAME_KEY));
      }
    } else {
      mrn_ft_info->key_accessor = grn_obj_column(ctx, mrn_ft_info->result,
                                                 MRN_COLUMN_NAME_KEY,
                                                 strlen(MRN_COLUMN_NAME_KEY));
    }
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_ft_init()
{
  MRN_DBUG_ENTER_METHOD();
  int error = generic_ft_init();
  DBUG_RETURN(error);
}

int ha_mroonga::storage_ft_init()
{
  MRN_DBUG_ENTER_METHOD();
  int error = generic_ft_init();
  record_id = GRN_ID_NIL;
  DBUG_RETURN(error);
}

int ha_mroonga::ft_init()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_ft_init();
  } else {
    error = storage_ft_init();
  }
  DBUG_RETURN(error);
}

void ha_mroonga::generic_ft_init_ext_add_conditions_fast_order_limit(
  struct st_mrn_ft_info *info, grn_obj *expression)
{
  MRN_DBUG_ENTER_METHOD();

  Item *where =
    MRN_SELECT_LEX_GET_WHERE_COND(table->pos_in_table_list->select_lex);

  bool is_storage_mode = !(share->wrapper_mode);
  mrn::ConditionConverter converter(info->ctx, grn_table, is_storage_mode);
  converter.convert(where, expression);

  DBUG_VOID_RETURN;
}

grn_rc ha_mroonga::generic_ft_init_ext_prepare_expression_in_boolean_mode(
  struct st_mrn_ft_info *info,
  String *key,
  grn_obj *index_column,
  grn_obj *match_columns,
  grn_obj *expression)
{
  MRN_DBUG_ENTER_METHOD();

  mrn::QueryParser query_parser(info->ctx,
                                ha_thd(),
                                expression,
                                index_column,
                                KEY_N_KEY_PARTS(info->key_info),
                                match_columns);
  grn_rc rc = query_parser.parse(key->ptr(), key->length());

  DBUG_RETURN(rc);
}

grn_rc ha_mroonga::generic_ft_init_ext_prepare_expression_in_normal_mode(
  struct st_mrn_ft_info *info,
  String *key,
  grn_obj *index_column,
  grn_obj *match_columns,
  grn_obj *expression)
{
  MRN_DBUG_ENTER_METHOD();

  grn_rc rc = GRN_SUCCESS;

  grn_obj query;
  GRN_TEXT_INIT(&query, GRN_OBJ_DO_SHALLOW_COPY);
  GRN_TEXT_SET(info->ctx, &query, key->ptr(), key->length());
  grn_expr_append_obj(info->ctx, match_columns, index_column, GRN_OP_PUSH, 1);
  grn_expr_append_obj(info->ctx, expression, match_columns, GRN_OP_PUSH, 1);
  grn_expr_append_const(info->ctx, expression, &query, GRN_OP_PUSH, 1);
  grn_expr_append_op(info->ctx, expression, GRN_OP_SIMILAR, 2);
  grn_obj_unlink(info->ctx, &query);

  DBUG_RETURN(rc);
}

struct st_mrn_ft_info *ha_mroonga::generic_ft_init_ext_select(uint flags,
                                                              uint key_nr,
                                                              String *key)
{
  MRN_DBUG_ENTER_METHOD();

  struct st_mrn_ft_info *info = new st_mrn_ft_info();
  info->mroonga = this;
  info->ctx = ctx;
  mrn_change_encoding(info->ctx,
                      table->key_info[key_nr].key_part->field->charset());
  info->encoding = GRN_CTX_GET_ENCODING(info->ctx);
  info->table = grn_table;
  info->result = grn_table_create(info->ctx, NULL, 0, NULL,
                                  GRN_OBJ_TABLE_HASH_KEY | GRN_OBJ_WITH_SUBREC,
                                  grn_table, 0);
  if (!info->result) {
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "[mroonga][ft-init] failed to create a table "
             "to store matched records for one search: <%s>",
             ctx->errbuf);
    my_message(ER_ERROR_ON_READ, error_message, MYF(0));
    GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
    delete info;
    DBUG_RETURN(NULL);
  }

  info->score_column = grn_obj_column(info->ctx, info->result,
                                      MRN_COLUMN_NAME_SCORE,
                                      strlen(MRN_COLUMN_NAME_SCORE));
  GRN_TEXT_INIT(&(info->key), 0);
  grn_bulk_space(info->ctx, &(info->key), table->key_info->key_length);
  GRN_INT32_INIT(&(info->score), 0);
  info->active_index = key_nr;
  info->key_info = &(table->key_info[key_nr]);
  info->primary_key_info = &(table->key_info[table_share->primary_key]);
  info->cursor = NULL;
  info->id_accessor = NULL;
  info->key_accessor = NULL;

  if (key->length() == 0) {
    DBUG_RETURN(info);
  }

  grn_obj *index_column = grn_index_columns[key_nr];
  grn_obj *match_columns, *match_columns_variable;
  GRN_EXPR_CREATE_FOR_QUERY(info->ctx, info->table, match_columns,
                            match_columns_variable);

  grn_obj *expression, *expression_variable;
  GRN_EXPR_CREATE_FOR_QUERY(info->ctx, info->table,
                            expression, expression_variable);

  grn_rc rc = GRN_SUCCESS;
  if (flags & FT_BOOL) {
    rc = generic_ft_init_ext_prepare_expression_in_boolean_mode(info,
                                                                key,
                                                                index_column,
                                                                match_columns,
                                                                expression);
  } else {
    rc = generic_ft_init_ext_prepare_expression_in_normal_mode(info,
                                                               key,
                                                               index_column,
                                                               match_columns,
                                                               expression);
  }

  if (rc == GRN_SUCCESS) {
    if (fast_order_limit) {
      generic_ft_init_ext_add_conditions_fast_order_limit(info, expression);
    }
    longlong escalation_threshold = THDVAR(ha_thd(), match_escalation_threshold);
    mrn::MatchEscalationThresholdScope scope(info->ctx, escalation_threshold);
    grn_table_select(info->ctx, info->table, expression,
                     info->result, GRN_OP_OR);
  }

  grn_obj_unlink(info->ctx, expression);
  grn_obj_unlink(info->ctx, match_columns);

  DBUG_RETURN(info);
}

FT_INFO *ha_mroonga::generic_ft_init_ext(uint flags, uint key_nr, String *key)
{
  MRN_DBUG_ENTER_METHOD();

  check_count_skip(0);

  mrn_change_encoding(ctx, system_charset_info);
  grn_operator operation = GRN_OP_OR;
  if (!matched_record_keys) {
    matched_record_keys = grn_table_create(ctx, NULL, 0, NULL,
                                           GRN_OBJ_TABLE_HASH_KEY | GRN_OBJ_WITH_SUBREC,
                                           grn_table, 0);
    if (!matched_record_keys) {
      char error_message[MRN_MESSAGE_BUFFER_SIZE];
      snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
               "[mroonga][ft-init] "
               "failed to create a table to store all matched records: <%s>",
               ctx->errbuf);
      my_message(ER_ERROR_ON_READ, error_message, MYF(0));
      GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
      DBUG_RETURN(NULL);
    }
  }

  grn_table_sort_key *sort_keys = NULL;
  int n_sort_keys = 0;
  longlong limit = -1;
  check_fast_order_limit(&sort_keys, &n_sort_keys, &limit);

  struct st_mrn_ft_info *info = generic_ft_init_ext_select(flags, key_nr, key);
  if (!info) {
    DBUG_RETURN(NULL);
  }

  grn_rc rc;
  rc = grn_table_setoperation(ctx, matched_record_keys, info->result,
                              matched_record_keys, operation);
  if (rc) {
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "failed to merge matched record keys: <%s>",
             ctx->errbuf);
    my_message(ER_ERROR_ON_READ, error_message, MYF(0));
    GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
  }
  if (fast_order_limit) {
    if (sorted_result) {
      grn_obj_close(ctx, sorted_result);
    }
    sorted_result = grn_table_create(ctx, NULL,
                                     0, NULL,
                                     GRN_OBJ_TABLE_NO_KEY, NULL,
                                     matched_record_keys);
    grn_table_sort(ctx, matched_record_keys, 0, static_cast<int>(limit),
                   sorted_result, sort_keys, n_sort_keys);
  } else if (flags & FT_SORTED) {
    grn_table_sort_key score_sort_key;
    score_sort_key.key = grn_obj_column(ctx,
                                        matched_record_keys,
                                        MRN_COLUMN_NAME_SCORE,
                                        strlen(MRN_COLUMN_NAME_SCORE));
    score_sort_key.offset = 0;
    score_sort_key.flags = GRN_TABLE_SORT_DESC;
    if (sorted_result) {
      grn_obj_unlink(ctx, sorted_result);
    }
    sorted_result = grn_table_create(ctx, NULL,
                                     0, NULL,
                                     GRN_OBJ_TABLE_NO_KEY, NULL,
                                     matched_record_keys);
    grn_table_sort(ctx, matched_record_keys, 0, -1,
                   sorted_result, &score_sort_key, 1);
    grn_obj_unlink(ctx, score_sort_key.key);
  }
  if (sort_keys) {
    for (int i = 0; i < n_sort_keys; i++) {
      grn_obj_unlink(info->ctx, sort_keys[i].key);
    }
    my_free(sort_keys);
  }

  DBUG_RETURN((FT_INFO *)info);
}

FT_INFO *ha_mroonga::wrapper_ft_init_ext(uint flags, uint key_nr, String *key)
{
  MRN_DBUG_ENTER_METHOD();

  FT_INFO *info = generic_ft_init_ext(flags, key_nr, key);
  if (!info) {
    DBUG_RETURN(NULL);
  }

  struct st_mrn_ft_info *mrn_ft_info = (struct st_mrn_ft_info *)info;
  mrn_ft_info->please = &mrn_wrapper_ft_vft;
#ifdef HA_CAN_FULLTEXT_EXT
  mrn_ft_info->could_you = &mrn_wrapper_ft_vft_ext;
#endif
  ++wrap_ft_init_count;

  DBUG_RETURN(info);
}

FT_INFO *ha_mroonga::storage_ft_init_ext(uint flags, uint key_nr, String *key)
{
  MRN_DBUG_ENTER_METHOD();

  FT_INFO *info = generic_ft_init_ext(flags, key_nr, key);
  if (!info) {
    DBUG_RETURN(NULL);
  }

  struct st_mrn_ft_info *mrn_ft_info = (struct st_mrn_ft_info *)info;
  mrn_ft_info->please = &mrn_storage_ft_vft;
#ifdef HA_CAN_FULLTEXT_EXT
  mrn_ft_info->could_you = &mrn_storage_ft_vft_ext;
#endif
  DBUG_RETURN(info);
}

FT_INFO *ha_mroonga::ft_init_ext(uint flags, uint key_nr, String *key)
{
  MRN_DBUG_ENTER_METHOD();
  fulltext_searching = true;
  FT_INFO *info;
  if (key_nr == NO_SUCH_KEY) {
    struct st_mrn_ft_info *mrn_ft_info = new st_mrn_ft_info();
    mrn_ft_info->please = &mrn_no_such_key_ft_vft;
#ifdef HA_CAN_FULLTEXT_EXT
    mrn_ft_info->could_you = &mrn_no_such_key_ft_vft_ext;
#endif
    info = (FT_INFO *)mrn_ft_info;
  } else {
    if (share->wrapper_mode)
    {
      info = wrapper_ft_init_ext(flags, key_nr, key);
    } else {
      info = storage_ft_init_ext(flags, key_nr, key);
    }
  }
  DBUG_RETURN(info);
}

int ha_mroonga::wrapper_ft_read(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  if (wrap_ft_init_count)
    set_pk_bitmap();

  struct st_mrn_ft_info *mrn_ft_info =
    reinterpret_cast<struct st_mrn_ft_info *>(ft_handler);
  GRN_CTX_SET_ENCODING(ctx, mrn_ft_info->encoding);

  int error = 0;
  do {
    grn_id found_record_id;
    found_record_id = grn_table_cursor_next(ctx, mrn_ft_info->cursor);
    if (found_record_id == GRN_ID_NIL) {
      error = HA_ERR_END_OF_FILE;
      break;
    }

    GRN_BULK_REWIND(&key_buffer);
    if (mrn_ft_info->key_accessor) {
      grn_obj_get_value(ctx, mrn_ft_info->key_accessor,
                        found_record_id, &key_buffer);
    } else {
      void *key;
      int key_length;
      key_length = grn_table_cursor_get_key(ctx, mrn_ft_info->cursor, &key);
      GRN_TEXT_SET(ctx, &key_buffer, key, key_length);
    }
    error = wrapper_get_record(buf, (const uchar *)GRN_TEXT_VALUE(&key_buffer));
  } while (error == HA_ERR_END_OF_FILE || error == HA_ERR_KEY_NOT_FOUND);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_ft_read(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  struct st_mrn_ft_info *mrn_ft_info =
    reinterpret_cast<struct st_mrn_ft_info *>(ft_handler);
  GRN_CTX_SET_ENCODING(ctx, mrn_ft_info->encoding);

  grn_id found_record_id;
  found_record_id = grn_table_cursor_next(ctx, mrn_ft_info->cursor);
  if (ctx->rc) {
    my_message(ER_ERROR_ON_READ, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_READ);
  }

  if (found_record_id == GRN_ID_NIL) {
    table->status = STATUS_NOT_FOUND;
    DBUG_RETURN(HA_ERR_END_OF_FILE);
  }
  table->status = 0;

  if (count_skip && record_id != GRN_ID_NIL) {
    DBUG_RETURN(0);
  }

  GRN_BULK_REWIND(&key_buffer);
  if (mrn_ft_info->id_accessor) {
    grn_obj id_buffer;
    GRN_RECORD_INIT(&id_buffer, 0, grn_obj_id(ctx, grn_table));
    grn_obj_get_value(ctx, mrn_ft_info->id_accessor,
                      found_record_id, &id_buffer);
    record_id = GRN_RECORD_VALUE(&id_buffer);
  } else if (mrn_ft_info->key_accessor) {
    grn_obj_get_value(ctx, mrn_ft_info->key_accessor,
                      found_record_id, &key_buffer);
    record_id = grn_table_get(ctx, grn_table,
                              GRN_TEXT_VALUE(&key_buffer),
                              GRN_TEXT_LEN(&key_buffer));
  } else {
    void *key;
    grn_table_cursor_get_key(ctx, mrn_ft_info->cursor, &key);
    if (ctx->rc) {
      record_id = GRN_ID_NIL;
      my_message(ER_ERROR_ON_READ, ctx->errbuf, MYF(0));
      DBUG_RETURN(ER_ERROR_ON_READ);
    } else {
      record_id = *((grn_id *)key);
    }
  }
  storage_store_fields(buf, record_id);
  DBUG_RETURN(0);
}

int ha_mroonga::ft_read(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_ft_read(buf);
  } else {
    error = storage_ft_read(buf);
  }
  DBUG_RETURN(error);
}

const Item *ha_mroonga::wrapper_cond_push(const Item *cond)
{
  const Item *reminder_cond;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  reminder_cond = wrap_handler->cond_push(cond);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(reminder_cond);
}

const Item *ha_mroonga::storage_cond_push(const Item *cond)
{
  MRN_DBUG_ENTER_METHOD();
  const Item *reminder_cond = cond;
  if (!pushed_cond) {
    mrn::ConditionConverter converter(ctx, grn_table, true);
    if (converter.count_match_against(cond) == 1 &&
        converter.is_convertable(cond)) {
      reminder_cond = NULL;
    }
  }
  DBUG_RETURN(reminder_cond);
}

const Item *ha_mroonga::cond_push(const Item *cond)
{
  MRN_DBUG_ENTER_METHOD();
  const Item *reminder_cond;
  if (share->wrapper_mode)
  {
    reminder_cond = wrapper_cond_push(cond);
  } else {
    reminder_cond = storage_cond_push(cond);
  }
  DBUG_RETURN(reminder_cond);
}

void ha_mroonga::wrapper_cond_pop()
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->cond_pop();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_cond_pop()
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_VOID_RETURN;
}

void ha_mroonga::cond_pop()
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
    wrapper_cond_pop();
  else
    storage_cond_pop();
  DBUG_VOID_RETURN;
}

bool ha_mroonga::wrapper_get_error_message(int error, String *buf)
{
  bool temporary_error;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  temporary_error = wrap_handler->get_error_message(error, buf);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(temporary_error);
}

bool ha_mroonga::storage_get_error_message(int error, String *buf)
{
  MRN_DBUG_ENTER_METHOD();
  bool temporary_error = false;
  // latest error message
  buf->copy(ctx->errbuf, (uint) strlen(ctx->errbuf), system_charset_info);
  DBUG_RETURN(temporary_error);
}

bool ha_mroonga::get_error_message(int error, String *buf)
{
  MRN_DBUG_ENTER_METHOD();
  bool temporary_error;
  if (share && share->wrapper_mode)
  {
    temporary_error = wrapper_get_error_message(error, buf);
  } else {
    temporary_error = storage_get_error_message(error, buf);
  }
  DBUG_RETURN(temporary_error);
}

ulonglong ha_mroonga::file_size(const char *path)
{
  MRN_DBUG_ENTER_METHOD();

  struct stat file_status;
  if (stat(path, &file_status) == 0) {
    DBUG_RETURN(file_status.st_size);
  } else {
    DBUG_RETURN(0);
  }
}

bool ha_mroonga::have_unique_index()
{
  MRN_DBUG_ENTER_METHOD();

  uint n_keys = table->s->keys;

  for (uint i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &(table->key_info[i]);
    if (key_info->flags & HA_NOSAME) {
      DBUG_RETURN(true);
    }
  }

  DBUG_RETURN(false);
}

bool ha_mroonga::is_foreign_key_field(const char *table_name,
                                      const char *field_name)
{
  MRN_DBUG_ENTER_METHOD();

  grn_obj *table = grn_ctx_get(ctx, table_name, -1);
  if (!table) {
    DBUG_RETURN(false);
  }

  mrn::ColumnName column_name(field_name);
  grn_obj *column = grn_obj_column(ctx,
                                   table,
                                   column_name.c_str(),
                                   column_name.length());
  if (!column) {
    DBUG_RETURN(false);
  }

  grn_obj *range = grn_ctx_at(ctx, grn_obj_get_range(ctx, column));
  if (!range) {
    grn_obj_unlink(ctx, column);
    DBUG_RETURN(false);
  }

  if (!mrn::grn::is_table(range)) {
    grn_obj_unlink(ctx, column);
    DBUG_RETURN(false);
  }

  grn_obj *foreign_index_column;
  mrn::IndexColumnName index_column_name(table_name, field_name);
  foreign_index_column = grn_obj_column(ctx, range,
                                        index_column_name.c_str(),
                                        index_column_name.length());
  if (foreign_index_column) {
    grn_obj_unlink(ctx, foreign_index_column);
    DBUG_RETURN(true);
  }

  grn_obj_unlink(ctx, column);
  DBUG_RETURN(false);
}

void ha_mroonga::push_warning_unsupported_spatial_index_search(enum ha_rkey_function flag)
{
  char search_name[MRN_BUFFER_SIZE];
  if (flag == HA_READ_MBR_INTERSECT) {
    strcpy(search_name, "intersect");
  } else if (flag == HA_READ_MBR_WITHIN) {
    strcpy(search_name, "within");
  } else if (flag & HA_READ_MBR_DISJOINT) {
    strcpy(search_name, "disjoint");
  } else if (flag & HA_READ_MBR_EQUAL) {
    strcpy(search_name, "equal");
  } else {
    snprintf(search_name, MRN_BUFFER_SIZE, "unknown: %d", flag);
  }
  push_warning_printf(ha_thd(),
                      MRN_SEVERITY_WARNING,
                      ER_UNSUPPORTED_EXTENSION,
                      "spatial index search "
                      "except MBRContains aren't supported: <%s>",
                      search_name);
}

void ha_mroonga::clear_cursor()
{
  MRN_DBUG_ENTER_METHOD();
  if (cursor) {
    grn_obj_unlink(ctx, cursor);
    cursor = NULL;
  }
  if (index_table_cursor) {
    grn_table_cursor_close(ctx, index_table_cursor);
    index_table_cursor = NULL;
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::clear_cursor_geo()
{
  MRN_DBUG_ENTER_METHOD();
  if (cursor_geo) {
    grn_obj_unlink(ctx, cursor_geo);
    cursor_geo = NULL;
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::clear_empty_value_records()
{
  MRN_DBUG_ENTER_METHOD();
  if (empty_value_records_cursor) {
    grn_table_cursor_close(ctx, empty_value_records_cursor);
    empty_value_records_cursor = NULL;
  }
  if (empty_value_records) {
    grn_obj_unlink(ctx, empty_value_records);
    empty_value_records = NULL;
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::clear_search_result()
{
  MRN_DBUG_ENTER_METHOD();
  clear_cursor();
  if (sorted_result) {
    grn_obj_unlink(ctx, sorted_result);
    sorted_result = NULL;
  }
  if (matched_record_keys) {
    grn_obj_unlink(ctx, matched_record_keys);
    matched_record_keys = NULL;
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::clear_search_result_geo()
{
  MRN_DBUG_ENTER_METHOD();
  clear_cursor_geo();
  if (grn_source_column_geo) {
    grn_obj_unlink(ctx, grn_source_column_geo);
    grn_source_column_geo = NULL;
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::clear_indexes()
{
  MRN_DBUG_ENTER_METHOD();
  uint n_keys = table->s->keys;
  uint pkey_nr = table->s->primary_key;

  for (uint i = 0; i < n_keys; i++) {
    if (i != pkey_nr) {
      if (grn_index_tables) {
        grn_obj_unlink(ctx, grn_index_tables[i]);
      }
      if (grn_index_columns) {
        grn_obj_unlink(ctx, grn_index_columns[i]);
      }
    }
  }

  if (grn_index_tables) {
    free(grn_index_tables);
    grn_index_tables = NULL;
  }

  if (grn_index_columns) {
    free(grn_index_columns);
    grn_index_columns = NULL;
  }

  if (key_id) {
    free(key_id);
    key_id = NULL;
  }

  if (del_key_id) {
    free(del_key_id);
    del_key_id = NULL;
  }

  DBUG_VOID_RETURN;
}

int ha_mroonga::add_wrap_hton(const char *path, handlerton *wrap_handlerton)
{
  MRN_DBUG_ENTER_METHOD();
  st_mrn_slot_data *slot_data = mrn_get_slot_data(ha_thd(), true);
  if (!slot_data)
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
  st_mrn_wrap_hton *wrap_hton =
    (st_mrn_wrap_hton *)malloc(sizeof(st_mrn_wrap_hton));
  if (!wrap_hton)
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
  wrap_hton->next = NULL;
  strcpy(wrap_hton->path, path);
  wrap_hton->hton = wrap_handlerton;
  if (slot_data->first_wrap_hton)
  {
    st_mrn_wrap_hton *tmp_wrap_hton = slot_data->first_wrap_hton;
    while (tmp_wrap_hton->next)
      tmp_wrap_hton = tmp_wrap_hton->next;
    tmp_wrap_hton->next = wrap_hton;
  } else {
    slot_data->first_wrap_hton = wrap_hton;
  }
  DBUG_RETURN(0);
}

void ha_mroonga::remove_related_files(const char *base_path)
{
  MRN_DBUG_ENTER_METHOD();

  const char *base_directory_name = ".";
  size_t base_path_length = strlen(base_path);
#ifdef WIN32
  WIN32_FIND_DATA data;
  HANDLE finder = FindFirstFile(base_directory_name, &data);
  if (finder != INVALID_HANDLE_VALUE) {
    do {
      if (!(data.dwFileAttributes & FILE_ATTRIBUTE_NORMAL)) {
        continue;
      }
      if (strncmp(data.cFileName, base_path, base_path_length) == 0) {
        unlink(data.cFileName);
      }
    } while (FindNextFile(finder, &data) != 0);
    FindClose(finder);
  }
#else
  DIR *dir = opendir(base_directory_name);
  if (dir) {
    while (struct dirent *entry = readdir(dir)) {
      struct stat file_status;
      if (stat(entry->d_name, &file_status) != 0) {
        continue;
      }
      if (!((file_status.st_mode & S_IFMT) == S_IFREG)) {
        continue;
      }
      if (strncmp(entry->d_name, base_path, base_path_length) == 0) {
        unlink(entry->d_name);
      }
    }
    closedir(dir);
  }
#endif

  DBUG_VOID_RETURN;
}

void ha_mroonga::remove_grn_obj_force(const char *name)
{
  MRN_DBUG_ENTER_METHOD();

  grn_obj *obj = grn_ctx_get(ctx, name, strlen(name));
  if (obj) {
    grn_obj_remove(ctx, obj);
  } else {
    grn_obj *db = grn_ctx_db(ctx);
    grn_id id = grn_table_get(ctx, db, name, strlen(name));
    if (id) {
      char path[MRN_MAX_PATH_SIZE];
      grn_obj_delete_by_id(ctx, db, id, GRN_TRUE);
      if (grn_obj_path_by_id(ctx, db, id, path) == GRN_SUCCESS) {
        remove_related_files(path);
      }
    }
  }

  DBUG_VOID_RETURN;
}

int ha_mroonga::drop_index(MRN_SHARE *target_share, uint key_index)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  grn_rc rc = GRN_SUCCESS;
  char target_name[GRN_TABLE_MAX_KEY_SIZE];
  int target_name_length;

  KEY *key_info = target_share->table_share->key_info;
  if (!target_share->wrapper_mode && target_share->index_table[key_index]) {
    const char *table_name = target_share->index_table[key_index];
    snprintf(target_name, GRN_TABLE_MAX_KEY_SIZE,
             "%s.%s", table_name, key_info[key_index].name.str);
    target_name_length = strlen(target_name);
    grn_obj *index_column = grn_ctx_get(ctx, target_name, target_name_length);
    if (index_column) {
      rc = grn_obj_remove(ctx, index_column);
    }
  } else {
    mrn::PathMapper mapper(target_share->table_name);
    mrn::IndexTableName index_table_name(mapper.table_name(),
                                         key_info[key_index].name.str);
    grn_obj *index_table = grn_ctx_get(ctx,
                                       index_table_name.c_str(),
                                       index_table_name.length());
    if (!index_table) {
      index_table = grn_ctx_get(ctx,
                                index_table_name.old_c_str(),
                                index_table_name.old_length());
    }
    if (index_table) {
      target_name_length = grn_obj_name(ctx, index_table,
                                        target_name, GRN_TABLE_MAX_KEY_SIZE);
      rc = grn_obj_remove(ctx, index_table);
    } else {
      target_name_length = 0;
    }
  }

  if (rc != GRN_SUCCESS) {
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "failed to drop index: <%.*s>: <%s>",
             target_name_length, target_name,
             ctx->errbuf);
    my_message(ER_ERROR_ON_WRITE, error_message, MYF(0));
    GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
  }

  DBUG_RETURN(error);
}

int ha_mroonga::drop_indexes_normal(const char *table_name, grn_obj *table)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  grn_hash *columns_raw = grn_hash_create(ctx, NULL, sizeof(grn_id), 0,
                                          GRN_OBJ_TABLE_HASH_KEY);
  mrn::SmartGrnObj columns(ctx, reinterpret_cast<grn_obj *>(columns_raw));
  if (!columns.get()) {
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "failed to allocate columns buffer: <%s>: <%s>",
             table_name, ctx->errbuf);
    error = HA_ERR_OUT_OF_MEM;
    my_message(ER_ERROR_ON_WRITE, error_message, MYF(0));
    GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
    DBUG_RETURN(error);
  }

  grn_table_columns(ctx, table, "", 0, columns.get());
  grn_table_cursor *cursor = grn_table_cursor_open(ctx,
                                                   columns.get(),
                                                   NULL, 0,
                                                   NULL, 0,
                                                   0, -1,
                                                   0);
  if (!cursor) {
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "failed to allocate columns cursor: <%s>: <%s>",
             table_name, ctx->errbuf);
    error = HA_ERR_OUT_OF_MEM;
    my_message(ER_ERROR_ON_WRITE, error_message, MYF(0));
    GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
    DBUG_RETURN(error);
  }

  while (grn_table_cursor_next(ctx, cursor) != GRN_ID_NIL) {
    void *key;
    grn_table_cursor_get_key(ctx, cursor, &key);
    grn_id *id = reinterpret_cast<grn_id *>(key);
    mrn::SmartGrnObj column(ctx, grn_ctx_at(ctx, *id));
    if (!column.get()) {
      continue;
    }

    grn_operator index_operators[] = {
      GRN_OP_EQUAL,
      GRN_OP_MATCH,
      GRN_OP_LESS,
      GRN_OP_REGEXP
    };
    size_t n_index_operators = sizeof(index_operators) / sizeof(grn_operator);
    for (size_t i = 0; i < n_index_operators; i++) {
      grn_index_datum index_datum;
      while (grn_column_find_index_data(ctx,
                                        column.get(),
                                        index_operators[i],
                                        &index_datum,
                                        1) > 0) {
        grn_id index_table_id = index_datum.index->header.domain;
        mrn::SmartGrnObj index_table(ctx, grn_ctx_at(ctx, index_table_id));
        char index_table_name[GRN_TABLE_MAX_KEY_SIZE];
        int index_table_name_length;
        index_table_name_length = grn_obj_name(ctx, index_table.get(),
                                               index_table_name,
                                               GRN_TABLE_MAX_KEY_SIZE);
        if (mrn::IndexTableName::is_custom_name(table_name,
                                                strlen(table_name),
                                                index_table_name,
                                                index_table_name_length)) {
          char index_column_name[GRN_TABLE_MAX_KEY_SIZE];
          int index_column_name_length;
          index_column_name_length = grn_obj_name(ctx,
                                                  index_datum.index,
                                                  index_column_name,
                                                  GRN_TABLE_MAX_KEY_SIZE);
          grn_rc rc = grn_obj_remove(ctx, index_datum.index);
          if (rc != GRN_SUCCESS) {
            char error_message[MRN_MESSAGE_BUFFER_SIZE];
            snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
                     "failed to drop index column: <%.*s>: <%s>",
                     index_column_name_length, index_column_name,
                     ctx->errbuf);
            error = ER_ERROR_ON_WRITE;
            my_message(error, error_message, MYF(0));
            GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
          }
        } else {
          grn_rc rc = grn_obj_remove(ctx, index_table.get());
          if (rc == GRN_SUCCESS) {
            index_table.release();
          } else {
            char error_message[MRN_MESSAGE_BUFFER_SIZE];
            snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
                     "failed to drop index table: <%.*s>: <%s>",
                     index_table_name_length, index_table_name,
                     ctx->errbuf);
            error = ER_ERROR_ON_WRITE;
            my_message(error, error_message, MYF(0));
            GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
          }
        }

        if (error != 0) {
          break;
        }
      }

      if (error != 0) {
        break;
      }
    }

    if (error != 0) {
      break;
    }
  }

  grn_table_cursor_close(ctx, cursor);

  DBUG_RETURN(error);
}

int ha_mroonga::drop_indexes_multiple(const char *table_name,
                                      grn_obj *table,
                                      const char *index_table_name_separator)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  char index_table_name_prefix[GRN_TABLE_MAX_KEY_SIZE];
  snprintf(index_table_name_prefix, GRN_TABLE_MAX_KEY_SIZE,
           "%s%s", table_name, index_table_name_separator);
  grn_table_cursor *cursor =
    grn_table_cursor_open(ctx,
                          grn_ctx_db(ctx),
                          index_table_name_prefix,
                          strlen(index_table_name_prefix),
                          NULL, 0,
                          0, -1,
                          GRN_CURSOR_PREFIX);
  if (!cursor) {
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "failed to allocate index tables cursor: <%s>: <%s>",
             table_name, ctx->errbuf);
    error = HA_ERR_OUT_OF_MEM;
    my_message(ER_ERROR_ON_WRITE, error_message, MYF(0));
    GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
    DBUG_RETURN(error);
  }

  grn_id table_id = grn_obj_id(ctx, table);
  grn_id id;
  while ((id = grn_table_cursor_next(ctx, cursor)) != GRN_ID_NIL) {
    mrn::SmartGrnObj object(ctx, grn_ctx_at(ctx, id));
    if (!object.get()) {
      continue;
    }
    if (!grn_obj_is_table(ctx, object.get())) {
      continue;
    }

    char multiple_column_index_table_name[GRN_TABLE_MAX_KEY_SIZE];
    int multiple_column_index_table_name_length;
    multiple_column_index_table_name_length =
      grn_obj_name(ctx,
                   object.get(),
                   multiple_column_index_table_name,
                   GRN_TABLE_MAX_KEY_SIZE);

    char multiple_column_index_name[GRN_TABLE_MAX_KEY_SIZE];
    snprintf(multiple_column_index_name, GRN_TABLE_MAX_KEY_SIZE,
             "%.*s.%s",
             multiple_column_index_table_name_length,
             multiple_column_index_table_name,
             INDEX_COLUMN_NAME);
    mrn::SmartGrnObj index_column(ctx, multiple_column_index_name);
    if (!index_column.get()) {
      continue;
    }

    if (grn_obj_get_range(ctx, index_column.get()) != table_id) {
      continue;
    }

    grn_rc rc = grn_obj_remove(ctx, object.get());
    if (rc == GRN_SUCCESS) {
      object.release();
      index_column.release();
    } else {
      char error_message[MRN_MESSAGE_BUFFER_SIZE];
      snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
               "failed to drop multiple column index table: <%.*s>: <%s>",
               multiple_column_index_table_name_length,
               multiple_column_index_table_name,
               ctx->errbuf);
      error = ER_ERROR_ON_WRITE;
      my_message(error, error_message, MYF(0));
      GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
      break;
    }
  }

  grn_table_cursor_close(ctx, cursor);

  DBUG_RETURN(error);
}

int ha_mroonga::drop_indexes(const char *table_name)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  mrn::SmartGrnObj table(ctx, table_name);
  if (!table.get()) {
    DBUG_RETURN(0);
  }

  error = drop_indexes_normal(table_name, table.get());
  if (error == 0) {
    error = drop_indexes_multiple(table_name, table.get(),
                                  mrn::IndexTableName::SEPARATOR);
  }
  if (error == 0) {
    error = drop_indexes_multiple(table_name, table.get(),
                                  mrn::IndexTableName::OLD_SEPARATOR);
  }

  DBUG_RETURN(error);
}

bool ha_mroonga::find_column_flags(Field *field, MRN_SHARE *mrn_share, int i,
                                   grn_obj_flags *column_flags)
{
  MRN_DBUG_ENTER_METHOD();
  bool found = false;

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  {
    const char *names = field->option_struct->flags;
    if (names) {
      found = mrn_parse_grn_column_create_flags(ha_thd(),
                                                ctx,
                                                names,
                                                strlen(names),
                                                column_flags);
      DBUG_RETURN(found);
    }
  }
#endif

  if (mrn_share->col_flags[i]) {
    found = mrn_parse_grn_column_create_flags(ha_thd(),
                                              ctx,
                                              mrn_share->col_flags[i],
                                              mrn_share->col_flags_length[i],
                                              column_flags);
    DBUG_RETURN(found);
  }

  DBUG_RETURN(found);
}

grn_obj *ha_mroonga::find_column_type(Field *field, MRN_SHARE *mrn_share, int i,
                                      int error_code)
{
  MRN_DBUG_ENTER_METHOD();

  const char *grn_type_name = NULL;
#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  grn_type_name = field->option_struct->groonga_type;
#endif
  if (!grn_type_name) {
    grn_type_name = mrn_share->col_type[i];
  }

  grn_obj *type = NULL;
  if (grn_type_name) {
    type = grn_ctx_get(ctx, grn_type_name, -1);
    if (!type) {
      char error_message[MRN_BUFFER_SIZE];
      snprintf(error_message, MRN_BUFFER_SIZE,
               "unknown custom Groonga type name for <%s> column: <%s>",
               field->field_name.str, grn_type_name);
      GRN_LOG(ctx, GRN_LOG_ERROR, "%s", error_message);
      my_message(error_code, error_message, MYF(0));

      DBUG_RETURN(NULL);
    }
  } else {
    grn_builtin_type grn_type_id = mrn_grn_type_from_field(ctx, field, false);
    type = grn_ctx_at(ctx, grn_type_id);
  }

  DBUG_RETURN(type);
}

grn_obj *ha_mroonga::find_tokenizer(KEY *key, MRN_SHARE *mrn_share, int i)
{
  MRN_DBUG_ENTER_METHOD();
  grn_obj *tokenizer;
  const char *tokenizer_name = NULL;
  uint tokenizer_name_length = 0;
#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  if (key->option_struct->tokenizer) {
    tokenizer_name = key->option_struct->tokenizer;
    tokenizer_name_length = strlen(tokenizer_name);
  }
#endif
  if (!tokenizer_name) {
    tokenizer_name = mrn_share->key_tokenizer[i];
    tokenizer_name_length = mrn_share->key_tokenizer_length[i];
  }
  tokenizer = find_tokenizer(tokenizer_name, tokenizer_name_length);
  DBUG_RETURN(tokenizer);
}

grn_obj *ha_mroonga::find_tokenizer(const char *name, int name_length)
{
  MRN_DBUG_ENTER_METHOD();

  if (strncasecmp("off", name, name_length) == 0) {
    DBUG_RETURN(NULL);
  }

  grn_obj *tokenizer;
  mrn_change_encoding(ctx, system_charset_info);
  tokenizer = grn_ctx_get(ctx, name, name_length);
  if (!tokenizer) {
    char message[MRN_BUFFER_SIZE];
    snprintf(message, MRN_BUFFER_SIZE,
             "specified tokenizer for fulltext index <%.*s> doesn't exist. "
             "The default tokenizer for fulltext index <%s> is used instead.",
             name_length, name,
             MRN_DEFAULT_TOKENIZER);
    push_warning(ha_thd(),
                 MRN_SEVERITY_WARNING, ER_UNSUPPORTED_EXTENSION,
                 message);
    tokenizer = grn_ctx_get(ctx,
                            MRN_DEFAULT_TOKENIZER,
                            strlen(MRN_DEFAULT_TOKENIZER));
  }
  if (!tokenizer) {
    push_warning(ha_thd(),
                 MRN_SEVERITY_WARNING, ER_UNSUPPORTED_EXTENSION,
                 "couldn't find tokenizer for fulltext index. "
                 "Bigram tokenizer is used instead.");
    tokenizer = grn_ctx_at(ctx, GRN_DB_BIGRAM);
  }
  DBUG_RETURN(tokenizer);
}

bool ha_mroonga::have_custom_normalizer(KEY *key) const
{
  MRN_DBUG_ENTER_METHOD();

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  if (key->option_struct && key->option_struct->normalizer) {
    DBUG_RETURN(true);
  }
#endif

  if (key->comment.length > 0) {
    mrn::ParametersParser parser(key->comment.str,
                                 key->comment.length);
    parser.parse();
    DBUG_RETURN(parser["normalizer"] != NULL);
  }

  DBUG_RETURN(false);
}

grn_obj *ha_mroonga::find_normalizer(KEY *key)
{
  MRN_DBUG_ENTER_METHOD();

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  if (key->option_struct->normalizer) {
    grn_obj *normalizer = find_normalizer(key,
                                          key->option_struct->normalizer);
    DBUG_RETURN(normalizer);
  }
#endif

  if (key->comment.length > 0) {
    mrn::ParametersParser parser(key->comment.str,
                                 key->comment.length);
    parser.parse();
    grn_obj *normalizer = find_normalizer(key, parser["normalizer"]);
    DBUG_RETURN(normalizer);
  }

  grn_obj *normalizer = find_normalizer(key, NULL);
  DBUG_RETURN(normalizer);
}

grn_obj *ha_mroonga::find_normalizer(KEY *key, const char *name)
{
  MRN_DBUG_ENTER_METHOD();

  grn_obj *normalizer = NULL;
  bool use_normalizer = true;
  if (name) {
    if (strcmp(name, "none") == 0) {
      use_normalizer = false;
    } else {
      normalizer = grn_ctx_get(ctx, name, -1);
    }
  }
  if (use_normalizer && !normalizer) {
    Field *field = key->key_part[0].field;
    mrn::FieldNormalizer field_normalizer(ctx, ha_thd(), field);
    normalizer = field_normalizer.find_grn_normalizer();
  }

  DBUG_RETURN(normalizer);
}

bool ha_mroonga::find_index_column_flags(KEY *key, grn_column_flags *index_column_flags)
{
  MRN_DBUG_ENTER_METHOD();
  bool found = false;

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  {
    const char *names = key->option_struct->flags;
    if (names) {
      found = mrn_parse_grn_index_column_flags(ha_thd(),
                                               ctx,
                                               names,
                                               strlen(names),
                                               index_column_flags);
      DBUG_RETURN(found);
    }
  }
#endif

  if (key->comment.length > 0) {
    mrn::ParametersParser parser(key->comment.str,
                                 key->comment.length);
    parser.parse();
    const char *names = parser["flags"];
    if (!names) {
      // Deprecated. It's for backward compatibility.
      names = parser["index_flags"];
    }
    if (names) {
      found = mrn_parse_grn_index_column_flags(ha_thd(),
                                               ctx,
                                               names,
                                               strlen(names),
                                               index_column_flags);
    }
  }

  DBUG_RETURN(found);
}

bool ha_mroonga::find_token_filters(KEY *key, grn_obj *token_filters)
{
  MRN_DBUG_ENTER_METHOD();
  bool found = false;

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  if (key->option_struct->token_filters) {
    found = find_token_filters_fill(token_filters,
                                    key->option_struct->token_filters,
                                    strlen(key->option_struct->token_filters));
    DBUG_RETURN(found);
  }
#endif

  if (key->comment.length > 0) {
    mrn::ParametersParser parser(key->comment.str,
                                 key->comment.length);
    parser.parse();
    const char *names = parser["token_filters"];
    if (names) {
      found = find_token_filters_fill(token_filters, names, strlen(names));
    }
  }

  DBUG_RETURN(found);
}

bool ha_mroonga::find_token_filters_put(grn_obj *token_filters,
                                        const char *token_filter_name,
                                        int token_filter_name_length)
{
  grn_obj *token_filter;

  token_filter = grn_ctx_get(ctx,
                             token_filter_name,
                             token_filter_name_length);
  if (token_filter) {
    GRN_PTR_PUT(ctx, token_filters, token_filter);
    return true;
  } else {
    char message[MRN_BUFFER_SIZE];
    snprintf(message, MRN_BUFFER_SIZE,
             "nonexistent token filter: <%.*s>",
             token_filter_name_length, token_filter_name);
    push_warning(ha_thd(),
                 MRN_SEVERITY_WARNING, ER_UNSUPPORTED_EXTENSION,
                 message);
    return false;
  }
}

bool ha_mroonga::find_token_filters_fill(grn_obj *token_filters,
                                         const char *token_filter_names,
                                         int token_filter_names_length)
{
  const char *start, *current, *end;
  const char *name_start, *name_end;
  const char *last_name_end;

  start = token_filter_names;
  end = start + token_filter_names_length;
  current = start;
  name_start = NULL;
  name_end = NULL;
  last_name_end = start;
  while (current < end) {
    switch (current[0]) {
    case ' ' :
      if (name_start && !name_end) {
        name_end = current;
      }
      break;
    case ',' :
      if (!name_start) {
        goto break_loop;
      }
      if (!name_end) {
        name_end = current;
      }
      find_token_filters_put(token_filters,
                             name_start,
                             name_end - name_start);
      last_name_end = name_end + 1;
      name_start = NULL;
      name_end = NULL;
      break;
    default :
      if (!name_start) {
        name_start = current;
      }
      break;
    }
    current++;
  }

break_loop:
  if (!name_start) {
    char message[MRN_BUFFER_SIZE];
    snprintf(message, MRN_BUFFER_SIZE,
             "empty token filter name: "
             "<%.*s|%.*s|%.*s>",
             (int)(last_name_end - start), start,
             (int)(current - last_name_end), last_name_end,
             (int)(end - current), current);
    push_warning(ha_thd(),
                 MRN_SEVERITY_WARNING, ER_UNSUPPORTED_EXTENSION,
                 message);
    return false;
  }

  if (!name_end) {
    name_end = current;
  }
  find_token_filters_put(token_filters,
                         name_start,
                         name_end - name_start);

  return true;
}

int ha_mroonga::wrapper_get_record(uchar *buf, const uchar *key)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (wrap_handler->inited == NONE) {
#ifdef MRN_HANDLER_HAVE_HA_INDEX_READ_IDX_MAP
    error = wrap_handler->ha_index_read_idx_map(buf,
                                                share->wrap_primary_key,
                                                key,
                                                pk_keypart_map,
                                                HA_READ_KEY_EXACT);
#else
    error = wrap_handler->index_read_idx_map(buf,
                                             share->wrap_primary_key,
                                             key,
                                             pk_keypart_map,
                                             HA_READ_KEY_EXACT);
#endif
  } else {
#ifdef MRN_HANDLER_HAVE_HA_INDEX_READ_MAP
    error = wrap_handler->ha_index_read_map(buf,
                                            key,
                                            pk_keypart_map,
                                            HA_READ_KEY_EXACT);
#else
    error = wrap_handler->index_read_map(buf,
                                         key,
                                         pk_keypart_map,
                                         HA_READ_KEY_EXACT);
#endif
  }
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_get_next_geo_record(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  mrn_change_encoding(ctx, NULL);
  do {
    GRN_BULK_REWIND(&key_buffer);
    grn_id found_record_id;
    grn_posting *posting;
    posting = grn_geo_cursor_next(ctx, cursor_geo);
    if (!posting) {
      error = HA_ERR_END_OF_FILE;
      clear_cursor_geo();
      break;
    }
    found_record_id = posting->rid;
    grn_table_get_key(ctx, grn_table, found_record_id,
                      GRN_TEXT_VALUE(&key_buffer),
                      table->key_info->key_length);
    error = wrapper_get_record(buf, (const uchar *)GRN_TEXT_VALUE(&key_buffer));
  } while (error == HA_ERR_END_OF_FILE || error == HA_ERR_KEY_NOT_FOUND);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_get_next_record(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  if (cursor_geo) {
    grn_posting *posting;
    posting = grn_geo_cursor_next(ctx, cursor_geo);
    if (posting) {
      record_id = posting->rid;
    } else {
      record_id = GRN_ID_NIL;
    }
  } else if (cursor) {
    record_id = grn_table_cursor_next(ctx, cursor);
  } else if (empty_value_records_cursor) {
    grn_id empty_value_record_id;
    empty_value_record_id =
      grn_table_cursor_next(ctx, empty_value_records_cursor);
    if (empty_value_record_id == GRN_ID_NIL) {
      record_id = GRN_ID_NIL;
    } else {
      grn_table_get_key(ctx, empty_value_records, empty_value_record_id,
                        &record_id, sizeof(grn_id));
    }
  } else {
    record_id = GRN_ID_NIL;
  }
  if (ctx->rc) {
    int error = ER_ERROR_ON_READ;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  if (record_id == GRN_ID_NIL) {
    DBUG_PRINT("info", ("mroonga: storage_get_next_record: end-of-file"));
    table->status = STATUS_NOT_FOUND;
    DBUG_RETURN(HA_ERR_END_OF_FILE);
  }
  if (buf) {
    if (ignoring_no_key_columns)
      storage_store_fields_by_index(buf);
    else
      storage_store_fields(buf, record_id);
    if (cursor_geo && grn_source_column_geo) {
      int latitude, longitude;
      GRN_GEO_POINT_VALUE(&source_point, latitude, longitude);
      double latitude_in_degree = GRN_GEO_MSEC2DEGREE(latitude);
      double longitude_in_degree = GRN_GEO_MSEC2DEGREE(longitude);
      if (!((bottom_right_latitude_in_degree <= latitude_in_degree &&
             latitude_in_degree <= top_left_latitude_in_degree) &&
            (top_left_longitude_in_degree <= longitude_in_degree &&
             longitude_in_degree <= bottom_right_longitude_in_degree))) {
        DBUG_PRINT("info",
                   ("mroonga: remove not contained geo point: "
                    "<%g,%g>(<%d,%d>); key: <%g,%g>(<%d,%d>), <%g,%g>(<%d,%d>)",
                    latitude_in_degree, longitude_in_degree,
                    latitude, longitude,
                    top_left_latitude_in_degree, top_left_longitude_in_degree,
                    GRN_GEO_DEGREE2MSEC(top_left_latitude_in_degree),
                    GRN_GEO_DEGREE2MSEC(top_left_longitude_in_degree),
                    bottom_right_latitude_in_degree,
                    bottom_right_longitude_in_degree,
                    GRN_GEO_DEGREE2MSEC(bottom_right_latitude_in_degree),
                    GRN_GEO_DEGREE2MSEC(bottom_right_longitude_in_degree)));
        int error = storage_get_next_record(buf);
        DBUG_RETURN(error);
      }
    }
  }
  table->status = 0;
  DBUG_RETURN(0);
}

void ha_mroonga::geo_store_rectangle(const uchar *rectangle)
{
  MRN_DBUG_ENTER_METHOD();

  double locations[4];
  for (int i = 0; i < 4; i++) {
    uchar reversed_value[8];
    for (int j = 0; j < 8; j++) {
      reversed_value[j] = (rectangle + (8 * i))[7 - j];
    }
    mi_float8get(locations[i], reversed_value);
  }
  top_left_longitude_in_degree = locations[0];
  bottom_right_longitude_in_degree = locations[1];
  bottom_right_latitude_in_degree = locations[2];
  top_left_latitude_in_degree = locations[3];
  int top_left_latitude = GRN_GEO_DEGREE2MSEC(top_left_latitude_in_degree);
  int top_left_longitude = GRN_GEO_DEGREE2MSEC(top_left_longitude_in_degree);
  int bottom_right_latitude = GRN_GEO_DEGREE2MSEC(bottom_right_latitude_in_degree);
  int bottom_right_longitude = GRN_GEO_DEGREE2MSEC(bottom_right_longitude_in_degree);
  GRN_GEO_POINT_SET(ctx, &top_left_point,
                    top_left_latitude, top_left_longitude);
  GRN_GEO_POINT_SET(ctx, &bottom_right_point,
                    bottom_right_latitude, bottom_right_longitude);

  DBUG_VOID_RETURN;
}

int ha_mroonga::generic_geo_open_cursor(const uchar *key,
                                        enum ha_rkey_function find_flag)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  int flags = 0;
  if (find_flag & HA_READ_MBR_CONTAIN) {
    grn_obj *index = grn_index_columns[active_index];
    geo_store_rectangle(key);
    cursor_geo = grn_geo_cursor_open_in_rectangle(ctx,
                                                  index,
                                                  &top_left_point,
                                                  &bottom_right_point,
                                                  0, -1);
    if (cursor_geo) {
      if (grn_source_column_geo) {
        grn_obj_unlink(ctx, grn_source_column_geo);
      }
      grn_obj sources;
      GRN_OBJ_INIT(&sources, GRN_BULK, 0, GRN_ID_NIL);
      grn_obj_get_info(ctx, index, GRN_INFO_SOURCE, &sources);
      grn_source_column_geo = grn_ctx_at(ctx, GRN_RECORD_VALUE(&sources));
      grn_obj_unlink(ctx, &sources);
    }
  } else {
    push_warning_unsupported_spatial_index_search(find_flag);
    cursor = grn_table_cursor_open(ctx, grn_table, NULL, 0, NULL, 0,
                                   0, -1, flags);
  }
  if (ctx->rc) {
    error = ER_ERROR_ON_READ;
    my_message(error, ctx->errbuf, MYF(0));
  }
  DBUG_RETURN(error);
}

bool ha_mroonga::is_dry_write()
{
  MRN_DBUG_ENTER_METHOD();
  bool dry_write_p = THDVAR(ha_thd(), dry_write);
  DBUG_RETURN(dry_write_p);
}

bool ha_mroonga::is_enable_optimization()
{
  MRN_DBUG_ENTER_METHOD();
  bool enable_optimization_p = THDVAR(ha_thd(), enable_optimization);
  DBUG_RETURN(enable_optimization_p);
}

bool ha_mroonga::should_normalize(Field *field) const
{
  MRN_DBUG_ENTER_METHOD();
  mrn::FieldNormalizer field_normalizer(ctx, ha_thd(), field);
  bool need_normalize_p = field_normalizer.should_normalize();
  DBUG_RETURN(need_normalize_p);
}

void ha_mroonga::check_count_skip(key_part_map target_key_part_map)
{
  MRN_DBUG_ENTER_METHOD();

  if (!is_enable_optimization()) {
    GRN_LOG(ctx, GRN_LOG_DEBUG,
            "[mroonga][count-skip][false] optimization is disabled");
    count_skip = false;
    DBUG_VOID_RETURN;
  }

  if (thd_sql_command(ha_thd()) != SQLCOM_SELECT) {
    GRN_LOG(ctx, GRN_LOG_DEBUG,
            "[mroonga][count-skip][false] not SELECT");
    count_skip = false;
    DBUG_VOID_RETURN;
  }

  if (share->wrapper_mode &&
      !(wrap_handler->ha_table_flags() & HA_NO_TRANSACTIONS)) {
    GRN_LOG(ctx, GRN_LOG_DEBUG,
            "[mroonga][count-skip][false] wrapped engine is transactional");
    count_skip = false;
    DBUG_VOID_RETURN;
  }

  st_select_lex *select_lex = table->pos_in_table_list->select_lex;
  KEY *key_info = NULL;
  if (active_index != MAX_KEY) {
    key_info = &(table->key_info[active_index]);
  }
  mrn::CountSkipChecker checker(ctx,
                                table,
                                select_lex,
                                key_info,
                                target_key_part_map,
                                !share->wrapper_mode);
  if (checker.check()) {
    count_skip = true;
    mrn_count_skip++;
    DBUG_VOID_RETURN;
  } else {
    count_skip = false;
    DBUG_VOID_RETURN;
  }
}

bool ha_mroonga::is_grn_zero_column_value(grn_obj *column, grn_obj *value)
{
  MRN_DBUG_ENTER_METHOD();

  if (column->header.type != GRN_COLUMN_FIX_SIZE) {
    DBUG_RETURN(false);
  }

  char *bytes = GRN_BULK_HEAD(value);
  unsigned int size = GRN_BULK_VSIZE(value);
  for (unsigned int i = 0; i < size; ++i) {
    if (bytes[i] != '\0') {
      DBUG_RETURN(false);
    }
  }

  DBUG_RETURN(true);
}

bool ha_mroonga::is_primary_key_field(Field *field) const
{
  MRN_DBUG_ENTER_METHOD();

  if (table->s->primary_key == MAX_INDEXES) {
    DBUG_RETURN(false);
  }

  KEY *key_info = &(table->s->key_info[table->s->primary_key]);
  if (KEY_N_KEY_PARTS(key_info) != 1) {
    DBUG_RETURN(false);
  }

  if (strcmp(field->field_name.str,
             key_info->key_part[0].field->field_name.str) == 0) {
    DBUG_RETURN(true);
  } else {
    DBUG_RETURN(false);
  }
}

void ha_mroonga::check_fast_order_limit(grn_table_sort_key **sort_keys,
                                        int *n_sort_keys,
                                        longlong *limit)
{
  MRN_DBUG_ENTER_METHOD();

  if (!is_enable_optimization()) {
    DBUG_PRINT("info", ("mroonga: fast order limit: optimization is disabled"));
    fast_order_limit = false;
    DBUG_VOID_RETURN;
  }

  TABLE_LIST *table_list = table->pos_in_table_list;
  st_select_lex *select_lex = table_list->select_lex;
  SELECT_LEX_UNIT *unit = MRN_TABLE_LIST_GET_DERIVED(table_list);
  st_select_lex *first_select_lex;
  if (unit)
  {
    first_select_lex = unit->first_select();
  } else {
    first_select_lex = select_lex;
  }
  DBUG_PRINT("info",
    ("mroonga: first_select_lex->options=%llu",
     first_select_lex ? MRN_SELECT_LEX_GET_ACTIVE_OPTIONS(first_select_lex) : 0));

  if (
    thd_sql_command(ha_thd()) == SQLCOM_SELECT &&
    !select_lex->with_sum_func &&
    !select_lex->group_list.elements &&
    !MRN_SELECT_LEX_GET_HAVING_COND(select_lex) &&
    select_lex->table_list.elements == 1 &&
    select_lex->order_list.elements &&
    select_lex->limit_params.explicit_limit &&
    select_lex->limit_params.select_limit &&
    select_lex->limit_params.select_limit->val_int() > 0
  ) {
    if (select_lex->limit_params.offset_limit) {
      *limit = select_lex->limit_params.offset_limit->val_int();
    } else {
      *limit = 0;
    }
    *limit += select_lex->limit_params.select_limit->val_int();
    if (*limit > (longlong)INT_MAX) {
      DBUG_PRINT("info",
                 ("mroonga: fast_order_limit = false: "
                  "too long limit: %lld <= %d is required",
                  *limit, INT_MAX));
      fast_order_limit = false;
      DBUG_VOID_RETURN;
    }
    if (first_select_lex &&
        (MRN_SELECT_LEX_GET_ACTIVE_OPTIONS(first_select_lex) & OPTION_FOUND_ROWS)) {
      DBUG_PRINT("info",
                 ("mroonga: fast_order_limit = false: "
                  "SQL_CALC_FOUND_ROWS is specified"));
      fast_order_limit = false;
      DBUG_VOID_RETURN;
    }
    bool is_storage_mode = !(share->wrapper_mode);
    Item *where = MRN_SELECT_LEX_GET_WHERE_COND(select_lex);
    const Item_func *match_against = NULL;
    if (where) {
      mrn::ConditionConverter converter(ctx, grn_table, is_storage_mode);
      if (!converter.is_convertable(where)) {
        DBUG_PRINT("info",
                   ("mroonga: fast_order_limit = false: "
                    "not Groonga layer condition search"));
        fast_order_limit = false;
        DBUG_VOID_RETURN;
      }
      unsigned int n_match_againsts = converter.count_match_against(where);
      if (n_match_againsts == 0) {
        DBUG_PRINT("info",
                   ("mroonga: fast_order_limit = false: "
                    "Groonga layer condition but not fulltext search"));
        fast_order_limit = false;
        DBUG_VOID_RETURN;
      }
      if (n_match_againsts > 1) {
        DBUG_PRINT("info",
                   ("mroonga: fast_order_limit = false: "
                    "MATCH AGAINST must be only one"));
        fast_order_limit = false;
        DBUG_VOID_RETURN;
      }
    }
    int n_max_sort_keys = select_lex->order_list.elements;
    *n_sort_keys = 0;
    size_t sort_keys_size = sizeof(grn_table_sort_key) * n_max_sort_keys;
    *sort_keys = (grn_table_sort_key *)mrn_my_malloc(sort_keys_size,
                                                     MYF(MY_WME));
    memset(*sort_keys, 0, sort_keys_size);
    ORDER *order;
    int i;
    mrn_change_encoding(ctx, system_charset_info);
    for (order = (ORDER *) select_lex->order_list.first, i = 0;
         order;
         order = order->next, i++) {
      Item *item = *order->item;
      if (item->type() == Item::FIELD_ITEM)
      {
        Field *field = static_cast<Item_field *>(item)->field;
        mrn::ColumnName column_name(field->field_name);

        if (should_normalize(field))
        {
          DBUG_PRINT("info", ("mroonga: fast_order_limit = false: "
                              "sort by collated value isn't supported yet."));
          fast_order_limit = false;
          my_free(*sort_keys);
          *sort_keys = NULL;
          *n_sort_keys = 0;
          DBUG_VOID_RETURN;
        }

        if (is_storage_mode) {
          (*sort_keys)[i].key = grn_obj_column(ctx, matched_record_keys,
                                               column_name.c_str(),
                                               column_name.length());
        } else {
          if (is_primary_key_field(field)) {
            (*sort_keys)[i].key = grn_obj_column(ctx, matched_record_keys,
                                                 MRN_COLUMN_NAME_KEY,
                                                 strlen(MRN_COLUMN_NAME_KEY));
          } else {
            DBUG_PRINT("info", ("mroonga: fast_order_limit = false: "
                                "sort by not primary key value "
                                "isn't supported in wrapper mode."));
            fast_order_limit = false;
            my_free(*sort_keys);
            *sort_keys = NULL;
            *n_sort_keys = 0;
            DBUG_VOID_RETURN;
          }
        }
      } else if (!match_against || match_against->eq(item, true)) {
        (*sort_keys)[i].key = grn_obj_column(ctx, matched_record_keys,
                                             MRN_COLUMN_NAME_SCORE,
                                             strlen(MRN_COLUMN_NAME_SCORE));
      } else {
        DBUG_PRINT("info", ("mroonga: fast_order_limit = false: "
                            "sort by computed value isn't supported."));
        fast_order_limit = false;
        my_free(*sort_keys);
        *sort_keys = NULL;
        *n_sort_keys = 0;
        DBUG_VOID_RETURN;
      }
      (*sort_keys)[i].offset = 0;
      if (MRN_ORDER_IS_ASC(order))
      {
        (*sort_keys)[i].flags = GRN_TABLE_SORT_ASC;
      } else {
        (*sort_keys)[i].flags = GRN_TABLE_SORT_DESC;
      }
      (*n_sort_keys)++;
    }
    DBUG_PRINT("info", ("mroonga: fast_order_limit = true"));
    fast_order_limit = true;
    mrn_fast_order_limit++;
    DBUG_VOID_RETURN;
  }
  DBUG_PRINT("info", ("mroonga: fast_order_limit = false"));
  fast_order_limit = false;
  DBUG_VOID_RETURN;
}

int ha_mroonga::generic_store_bulk_fixed_size_string(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  grn_obj_reinit(ctx, buf, GRN_DB_SHORT_TEXT, 0);
  GRN_TEXT_SET(ctx, buf, field->ptr, field->field_length);
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_variable_size_string(Field *field,
                                                        grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  StringBuffer<MAX_FIELD_WIDTH> buffer(field->charset());
  auto value = field->val_str(&buffer, &buffer);
  grn_obj_reinit(ctx, buf, GRN_DB_SHORT_TEXT, 0);
  DBUG_PRINT("info", ("mroonga: length=%" MRN_FORMAT_STRING_LENGTH,
                      value->length()));
  DBUG_PRINT("info", ("mroonga: value=%s", value->c_ptr_safe()));
  GRN_TEXT_SET(ctx, buf, value->ptr(), value->length());
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_integer(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  long long value = field->val_int();
  DBUG_PRINT("info", ("mroonga: value=%lld", value));
  uint32 size = field->pack_length();
  DBUG_PRINT("info", ("mroonga: size=%u", size));
  Field_num *field_num = static_cast<Field_num *>(field);
  bool is_unsigned = field_num->unsigned_flag;
  DBUG_PRINT("info", ("mroonga: is_unsigned=%s", is_unsigned ? "true" : "false"));
  switch (size) {
  case 1:
    if (is_unsigned) {
      grn_obj_reinit(ctx, buf, GRN_DB_UINT8, 0);
      GRN_UINT8_SET(ctx, buf, value);
    } else {
      grn_obj_reinit(ctx, buf, GRN_DB_INT8, 0);
      GRN_INT8_SET(ctx, buf, value);
    }
    break;
  case 2:
    if (is_unsigned) {
      grn_obj_reinit(ctx, buf, GRN_DB_UINT16, 0);
      GRN_UINT16_SET(ctx, buf, value);
    } else {
      grn_obj_reinit(ctx, buf, GRN_DB_INT16, 0);
      GRN_INT16_SET(ctx, buf, value);
    }
    break;
  case 3:
  case 4:
    if (is_unsigned) {
      grn_obj_reinit(ctx, buf, GRN_DB_UINT32, 0);
      GRN_UINT32_SET(ctx, buf, value);
    } else {
      grn_obj_reinit(ctx, buf, GRN_DB_INT32, 0);
      GRN_INT32_SET(ctx, buf, value);
    }
    break;
  case 8:
    if (is_unsigned) {
      grn_obj_reinit(ctx, buf, GRN_DB_UINT64, 0);
      GRN_UINT64_SET(ctx, buf, value);
    } else {
      grn_obj_reinit(ctx, buf, GRN_DB_INT64, 0);
      GRN_INT64_SET(ctx, buf, value);
    }
    break;
  default:
    // Why!?
    error = HA_ERR_UNSUPPORTED;
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "unknown integer value size: <%u>: "
             "available sizes: [1, 2, 3, 4, 8]",
             size);
    push_warning(ha_thd(), MRN_SEVERITY_WARNING,
                 error, error_message);
    break;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_unsigned_integer(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  long long signed_value = field->val_int();
  unsigned long long unsigned_value = *((unsigned long long *)(&signed_value));
  uint32 size = field->pack_length();
  switch (size) {
  case 1:
    grn_obj_reinit(ctx, buf, GRN_DB_UINT8, 0);
    GRN_UINT8_SET(ctx, buf, unsigned_value);
    break;
  case 2:
    grn_obj_reinit(ctx, buf, GRN_DB_UINT16, 0);
    GRN_UINT16_SET(ctx, buf, unsigned_value);
    break;
  case 3:
  case 4:
    grn_obj_reinit(ctx, buf, GRN_DB_UINT32, 0);
    GRN_UINT32_SET(ctx, buf, unsigned_value);
    break;
  case 8:
    grn_obj_reinit(ctx, buf, GRN_DB_UINT64, 0);
    GRN_UINT64_SET(ctx, buf, unsigned_value);
    break;
  default:
    // Why!?
    error = HA_ERR_UNSUPPORTED;
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "unknown unsigned integer value size: <%u>: "
             "available sizes: [1, 2, 3, 4, 8]",
             size);
    push_warning(ha_thd(), MRN_SEVERITY_WARNING,
                 error, error_message);
    break;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_float(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  double value = field->val_real();
  uint32 size = field->pack_length();
  switch (size) {
  case 4:
  case 8:
    grn_obj_reinit(ctx, buf, GRN_DB_FLOAT, 0);
    GRN_FLOAT_SET(ctx, buf, value);
    break;
  default:
    // Why!?
    error = HA_ERR_UNSUPPORTED;
    char error_message[MRN_MESSAGE_BUFFER_SIZE];
    snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
             "unknown float value size: <%u>: "
             "available sizes: [4, 8]",
             size);
    push_warning(ha_thd(), MRN_SEVERITY_WARNING,
                 error, error_message);
    break;
  }
  DBUG_RETURN(error);
}

long long int ha_mroonga::get_grn_time_from_timestamp_field(Field_timestamp *field)
{
  MRN_DBUG_ENTER_METHOD();
  long long int grn_time = 0;
#ifdef MRN_TIMESTAMP_USE_TIMEVAL
  int warnings = 0;
  struct timeval time_value;
  if (field->get_timestamp(&time_value, &warnings)) {
    // XXX: Should we report warnings or MySQL does?
  } else {
    DBUG_PRINT("info", ("mroonga: timeval tv_sec=%ld", time_value.tv_sec));
    grn_time = GRN_TIME_PACK(time_value.tv_sec, time_value.tv_usec);
  }
#elif defined(MRN_TIMESTAMP_USE_MY_TIME_T)
  unsigned long int micro_seconds;
  my_time_t seconds = field->get_timestamp(&micro_seconds);
  DBUG_PRINT("info", ("mroonga: my_time_t seconds=%ld", seconds));
  grn_time = GRN_TIME_PACK(seconds, micro_seconds);
#else
  my_bool is_null_value;
  long seconds = field->get_timestamp(&is_null_value);
  DBUG_PRINT("info", ("mroonga: long seconds=%ld", seconds));
  grn_time = GRN_TIME_PACK(seconds, 0);
#endif
  DBUG_RETURN(grn_time);
}

int ha_mroonga::generic_store_bulk_timestamp(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  Field_timestamp *timestamp_field = (Field_timestamp *)field;
  long long int time = get_grn_time_from_timestamp_field(timestamp_field);
  grn_obj_reinit(ctx, buf, GRN_DB_TIME, 0);
  GRN_TIME_SET(ctx, buf, time);
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_date(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  long long int date_value = field->val_int();
  struct tm date;
  memset(&date, 0, sizeof(struct tm));
  date.tm_year = date_value / 10000 % 10000 - mrn::TimeConverter::TM_YEAR_BASE;
  date.tm_mon = date_value / 100 % 100 - 1;
  date.tm_mday = date_value % 100;
  int usec = 0;
  mrn::TimeConverter time_converter;
  long long int time = time_converter.tm_to_grn_time(&date, usec, &truncated);
  if (truncated) {
    field->set_warning(MRN_SEVERITY_WARNING,
                       WARN_DATA_TRUNCATED, 1);
  }
  grn_obj_reinit(ctx, buf, GRN_DB_TIME, 0);
  GRN_TIME_SET(ctx, buf, time);
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_time(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  Field_time *time_field = (Field_time *)field;
  MYSQL_TIME mysql_time;
  time_field->get_date(&mysql_time, Time::Options(current_thd));
  mrn::TimeConverter time_converter;
  long long int time = time_converter.mysql_time_to_grn_time(&mysql_time,
                                                             &truncated);
  if (truncated) {
    field->set_warning(MRN_SEVERITY_WARNING,
                       WARN_DATA_TRUNCATED, 1);
  }
  grn_obj_reinit(ctx, buf, GRN_DB_TIME, 0);
  GRN_TIME_SET(ctx, buf, time);
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_datetime(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  Field_datetime *datetime_field = (Field_datetime *)field;
  MYSQL_TIME mysql_time;
  datetime_field->get_date(&mysql_time, Time::Options(current_thd));
  mrn::TimeConverter time_converter;
  long long int time = time_converter.mysql_time_to_grn_time(&mysql_time,
                                                             &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  grn_obj_reinit(ctx, buf, GRN_DB_TIME, 0);
  GRN_TIME_SET(ctx, buf, time);
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_year(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;

  int year;
  if (field->field_length == 2) {
    year = static_cast<int>(field->val_int() + 2000);
  } else {
    year = static_cast<int>(field->val_int());
  }

  DBUG_PRINT("info", ("mroonga: year=%d", year));
  struct tm date;
  memset(&date, 0, sizeof(struct tm));
  date.tm_year = year - mrn::TimeConverter::TM_YEAR_BASE;
  date.tm_mon = 0;
  date.tm_mday = 1;

  int usec = 0;
  mrn::TimeConverter time_converter;
  long long int time = time_converter.tm_to_grn_time(&date, usec, &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  grn_obj_reinit(ctx, buf, GRN_DB_TIME, 0);
  GRN_TIME_SET(ctx, buf, time);
  DBUG_RETURN(error);
}

#ifdef MRN_HAVE_MYSQL_TYPE_DATETIME2
int ha_mroonga::generic_store_bulk_datetime2(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  Field_datetimef *datetimef_field = (Field_datetimef *)field;
  MYSQL_TIME mysql_time;
  datetimef_field->get_date(&mysql_time, Time::Options(current_thd));
  mrn::TimeConverter time_converter;
  long long int time = time_converter.mysql_time_to_grn_time(&mysql_time,
                                                             &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  grn_obj_reinit(ctx, buf, GRN_DB_TIME, 0);
  GRN_TIME_SET(ctx, buf, time);
  DBUG_RETURN(error);
}
#endif

#ifdef MRN_HAVE_MYSQL_TYPE_TIME2
int ha_mroonga::generic_store_bulk_time2(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  MYSQL_TIME mysql_time;
  field->get_date(&mysql_time, Time::Options(current_thd));
  mrn::TimeConverter time_converter;
  long long int time = time_converter.mysql_time_to_grn_time(&mysql_time,
                                                             &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  grn_obj_reinit(ctx, buf, GRN_DB_TIME, 0);
  GRN_TIME_SET(ctx, buf, time);
  DBUG_RETURN(error);
}
#endif

int ha_mroonga::generic_store_bulk_new_date(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  Field_newdate *newdate_field = (Field_newdate *)field;
  MYSQL_TIME mysql_date;
  newdate_field->get_date(&mysql_date, Time::Options(current_thd));
  mrn::TimeConverter time_converter;
  long long int time = time_converter.mysql_time_to_grn_time(&mysql_date,
                                                             &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  grn_obj_reinit(ctx, buf, GRN_DB_TIME, 0);
  GRN_TIME_SET(ctx, buf, time);
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_new_decimal(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  String value;
  Field_new_decimal *new_decimal_field = (Field_new_decimal *)field;
  new_decimal_field->val_str(&value, NULL);
  grn_obj_reinit(ctx, buf, GRN_DB_SHORT_TEXT, 0);
  GRN_TEXT_SET(ctx, buf, value.ptr(), value.length());
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_blob(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  StringBuffer<MAX_FIELD_WIDTH> buffer(field->charset());
  auto value = field->val_str(&buffer, &buffer);
  grn_obj_reinit(ctx, buf, GRN_DB_TEXT, 0);
  GRN_TEXT_SET(ctx, buf, value->ptr(), value->length());
  DBUG_RETURN(error);
}

int ha_mroonga::generic_store_bulk_geometry(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
#ifdef MRN_HAVE_SPATIAL
  String buffer;
  Field_blob *geometry = (Field_blob *)field;
  String *value = geometry->val_str(0, &buffer);
  const char *wkb = value->ptr();
  int len = value->length();
  error = mrn_set_geometry(ctx, buf, wkb, len);
#endif
  DBUG_RETURN(error);
}

#ifdef MRN_HAVE_MYSQL_TYPE_JSON
int ha_mroonga::generic_store_bulk_json(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  String buffer;
  Field_json *json = static_cast<Field_json *>(field);
  String *value = json->val_str(&buffer, NULL);
  grn_obj_reinit(ctx, buf, GRN_DB_TEXT, 0);
  GRN_TEXT_SET(ctx, buf, value->ptr(), value->length());
  DBUG_RETURN(error);
}
#endif

int ha_mroonga::generic_store_bulk(Field *field, grn_obj *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error;
  error = mrn_change_encoding(ctx, field->charset());
  if (error)
    return error;
  switch (field->real_type()) {
  case MYSQL_TYPE_DECIMAL:
    error = generic_store_bulk_variable_size_string(field, buf);
    break;
  case MYSQL_TYPE_TINY:
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_LONG:
    error = generic_store_bulk_integer(field, buf);
    break;
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
    error = generic_store_bulk_float(field, buf);
    break;
  case MYSQL_TYPE_NULL:
    error = generic_store_bulk_unsigned_integer(field, buf);
    break;
  case MYSQL_TYPE_TIMESTAMP:
    error = generic_store_bulk_timestamp(field, buf);
    break;
  case MYSQL_TYPE_LONGLONG:
  case MYSQL_TYPE_INT24:
    error = generic_store_bulk_integer(field, buf);
    break;
  case MYSQL_TYPE_DATE:
    error = generic_store_bulk_date(field, buf);
    break;
  case MYSQL_TYPE_TIME:
    error = generic_store_bulk_time(field, buf);
    break;
  case MYSQL_TYPE_DATETIME:
    error = generic_store_bulk_datetime(field, buf);
    break;
  case MYSQL_TYPE_YEAR:
    error = generic_store_bulk_year(field, buf);
    break;
  case MYSQL_TYPE_NEWDATE:
    error = generic_store_bulk_new_date(field, buf);
    break;
  case MYSQL_TYPE_VARCHAR:
    error = generic_store_bulk_variable_size_string(field, buf);
    break;
  case MYSQL_TYPE_BIT:
    error = generic_store_bulk_unsigned_integer(field, buf);
    break;
#ifdef MRN_HAVE_MYSQL_TYPE_TIMESTAMP2
  case MYSQL_TYPE_TIMESTAMP2:
    error = generic_store_bulk_timestamp(field, buf);
    break;
#endif
#ifdef MRN_HAVE_MYSQL_TYPE_DATETIME2
  case MYSQL_TYPE_DATETIME2:
    error = generic_store_bulk_datetime2(field, buf);
    break;
#endif
#ifdef MRN_HAVE_MYSQL_TYPE_TIME2
  case MYSQL_TYPE_TIME2:
    error = generic_store_bulk_time2(field, buf);
    break;
#endif
  case MYSQL_TYPE_NEWDECIMAL:
    error = generic_store_bulk_new_decimal(field, buf);
    break;
  case MYSQL_TYPE_ENUM:
    error = generic_store_bulk_unsigned_integer(field, buf);
    break;
  case MYSQL_TYPE_SET:
    error = generic_store_bulk_unsigned_integer(field, buf);
    break;
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
    error = generic_store_bulk_blob(field, buf);
    break;
  case MYSQL_TYPE_VAR_STRING:
    error = generic_store_bulk_variable_size_string(field, buf);
    break;
  case MYSQL_TYPE_STRING:
    error = generic_store_bulk_fixed_size_string(field, buf);
    break;
  case MYSQL_TYPE_GEOMETRY:
    error = generic_store_bulk_geometry(field, buf);
    break;
#ifdef MRN_HAVE_MYSQL_TYPE_JSON
  case MYSQL_TYPE_JSON:
    error = generic_store_bulk_json(field, buf);
    break;
#endif
  default:
    error = HA_ERR_UNSUPPORTED;
    break;
  }
  DBUG_RETURN(error);
}

void ha_mroonga::storage_store_field_string(Field *field,
                                            const char *value,
                                            uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  field->store(value, value_length, field->charset());
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_integer(Field *field,
                                             const char *value,
                                             uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  Field_num *field_num = static_cast<Field_num *>(field);
  bool is_unsigned = field_num->unsigned_flag;
  switch (value_length) {
  case 1:
    {
      if (is_unsigned) {
        unsigned char field_value;
        field_value = *((unsigned char *)value);
        field->store(field_value, is_unsigned);
      } else {
        signed char field_value;
        field_value = *((signed char *)value);
        field->store(field_value, is_unsigned);
      }
      break;
    }
  case 2:
    {
      if (is_unsigned) {
        unsigned short field_value;
        field_value = *((unsigned short *)value);
        field->store(field_value, is_unsigned);
      } else {
        short field_value;
        field_value = *((short *)value);
        field->store(field_value, is_unsigned);
      }
      break;
    }
  case 4:
    {
      if (is_unsigned) {
        unsigned int field_value;
        field_value = *((unsigned int *)value);
        field->store(field_value, is_unsigned);
      } else {
        int field_value;
        field_value = *((int *)value);
        field->store(field_value, is_unsigned);
      }
      break;
    }
  case 8:
    {
      if (is_unsigned) {
        unsigned long long int field_value;
        field_value = *((unsigned long long int *)value);
        DBUG_PRINT("info", ("mroonga: field_value=%llu", field_value));
        field->store(field_value, is_unsigned);
      } else {
        long long int field_value;
        field_value = *((long long int *)value);
        field->store(field_value, is_unsigned);
      }
      break;
    }
  default:
    {
      // Why!?
      char error_message[MRN_MESSAGE_BUFFER_SIZE];
      snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
               "unknown integer value size: <%d>: "
               "available sizes: [1, 2, 4, 8]",
               value_length);
      push_warning(ha_thd(), MRN_SEVERITY_WARNING,
                   HA_ERR_UNSUPPORTED, error_message);
      storage_store_field_string(field, value, value_length);
      break;
    }
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_unsigned_integer(Field *field,
                                                      const char *value,
                                                      uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  switch (value_length) {
  case 1:
    {
      unsigned char field_value;
      field_value = *((unsigned char *)value);
      field->store(field_value, true);
      break;
    }
  case 2:
    {
      unsigned short field_value;
      field_value = *((unsigned short *)value);
      field->store(field_value, true);
      break;
    }
  case 4:
    {
      unsigned int field_value;
      field_value = *((unsigned int *)value);
      field->store(field_value, true);
      break;
    }
  case 8:
    {
      unsigned long long int field_value;
      field_value = *((unsigned long long int *)value);
      DBUG_PRINT("info", ("mroonga: field_value=%llu", field_value));
      field->store(field_value, true);
      break;
    }
  default:
    {
      // Why!?
      char error_message[MRN_MESSAGE_BUFFER_SIZE];
      snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
               "unknown integer value size: <%d>: "
               "available sizes: [1, 2, 4, 8]",
               value_length);
      push_warning(ha_thd(), MRN_SEVERITY_WARNING,
                   HA_ERR_UNSUPPORTED, error_message);
      storage_store_field_string(field, value, value_length);
      break;
    }
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_float(Field *field,
                                           const char *value,
                                           uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  double field_value;
  field_value = *((double *)value);
  field->store(field_value);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_timestamp(Field *field,
                                               const char *value,
                                               uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  long long int time = *((long long int *)value);
  Field_timestamp *timestamp_field = (Field_timestamp *)field;
#ifdef MRN_TIMESTAMP_USE_TIMEVAL
  struct timeval time_value;
  GRN_TIME_UNPACK(time, time_value.tv_sec, time_value.tv_usec);
  timestamp_field->store_timestamp(&time_value);
#elif defined(MRN_TIMESTAMP_USE_MY_TIME_T)
  long long int sec, usec;
  GRN_TIME_UNPACK(time, sec, usec);
  timestamp_field->store_TIME(static_cast<int32>(sec),
                              static_cast<int32>(usec));
#else
  int32 sec, usec __attribute__((unused));
  GRN_TIME_UNPACK(time, sec, usec);
  timestamp_field->store_timestamp(sec);
#endif
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_date(Field *field,
                                          const char *value,
                                          uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  long long int time = *((long long int *)value);
  long long int sec, usec __attribute__((unused));
  GRN_TIME_UNPACK(time, sec, usec);
  struct tm date;
  time_t sec_t = static_cast<int32>(sec);
  gmtime_r(&sec_t, &date);
  long long int date_in_mysql =
    (date.tm_year + mrn::TimeConverter::TM_YEAR_BASE) * 10000 +
    (date.tm_mon + 1) * 100 +
    date.tm_mday;
  field->store(date_in_mysql, false);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_time(Field *field,
                                          const char *value,
                                          uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  long long int time = *((long long int *)value);
  MYSQL_TIME mysql_time;
  memset(&mysql_time, 0, sizeof(MYSQL_TIME));
  mysql_time.time_type = MYSQL_TIMESTAMP_TIME;
  mrn::TimeConverter time_converter;
  time_converter.grn_time_to_mysql_time(time, &mysql_time);
#ifdef MRN_FIELD_STORE_TIME_NEED_TYPE
  Field_time *time_field = (Field_time *)field;
  time_field->store_time(&mysql_time, mysql_time.time_type);
#else
  field->store_time(&mysql_time);
#endif
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_datetime(Field *field,
                                              const char *value,
                                              uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  long long int time = *((long long int *)value);
  MYSQL_TIME mysql_datetime;
  memset(&mysql_datetime, 0, sizeof(MYSQL_TIME));
  mysql_datetime.time_type = MYSQL_TIMESTAMP_DATETIME;
  mrn::TimeConverter time_converter;
  time_converter.grn_time_to_mysql_time(time, &mysql_datetime);
#ifdef MRN_FIELD_STORE_TIME_NEED_TYPE
  Field_datetime *datetime_field = (Field_datetime *)field;
  datetime_field->store_time(&mysql_datetime, mysql_datetime.time_type);
#else
  field->store_time(&mysql_datetime);
#endif
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_year(Field *field,
                                          const char *value,
                                          uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  long long int time = *((long long int *)value);
  MYSQL_TIME mysql_time;
  memset(&mysql_time, 0, sizeof(MYSQL_TIME));
  mysql_time.time_type = MYSQL_TIMESTAMP_DATE;
  mrn::TimeConverter time_converter;
  time_converter.grn_time_to_mysql_time(time, &mysql_time);
  DBUG_PRINT("info", ("mroonga: stored %d", mysql_time.year));
  field->store(mysql_time.year, false);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_new_date(Field *field,
                                              const char *value,
                                              uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  long long int time = *((long long int *)value);
  MYSQL_TIME mysql_date;
  memset(&mysql_date, 0, sizeof(MYSQL_TIME));
  mysql_date.time_type = MYSQL_TIMESTAMP_DATE;
  mrn::TimeConverter time_converter;
  time_converter.grn_time_to_mysql_time(time, &mysql_date);
#ifdef MRN_FIELD_STORE_TIME_NEED_TYPE
  Field_newdate *newdate_field = (Field_newdate *)field;
  newdate_field->store_time(&mysql_date, MYSQL_TIMESTAMP_DATE);
#else
  field->store_time(&mysql_date);
#endif
  DBUG_VOID_RETURN;
}

#ifdef MRN_HAVE_MYSQL_TYPE_DATETIME2
void ha_mroonga::storage_store_field_datetime2(Field *field,
                                               const char *value,
                                               uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  long long int time = *((long long int *)value);
  MYSQL_TIME mysql_datetime;
  memset(&mysql_datetime, 0, sizeof(MYSQL_TIME));
  mysql_datetime.time_type = MYSQL_TIMESTAMP_DATETIME;
  mrn::TimeConverter time_converter;
  time_converter.grn_time_to_mysql_time(time, &mysql_datetime);
  field->store_time(&mysql_datetime);
  DBUG_VOID_RETURN;
}
#endif

#ifdef MRN_HAVE_MYSQL_TYPE_TIME2
void ha_mroonga::storage_store_field_time2(Field *field,
                                           const char *value,
                                           uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  long long int time = *((long long int *)value);

  MYSQL_TIME mysql_time;
  memset(&mysql_time, 0, sizeof(MYSQL_TIME));
  mysql_time.time_type = MYSQL_TIMESTAMP_TIME;
  mrn::TimeConverter time_converter;
  time_converter.grn_time_to_mysql_time(time, &mysql_time);
  field->store_time(&mysql_time);
  DBUG_VOID_RETURN;
}
#endif

void ha_mroonga::storage_store_field_blob(Field *field,
                                          const char *value,
                                          uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  Field_blob *blob = (Field_blob *)field;
  String *blob_buffer = &blob_buffers[field->field_index];
  blob_buffer->length(0);
  blob_buffer->reserve(value_length);
  blob_buffer->q_append(value, value_length);
  blob->set_ptr((uint32) value_length, (uchar *) blob_buffer->ptr());
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_field_geometry(Field *field,
                                              const char *value,
                                              uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
#ifdef MRN_HAVE_SPATIAL
  uchar wkb[SRID_SIZE + WKB_HEADER_SIZE + POINT_DATA_SIZE];
  grn_geo_point *field_value = (grn_geo_point *)value;
  int latitude, longitude;
  latitude = field_value->latitude;
  longitude = field_value->longitude;
  if (grn_source_column_geo) {
    GRN_GEO_POINT_SET(ctx, &source_point, latitude, longitude);
  }
  memset(wkb, 0, SRID_SIZE);
  memset(wkb + SRID_SIZE, Geometry::wkb_ndr, 1); // wkb_ndr is meaningless.
  int4store(wkb + SRID_SIZE + 1, Geometry::wkb_point);
  double latitude_in_degree, longitude_in_degree;
  latitude_in_degree = GRN_GEO_MSEC2DEGREE(latitude);
  longitude_in_degree = GRN_GEO_MSEC2DEGREE(longitude);
  float8store(wkb + SRID_SIZE + WKB_HEADER_SIZE,
              longitude_in_degree);
  float8store(wkb + SRID_SIZE + WKB_HEADER_SIZE + SIZEOF_STORED_DOUBLE,
              latitude_in_degree);
  String *geometry_buffer = &blob_buffers[field->field_index];
  geometry_buffer->length(0);
  uint wkb_length = sizeof(wkb) / sizeof(*wkb);
  Field_blob *geometry= (Field_blob *)field;
  geometry_buffer->reserve(wkb_length);
  geometry_buffer->q_append((const char *) wkb, wkb_length);
  geometry->set_ptr((uint32) wkb_length, (uchar *) geometry_buffer->ptr());
#endif
  DBUG_VOID_RETURN;
}

#ifdef MRN_HAVE_MYSQL_TYPE_JSON
void ha_mroonga::storage_store_field_json(Field *field,
                                          const char *value,
                                          uint value_length)
{
  MRN_DBUG_ENTER_METHOD();
  Field_json *json = static_cast<Field_json *>(field);
  json->store(value, value_length, field->charset());
  DBUG_VOID_RETURN;
}
#endif

void ha_mroonga::storage_store_field(Field *field,
                                     const char *value, uint value_length)
{
  field->set_notnull();
  switch (field->real_type()) {
  case MYSQL_TYPE_DECIMAL:
    storage_store_field_string(field, value, value_length);
    break;
  case MYSQL_TYPE_TINY:
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_LONG:
    storage_store_field_integer(field, value, value_length);
    break;
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
    storage_store_field_float(field, value, value_length);
    break;
  case MYSQL_TYPE_NULL:
    storage_store_field_unsigned_integer(field, value, value_length);
    break;
  case MYSQL_TYPE_TIMESTAMP:
    storage_store_field_timestamp(field, value, value_length);
    break;
  case MYSQL_TYPE_LONGLONG:
  case MYSQL_TYPE_INT24:
    storage_store_field_integer(field, value, value_length);
    break;
  case MYSQL_TYPE_DATE:
    storage_store_field_date(field, value, value_length);
    break;
  case MYSQL_TYPE_TIME:
    storage_store_field_time(field, value, value_length);
    break;
  case MYSQL_TYPE_DATETIME:
    storage_store_field_datetime(field, value, value_length);
    break;
  case MYSQL_TYPE_YEAR:
    storage_store_field_year(field, value, value_length);
    break;
  case MYSQL_TYPE_NEWDATE:
    storage_store_field_new_date(field, value, value_length);
    break;
  case MYSQL_TYPE_VARCHAR:
    storage_store_field_string(field, value, value_length);
    break;
  case MYSQL_TYPE_BIT:
    storage_store_field_unsigned_integer(field, value, value_length);
    break;
#ifdef MRN_HAVE_MYSQL_TYPE_TIMESTAMP2
  case MYSQL_TYPE_TIMESTAMP2:
    storage_store_field_timestamp(field, value, value_length);
    break;
#endif
#ifdef MRN_HAVE_MYSQL_TYPE_DATETIME2
  case MYSQL_TYPE_DATETIME2:
    storage_store_field_datetime2(field, value, value_length);
    break;
#endif
#ifdef MRN_HAVE_MYSQL_TYPE_TIME2
  case MYSQL_TYPE_TIME2:
    storage_store_field_time2(field, value, value_length);
    break;
#endif
  case MYSQL_TYPE_NEWDECIMAL:
    storage_store_field_string(field, value, value_length);
    break;
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
    storage_store_field_unsigned_integer(field, value, value_length);
    break;
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
    storage_store_field_blob(field, value, value_length);
    break;
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
    storage_store_field_string(field, value, value_length);
    break;
  case MYSQL_TYPE_GEOMETRY:
    storage_store_field_geometry(field, value, value_length);
    break;
  case MYSQL_TYPE_VARCHAR_COMPRESSED:
  case MYSQL_TYPE_BLOB_COMPRESSED:
    DBUG_ASSERT(0);
#ifdef MRN_HAVE_MYSQL_TYPE_JSON
  case MYSQL_TYPE_JSON:
    storage_store_field_json(field, value, value_length);
    break;
#endif
  }
}

void ha_mroonga::storage_store_field_column(Field *field, bool is_primary_key,
                                            int nth_column, grn_id record_id)
{
  MRN_DBUG_ENTER_METHOD();

  if (!grn_columns[nth_column]) {
    DBUG_VOID_RETURN;
  }

  grn_obj *column = grn_columns[nth_column];
  grn_id range_id = grn_obj_get_range(ctx, column);
  grn_obj *range = grn_column_ranges[nth_column];
  grn_obj *value = &new_value_buffer;

  if (mrn::grn::is_table(range)) {
    if (mrn::grn::is_vector_column(column)) {
      grn_obj_reinit(ctx, value, range_id, GRN_OBJ_VECTOR);
      grn_obj_get_value(ctx, column, record_id, value);

      grn_obj unvectored_value;
      GRN_TEXT_INIT(&unvectored_value, 0);
      int n_ids = GRN_BULK_VSIZE(value) / sizeof(grn_id);
      for (int i = 0; i < n_ids; i++) {
        grn_id id = GRN_RECORD_VALUE_AT(value, i);
        if (i > 0) {
          GRN_TEXT_PUTS(ctx, &unvectored_value, mrn_vector_column_delimiter);
        }
        char key[GRN_TABLE_MAX_KEY_SIZE];
        int key_length;
        key_length = grn_table_get_key(ctx, range, id,
                                       &key, GRN_TABLE_MAX_KEY_SIZE);
        GRN_TEXT_PUT(ctx, &unvectored_value, key, key_length);
      }
      storage_store_field(field,
                          GRN_TEXT_VALUE(&unvectored_value),
                          GRN_TEXT_LEN(&unvectored_value));
      GRN_OBJ_FIN(ctx, &unvectored_value);
    } else {
      grn_obj_reinit(ctx, value, range_id, 0);
      grn_obj_get_value(ctx, column, record_id, value);

      grn_id id = GRN_RECORD_VALUE(value);
      char key[GRN_TABLE_MAX_KEY_SIZE];
      int key_length;
      key_length = grn_table_get_key(ctx, range, id,
                                     &key, GRN_TABLE_MAX_KEY_SIZE);
      storage_store_field(field, key, key_length);
    }
  } else {
    grn_obj_reinit(ctx, value, range_id, 0);
    grn_obj_get_value(ctx, column, record_id, value);
    if (is_primary_key && GRN_BULK_VSIZE(value) == 0) {
      char key[GRN_TABLE_MAX_KEY_SIZE];
      int key_length;
      key_length = grn_table_get_key(ctx, grn_table, record_id,
                                     &key, GRN_TABLE_MAX_KEY_SIZE);
      storage_store_field(field, key, key_length);
    } else {
      storage_store_field(field, GRN_BULK_HEAD(value), GRN_BULK_VSIZE(value));
    }
  }

  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_fields(uchar *buf, grn_id record_id)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_PRINT("info", ("mroonga: stored record ID: %d", record_id));

  my_ptrdiff_t ptr_diff = PTR_BYTE_DIFF(buf, table->record[0]);

  Field *primary_key_field = NULL;
  if (table->s->primary_key != MAX_INDEXES) {
    KEY *key_info = &(table->s->key_info[table->s->primary_key]);
    if (KEY_N_KEY_PARTS(key_info) == 1) {
      primary_key_field = key_info->key_part[0].field;
    }
  }

  int i;
  int n_columns = table->s->fields;
  for (i = 0; i < n_columns; i++) {
    Field *field = table->field[i];

    if (bitmap_is_set(table->read_set, field->field_index) ||
        bitmap_is_set(table->write_set, field->field_index)) {
      const char *column_name = field->field_name.str;

      if (ignoring_no_key_columns) {
        KEY *key_info = &(table->s->key_info[active_index]);
        if (strcmp(key_info->key_part[0].field->field_name.str, column_name)) {
          continue;
        }
      }

      mrn::DebugColumnAccess debug_column_access(table, &table->write_set);
      DBUG_PRINT("info", ("mroonga: store column %d(%d)",i,field->field_index));
      field->move_field_offset(ptr_diff);
      if (strcmp(MRN_COLUMN_NAME_ID, column_name) == 0) {
        // for _id column
        field->set_notnull();
        field->store((int)record_id);
      } else if (primary_key_field &&
                 strcmp(primary_key_field->field_name.str, column_name) == 0) {
        // for primary key column
        storage_store_field_column(field, true, i, record_id);
      } else {
        storage_store_field_column(field, false, i, record_id);
      }
      field->move_field_offset(-ptr_diff);
    }
  }

  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_fields_for_prep_update(const uchar *old_data,
                                                      const uchar *new_data,
                                                      grn_id record_id)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_PRINT("info", ("mroonga: stored record ID: %d", record_id));
  my_ptrdiff_t ptr_diff_old = PTR_BYTE_DIFF(old_data, table->record[0]);
  my_ptrdiff_t ptr_diff_new = 0;
#ifdef MRN_RBR_UPDATE_NEED_ALL_COLUMNS
  if (!written_by_row_based_binlog) {
    if (check_written_by_row_based_binlog()) {
      written_by_row_based_binlog = 2;
    } else {
      written_by_row_based_binlog = 1;
    }
  }
  bool need_all_columns =
    (new_data && written_by_row_based_binlog == 2);
#endif
  if (new_data) {
    ptr_diff_new = PTR_BYTE_DIFF(new_data, table->record[0]);
  }
  int i;
  int n_columns = table->s->fields;
  for (i = 0; i < n_columns; i++) {
    Field *field = table->field[i];

#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      continue;
    }
#endif
    if (
      !bitmap_is_set(table->read_set, field->field_index) &&
      !bitmap_is_set(table->write_set, field->field_index) &&
#ifdef MRN_RBR_UPDATE_NEED_ALL_COLUMNS
      (
        need_all_columns ||
#endif
        bitmap_is_set(&multiple_column_key_bitmap, field->field_index)
#ifdef MRN_RBR_UPDATE_NEED_ALL_COLUMNS
      )
#endif
    ) {
      mrn::DebugColumnAccess debug_column_access(table, &table->write_set);
      DBUG_PRINT("info", ("mroonga: store column %d(%d)",i,field->field_index));
      grn_obj value;
      GRN_OBJ_INIT(&value, GRN_BULK, 0, grn_obj_get_range(ctx, grn_columns[i]));
      grn_obj_get_value(ctx, grn_columns[i], record_id, &value);
      // old column
      field->move_field_offset(ptr_diff_old);
      storage_store_field(field, GRN_BULK_HEAD(&value), GRN_BULK_VSIZE(&value));
      field->move_field_offset(-ptr_diff_old);
      if (new_data) {
        // new column
        field->move_field_offset(ptr_diff_new);
        storage_store_field(field, GRN_BULK_HEAD(&value), GRN_BULK_VSIZE(&value));
        field->move_field_offset(-ptr_diff_new);
      }
      GRN_OBJ_FIN(ctx, &value);
    }
  }

  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_store_fields_by_index(uchar *buf)
{
  MRN_DBUG_ENTER_METHOD();
  uint key_length;
  void *key;
  KEY *key_info = &table->key_info[active_index];
  if (table->s->primary_key == active_index)
    key_length = grn_table_cursor_get_key(ctx, cursor, &key);
  else
    key_length = grn_table_cursor_get_key(ctx, index_table_cursor, &key);

  if (KEY_N_KEY_PARTS(key_info) == 1) {
    my_ptrdiff_t ptr_diff = PTR_BYTE_DIFF(buf, table->record[0]);
    Field *field = key_info->key_part->field;
    mrn::DebugColumnAccess debug_column_access(table, &table->write_set);
    field->move_field_offset(ptr_diff);
    storage_store_field(field, (const char *)key, key_length);
    field->move_field_offset(-ptr_diff);
  } else {
    uchar enc_buf[MAX_KEY_LENGTH];
    uint enc_len;
    mrn::MultipleColumnKeyCodec codec(ctx, ha_thd(), key_info);
    codec.decode(static_cast<uchar *>(key), key_length, enc_buf, &enc_len);
    key_restore(buf, enc_buf, key_info, enc_len);
  }
  DBUG_VOID_RETURN;
}

int ha_mroonga::storage_encode_key_normalize_min_sort_chars(Field *field,
                                                            uchar *buf,
                                                            uint size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  if (size == 0) {
    DBUG_RETURN(0);
  }
  if (!field->has_charset()) {
    DBUG_RETURN(0);
  }

  uint16 raw_min_sort_char =
    static_cast<uint16>(field->sort_charset()->min_sort_char);
  if (raw_min_sort_char <= UINT_MAX8) {
    uchar min_sort_char = static_cast<uchar>(raw_min_sort_char);
    for (uint i = size - 1; i > 0; --i) {
      if (buf[i] != min_sort_char) {
        break;
      }
      buf[i] = '\0';
    }
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_key_fixed_size_string(Field *field,
                                                     const uchar *key,
                                                     uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  memcpy(buf, key, field->field_length);
  *size = field->field_length;
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_key_variable_size_string(Field *field,
                                                        const uchar *key,
                                                        uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  *size = uint2korr(key);
  memcpy(buf, key + HA_KEY_BLOB_LENGTH, *size);
  storage_encode_key_normalize_min_sort_chars(field, buf, *size);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_key_timestamp(Field *field, const uchar *key,
                                             uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  long long int time;
  MYSQL_TIME mysql_time;
#ifdef MRN_MARIADB_P
  if (field->decimals() == 0) {
    my_time_t my_time = sint4korr(key);
    mrn_my_tz_UTC->gmt_sec_to_TIME(&mysql_time, my_time);
    mysql_time.second_part = 0;
  } else {
    Field_timestamp_hires *timestamp_hires_field =
      (Field_timestamp_hires *)field;
    uchar *ptr_backup = field->ptr;
    uchar *null_ptr_backup = field->null_ptr;
    TABLE *table_backup = field->table;
    field->ptr = (uchar *)key;
    field->null_ptr = (uchar *)(key - 1);
    field->table = table;
    Temporal::Options opt(TIME_CONV_NONE, current_thd);
    timestamp_hires_field->get_date(&mysql_time, opt);
    field->ptr = ptr_backup;
    field->null_ptr = null_ptr_backup;
    field->table = table_backup;
  }
#else
  my_time_t my_time = uint4korr(key);
  mrn_my_tz_UTC->gmt_sec_to_TIME(&mysql_time, my_time);
#endif
  mrn::TimeConverter time_converter;
  time = time_converter.mysql_time_to_grn_time(&mysql_time, &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  memcpy(buf, &time, 8);
  *size = 8;
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_key_time(Field *field, const uchar *key,
                                        uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  long long int time;
#ifdef MRN_MARIADB_P
  MYSQL_TIME mysql_time;
  bool truncated = false;
  if (field->decimals() == 0) {
    long long int packed_time = sint3korr(key);
    mysql_time.neg = false;
    if (packed_time < 0) {
      mysql_time.neg = true;
      packed_time = -packed_time;
    }
    mysql_time.year = 0;
    mysql_time.month = 0;
    mysql_time.day = 0;
    mysql_time.hour = (int)(packed_time / 10000);
    long long int minute_part = packed_time - mysql_time.hour * 10000;
    mysql_time.minute = (int)(minute_part / 100);
    mysql_time.second = (int)(minute_part % 100);
    mysql_time.second_part = 0;
    mysql_time.time_type = MYSQL_TIMESTAMP_TIME;
  } else {
    Field_time_hires *time_hires_field = (Field_time_hires *)field;
    uchar *ptr_backup = field->ptr;
    uchar *null_ptr_backup = field->null_ptr;
    field->ptr = (uchar *)key;
    field->null_ptr = (uchar *)(key - 1);
    Temporal::Options opt(TIME_CONV_NONE, current_thd);
    time_hires_field->get_date(&mysql_time, opt);
    field->ptr = ptr_backup;
    field->null_ptr = null_ptr_backup;
  }
  mrn::TimeConverter time_converter;
  time = time_converter.mysql_time_to_grn_time(&mysql_time, &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
#else
  int mysql_time = (int)sint3korr(key);
  int sec =
    mysql_time / 10000 * 60 * 60 +
    mysql_time / 100 % 100 * 60 +
    mysql_time % 60;
  int usec = 0;
  time = GRN_TIME_PACK(sec, usec);
#endif
  memcpy(buf, &time, 8);
  *size = 8;
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_key_year(Field *field, const uchar *key,
                                        uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  int year = (int)key[0];

  struct tm datetime;
  memset(&datetime, 0, sizeof(struct tm));
  datetime.tm_year = year;
  datetime.tm_mon = 0;
  datetime.tm_mday = 1;
  int usec = 0;
  mrn::TimeConverter time_converter;
  long long int time = time_converter.tm_to_grn_time(&datetime, usec,
                                                     &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  memcpy(buf, &time, 8);
  *size = 8;
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_key_datetime(Field *field, const uchar *key,
                                            uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;
  long long int time;
#ifdef MRN_MARIADB_P
  if (field->decimals() > 0) {
    Field_datetime_hires *datetime_hires_field = (Field_datetime_hires *)field;
    MYSQL_TIME mysql_time;
    uchar *ptr_backup = field->ptr;
    uchar *null_ptr_backup = field->null_ptr;
    field->ptr = (uchar *)key;
    field->null_ptr = (uchar *)(key - 1);
    Temporal::Options opt(TIME_CONV_NONE, current_thd);
    datetime_hires_field->get_date(&mysql_time, opt);
    field->ptr = ptr_backup;
    field->null_ptr = null_ptr_backup;
    mrn::TimeConverter time_converter;
    time = time_converter.mysql_time_to_grn_time(&mysql_time, &truncated);
  } else
#endif
  {
    long long int encoded_datetime = sint8korr(key);
    uint32 part1 = (uint32)(encoded_datetime / 1000000LL);
    uint32 part2 = (uint32)(encoded_datetime -
                            (unsigned long long int)part1 * 1000000LL);
    struct tm date;
    memset(&date, 0, sizeof(struct tm));
    date.tm_year = part1 / 10000 - mrn::TimeConverter::TM_YEAR_BASE;
    date.tm_mon = part1 / 100 % 100 - 1;
    date.tm_mday = part1 % 100;
    date.tm_hour = part2 / 10000;
    date.tm_min = part2 / 100 % 100;
    date.tm_sec = part2 % 100;
    int usec = 0;
    mrn::TimeConverter time_converter;
    time = time_converter.tm_to_grn_time(&date, usec, &truncated);
  }
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  memcpy(buf, &time, 8);
  *size = 8;
  DBUG_RETURN(error);
}

#ifdef MRN_HAVE_MYSQL_TYPE_TIMESTAMP2
int ha_mroonga::storage_encode_key_timestamp2(Field *field, const uchar *key,
                                              uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;

  Field_timestampf *timestamp2_field = (Field_timestampf *)field;
  struct my_timeval tm;
  my_timestamp_from_binary(&tm, key, timestamp2_field->decimals());
  MYSQL_TIME mysql_time;
  mrn_my_tz_UTC->gmt_sec_to_TIME(&mysql_time, (my_time_t)tm.tv_sec);
  mysql_time.second_part = tm.tv_usec;
  mrn::TimeConverter time_converter;
  long long int grn_time = time_converter.mysql_time_to_grn_time(&mysql_time,
                                                                 &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  memcpy(buf, &grn_time, 8);
  *size = 8;

  DBUG_RETURN(error);
}
#endif

#ifdef MRN_HAVE_MYSQL_TYPE_DATETIME2
int ha_mroonga::storage_encode_key_datetime2(Field *field, bool is_null,
                                             const uchar *key,
                                             uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;

  Field_datetimef *datetime2_field = (Field_datetimef *)field;
  longlong packed_time = is_null ? 0 :
    my_datetime_packed_from_binary(key, datetime2_field->decimals());
  MYSQL_TIME mysql_time;
  TIME_from_longlong_datetime_packed(&mysql_time, packed_time);
  mrn::TimeConverter time_converter;
  long long int grn_time = time_converter.mysql_time_to_grn_time(&mysql_time,
                                                                 &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  memcpy(buf, &grn_time, 8);
  *size = 8;

  DBUG_RETURN(error);
}
#endif

#ifdef MRN_HAVE_MYSQL_TYPE_TIME2
int ha_mroonga::storage_encode_key_time2(Field *field, const uchar *key,
                                         uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  bool truncated = false;

  Field_timef *time2_field = (Field_timef *)field;
  longlong packed_time =
    my_time_packed_from_binary(key, time2_field->decimals());
  MYSQL_TIME mysql_time;
  TIME_from_longlong_time_packed(&mysql_time, packed_time);
  mrn::TimeConverter time_converter;
  long long int grn_time = time_converter.mysql_time_to_grn_time(&mysql_time,
                                                                 &truncated);
  if (truncated) {
    if (MRN_ABORT_ON_WARNING(ha_thd())) {
      error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
    }
    field->set_warning(MRN_SEVERITY_WARNING,
                       MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                       1);
  }
  memcpy(buf, &grn_time, 8);
  *size = 8;

  DBUG_RETURN(error);
}
#endif

int ha_mroonga::storage_encode_key_enum(Field *field, const uchar *key,
                                        uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (field->pack_length() == 1) {
    uchar value;
    value = key[0];
    *size = 1;
    memcpy(buf, &value, *size);
  } else {
    uint16 value;
    mrn::value_decoder::decode(&value, key);
    *size = 2;
    memcpy(buf, &value, *size);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_key_set(Field *field, const uchar *key,
                                       uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  Field_set unpacker((uchar *)key, field->field_length, (uchar *)(key - 1),
                     field->null_bit, field->unireg_check,
                     &field->field_name,
                     field->pack_length(),
                     static_cast<Field_set*>(field)->typelib(),
                     static_cast<Field_set*>(field)->charset());
  switch (field->pack_length()) {
  case 1:
    {
      int8 signed_value = (int8)(unpacker.val_int());
      uint8 unsigned_value = *((uint8 *)&signed_value);
      *size = 1;
      memcpy(buf, &unsigned_value, *size);
    }
    break;
  case 2:
    {
      int16 signed_value = (int16)(unpacker.val_int());
      uint16 unsigned_value = *((uint16 *)&signed_value);
      *size = 2;
      memcpy(buf, &unsigned_value, *size);
    }
    break;
  case 3:
  case 4:
    {
      int32 signed_value = (int32)(unpacker.val_int());
      uint32 unsigned_value = *((uint32 *)&signed_value);
      *size = 4;
      memcpy(buf, &unsigned_value, *size);
    }
    break;
  case 8:
  default:
    {
      int64 signed_value = (int64)(unpacker.val_int());
      uint64 unsigned_value = *((uint64 *)&signed_value);
      *size = 8;
      memcpy(buf, &unsigned_value, *size);
    }
    break;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_key(Field *field, const uchar *key,
                                   uchar *buf, uint *size)
{
  MRN_DBUG_ENTER_METHOD();
  int error;
  bool truncated = false;
  bool is_null = false;
  const uchar *ptr = key;

  error = mrn_change_encoding(ctx, field->charset());
  if (error)
    DBUG_RETURN(error);

  if (field->null_bit) {
    is_null = *ptr;
    ptr += 1;
  }

  switch (field->real_type()) {
  case MYSQL_TYPE_BIT:
  case MYSQL_TYPE_TINY:
    {
      memcpy(buf, ptr, 1);
      *size = 1;
      break;
    }
  case MYSQL_TYPE_SHORT:
    {
      memcpy(buf, ptr, 2);
      *size = 2;
      break;
    }
  case MYSQL_TYPE_INT24:
    {
      memcpy(buf, ptr, 3);
      buf[3] = 0;
      *size = 4;
      break;
    }
  case MYSQL_TYPE_LONG:
    {
      memcpy(buf, ptr, 4);
      *size = 4;
      break;
    }
  case MYSQL_TYPE_TIMESTAMP:
    error = storage_encode_key_timestamp(field, ptr, buf, size);
    break;
  case MYSQL_TYPE_LONGLONG:
    {
      memcpy(buf, ptr, 8);
      *size = 8;
      break;
    }
  case MYSQL_TYPE_FLOAT:
    {
      float float_value;
      double double_value;
      mrn::value_decoder::decode(&float_value, ptr);
      double_value = float_value;
      memcpy(buf, &double_value, 8);
      *size = 8;
      break;
    }
  case MYSQL_TYPE_DOUBLE:
    {
      double val;
      mrn::value_decoder::decode(&val, ptr);
      memcpy(buf, &val, 8);
      *size = 8;
      break;
    }
  case MYSQL_TYPE_TIME:
    error = storage_encode_key_time(field, ptr, buf, size);
    break;
  case MYSQL_TYPE_YEAR:
    error = storage_encode_key_year(field, ptr, buf, size);
    break;
  case MYSQL_TYPE_DATETIME:
    error = storage_encode_key_datetime(field, ptr, buf, size);
    break;
  case MYSQL_TYPE_NEWDATE:
    {
      uint32 encoded_date = uint3korr(ptr);
      struct tm date;
      memset(&date, 0, sizeof(struct tm));
      date.tm_year = encoded_date / (16 * 32) - mrn::TimeConverter::TM_YEAR_BASE;
      date.tm_mon = encoded_date / 32 % 16 - 1;
      date.tm_mday = encoded_date % 32;
      int usec = 0;
      mrn::TimeConverter time_converter;
      long long int time = time_converter.tm_to_grn_time(&date, usec,
                                                         &truncated);
      if (truncated) {
        if (MRN_ABORT_ON_WARNING(ha_thd())) {
          error = MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd());
        }
        field->set_warning(MRN_SEVERITY_WARNING,
                           MRN_ERROR_CODE_DATA_TRUNCATE(ha_thd()),
                           1);
      }
      memcpy(buf, &time, 8);
      *size = 8;
      break;
    }
#ifdef MRN_HAVE_MYSQL_TYPE_TIMESTAMP2
  case MYSQL_TYPE_TIMESTAMP2:
    error = storage_encode_key_timestamp2(field, ptr, buf, size);
    break;
#endif
#ifdef MRN_HAVE_MYSQL_TYPE_DATETIME2
  case MYSQL_TYPE_DATETIME2:
    error = storage_encode_key_datetime2(field, is_null, ptr, buf, size);
    break;
#endif
#ifdef MRN_HAVE_MYSQL_TYPE_TIME2
  case MYSQL_TYPE_TIME2:
    error = storage_encode_key_time2(field, ptr, buf, size);
    break;
#endif
  case MYSQL_TYPE_STRING:
    error = storage_encode_key_fixed_size_string(field, ptr, buf, size);
    break;
  case MYSQL_TYPE_VARCHAR:
  case MYSQL_TYPE_BLOB:
    error = storage_encode_key_variable_size_string(field, ptr, buf, size);
    break;
  case MYSQL_TYPE_ENUM:
    error = storage_encode_key_enum(field, ptr, buf, size);
    break;
  case MYSQL_TYPE_SET:
    error = storage_encode_key_set(field, ptr, buf, size);
    break;
  default:
    error = HA_ERR_UNSUPPORTED;
    break;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_multiple_column_key(KEY *key_info,
                                                   const uchar *key,
                                                   uint key_length,
                                                   uchar *buffer,
                                                   uint *encoded_length)
{
  MRN_DBUG_ENTER_METHOD();
  mrn::MultipleColumnKeyCodec codec(ctx, ha_thd(), key_info);
  int error = codec.encode(key, key_length, buffer, encoded_length);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_multiple_column_key_range(KEY *key_info,
                                                         const uchar *start,
                                                         uint start_size,
                                                         const uchar *end,
                                                         uint end_size,
                                                         uchar *min_buffer,
                                                         uint *min_encoded_size,
                                                         uchar *max_buffer,
                                                         uint *max_encoded_size)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  mrn::MultipleColumnKeyCodec codec(ctx, ha_thd(), key_info);
  uint encoded_key_size = codec.size();
  if (start) {
    memset(min_buffer, 0, encoded_key_size);
    error = codec.encode(start, start_size,
                         min_buffer, min_encoded_size);
    // TODO: handle error?
    *min_encoded_size = encoded_key_size;
  }
  if (end) {
    memset(max_buffer, 0xff, encoded_key_size);
    error = codec.encode(end, end_size,
                         max_buffer, max_encoded_size);
    // TODO: handle error?
    *max_encoded_size = encoded_key_size;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_encode_multiple_column_key_range(KEY *key_info,
                                                         const key_range *start,
                                                         const key_range *end,
                                                         uchar *min_buffer,
                                                         uint *min_encoded_size,
                                                         uchar *max_buffer,
                                                         uint *max_encoded_size)
{
  MRN_DBUG_ENTER_METHOD();

  const uchar *start_data = NULL;
  uint start_size = 0;
  const uchar *end_data = NULL;
  uint end_size = 0;
  if (start) {
    start_data = start->key;
    start_size = start->length;
  }
  if (end) {
    end_data = end->key;
    end_size = end->length;
  }

  int error = storage_encode_multiple_column_key_range(key_info,
                                                       start_data, start_size,
                                                       end_data, end_size,
                                                       min_buffer,
                                                       min_encoded_size,
                                                       max_buffer,
                                                       max_encoded_size);

  DBUG_RETURN(error);
}

int ha_mroonga::generic_reset()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  if (thd_sql_command(ha_thd()) != SQLCOM_SELECT) {
    DBUG_RETURN(error);
  }

  TABLE_LIST *table_list = table->pos_in_table_list;
  if (!table_list) {
    DBUG_RETURN(error);
  }

  st_select_lex *select_lex = table_list->select_lex;
  if (!select_lex) {
    DBUG_RETURN(error);
  }

  List_iterator<Item_func_match> iterator(*(select_lex->ftfunc_list));
  Item_func_match *item;
  while ((item = iterator++)) {
    if (item->ft_handler) {
      mrn_generic_ft_clear(item->ft_handler);
    }
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_reset()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_reset();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
#ifdef MRN_HANDLER_HAVE_CHECK_IF_SUPPORTED_INPLACE_ALTER
  if (alter_key_info_buffer) {
    my_free(alter_key_info_buffer);
    alter_key_info_buffer = NULL;
  }
#else
  if (wrap_alter_key_info) {
    my_free(wrap_alter_key_info);
    wrap_alter_key_info = NULL;
  }
#endif
  wrap_ft_init_count = 0;
  int generic_error = generic_reset();
  if (error == 0) {
    error = generic_error;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_reset()
{
  MRN_DBUG_ENTER_METHOD();
  int error;
  error = generic_reset();
  DBUG_RETURN(error);
}

int ha_mroonga::reset()
{
  int error = 0;
  THD *thd = ha_thd();
  MRN_DBUG_ENTER_METHOD();
  DBUG_PRINT("info", ("mroonga: this=%p", this));
  clear_empty_value_records();
  clear_search_result();
  clear_search_result_geo();
  if (share->wrapper_mode)
    error = wrapper_reset();
  else
    error = storage_reset();
  ignoring_no_key_columns = false;
  inserting_with_update = false;
  ignoring_duplicated_key = false;
  fulltext_searching = false;
  replacing_ = false;
  written_by_row_based_binlog = 0;
  mrn_lock_type = F_UNLCK;
  mrn_clear_slot_data(thd);
  current_ft_item = NULL;
  DBUG_RETURN(error);
}

handler *ha_mroonga::wrapper_clone(const char *name, MEM_ROOT *mem_root)
{
  handler *cloned_handler;
  MRN_DBUG_ENTER_METHOD();
  if (!(cloned_handler = get_new_handler(table->s, mem_root,
                                         table->s->db_type())))
    DBUG_RETURN(NULL);
  ((ha_mroonga *) cloned_handler)->is_clone = true;
  ((ha_mroonga *) cloned_handler)->parent_for_clone = this;
  ((ha_mroonga *) cloned_handler)->mem_root_for_clone = mem_root;
  if (cloned_handler->ha_open(table, table->s->normalized_path.str,
                              table->db_stat, HA_OPEN_IGNORE_IF_LOCKED))
  {
    delete cloned_handler;
    DBUG_RETURN(NULL);
  }
  DBUG_RETURN(cloned_handler);
}

handler *ha_mroonga::storage_clone(const char *name, MEM_ROOT *mem_root)
{
  MRN_DBUG_ENTER_METHOD();
  handler *cloned_handler;
  cloned_handler = handler::clone(name, mem_root);
  DBUG_RETURN(cloned_handler);
}

handler *ha_mroonga::clone(const char *name, MEM_ROOT *mem_root)
{
  MRN_DBUG_ENTER_METHOD();
  handler *cloned_handler;
  if (share->wrapper_mode)
  {
    cloned_handler = wrapper_clone(name, mem_root);
  } else {
    cloned_handler = storage_clone(name, mem_root);
  }
  DBUG_RETURN(cloned_handler);
}

uint8 ha_mroonga::wrapper_table_cache_type()
{
  uint8 res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->table_cache_type();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

uint8 ha_mroonga::storage_table_cache_type()
{
  MRN_DBUG_ENTER_METHOD();
  uint8 type = handler::table_cache_type();
  DBUG_RETURN(type);
}

uint8 ha_mroonga::table_cache_type()
{
  MRN_DBUG_ENTER_METHOD();
  uint8 type;
  if (share->wrapper_mode)
  {
    type = wrapper_table_cache_type();
  } else {
    type = storage_table_cache_type();
  }
  DBUG_RETURN(type);
}

#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ
ha_rows ha_mroonga::wrapper_multi_range_read_info_const(uint keyno,
                                                        RANGE_SEQ_IF *seq,
                                                        void *seq_init_param,
                                                        uint n_ranges,
                                                        uint *bufsz,
                                                        uint *flags,
                                                        ha_rows limit,
                                                        Cost_estimate *cost)
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows rows;
  KEY *key_info = &(table->key_info[keyno]);
  if (mrn_is_geo_key(key_info)) {
    rows = handler::multi_range_read_info_const(keyno, seq, seq_init_param,
                                                n_ranges, bufsz, flags, limit,
                                                cost);
    DBUG_RETURN(rows);
  }
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
  rows = wrap_handler->multi_range_read_info_const(keyno, seq, seq_init_param,
                                                   n_ranges, bufsz, flags,
                                                   limit, cost);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(rows);
}

ha_rows ha_mroonga::storage_multi_range_read_info_const(uint keyno,
                                                        RANGE_SEQ_IF *seq,
                                                        void *seq_init_param,
                                                        uint n_ranges,
                                                        uint *bufsz,
                                                        uint *flags,
                                                        ha_rows limit,
                                                        Cost_estimate *cost)
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows rows = handler::multi_range_read_info_const(keyno, seq,
                                                      seq_init_param,
                                                      n_ranges, bufsz, flags,
                                                      limit, cost);
  DBUG_RETURN(rows);
}

ha_rows ha_mroonga::multi_range_read_info_const(uint keyno, RANGE_SEQ_IF *seq,
                                                void *seq_init_param,
                                                uint n_ranges, uint *bufsz,
                                                uint *flags, ha_rows limit,
                                                Cost_estimate *cost)
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows rows;
  if (share->wrapper_mode)
  {
    rows = wrapper_multi_range_read_info_const(keyno, seq, seq_init_param,
                                               n_ranges, bufsz,
                                               flags, limit, cost);
  } else {
    rows = storage_multi_range_read_info_const(keyno, seq, seq_init_param,
                                               n_ranges, bufsz,
                                               flags, limit, cost);
  }
  DBUG_RETURN(rows);
}

ha_rows ha_mroonga::wrapper_multi_range_read_info(uint keyno, uint n_ranges,
                                                  uint keys,
#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ_INFO_KEY_PARTS
                                                  uint key_parts,
#endif
                                                  uint *bufsz,
                                                  uint *flags,
                                                  Cost_estimate *cost)
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows rows;
  KEY *key_info = &(table->key_info[keyno]);
  if (mrn_is_geo_key(key_info)) {
    rows = handler::multi_range_read_info(keyno, n_ranges, keys,
#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ_INFO_KEY_PARTS
                                          key_parts,
#endif
                                          bufsz, flags, cost);
    DBUG_RETURN(rows);
  }
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
  rows = wrap_handler->multi_range_read_info(keyno, n_ranges, keys,
#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ_INFO_KEY_PARTS
                                             key_parts,
#endif
                                             bufsz, flags, cost);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(rows);
}

ha_rows ha_mroonga::storage_multi_range_read_info(uint keyno, uint n_ranges,
                                                  uint keys,
#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ_INFO_KEY_PARTS
                                                  uint key_parts,
#endif
                                                  uint *bufsz,
                                                  uint *flags,
                                                  Cost_estimate *cost)
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows rows = handler::multi_range_read_info(keyno, n_ranges, keys,
#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ_INFO_KEY_PARTS
                                                key_parts,
#endif
                                                bufsz, flags, cost);
  DBUG_RETURN(rows);
}

ha_rows ha_mroonga::multi_range_read_info(uint keyno, uint n_ranges, uint keys,
#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ_INFO_KEY_PARTS
                                          uint key_parts,
#endif
                                          uint *bufsz, uint *flags,
                                          Cost_estimate *cost)
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows rows;
  if (share->wrapper_mode)
  {
    rows = wrapper_multi_range_read_info(keyno, n_ranges, keys,
#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ_INFO_KEY_PARTS
                                         key_parts,
#endif
                                         bufsz, flags, cost);
  } else {
    rows = storage_multi_range_read_info(keyno, n_ranges, keys,
#ifdef MRN_HANDLER_HAVE_MULTI_RANGE_READ_INFO_KEY_PARTS
                                         key_parts,
#endif
                                         bufsz, flags, cost);
  }
  DBUG_RETURN(rows);
}

int ha_mroonga::wrapper_multi_range_read_init(RANGE_SEQ_IF *seq,
                                              void *seq_init_param,
                                              uint n_ranges, uint mode,
                                              HANDLER_BUFFER *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  KEY *key_info = &(table->key_info[active_index]);
  if (mrn_is_geo_key(key_info)) {
    error = handler::multi_range_read_init(seq, seq_init_param,
                                           n_ranges, mode, buf);
    DBUG_RETURN(error);
  }
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
  error = wrap_handler->multi_range_read_init(seq, seq_init_param,
                                              n_ranges, mode, buf);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_multi_range_read_init(RANGE_SEQ_IF *seq,
                                              void *seq_init_param,
                                              uint n_ranges, uint mode,
                                              HANDLER_BUFFER *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = handler::multi_range_read_init(seq, seq_init_param,
                                             n_ranges, mode, buf);
  DBUG_RETURN(error);
}

int ha_mroonga::multi_range_read_init(RANGE_SEQ_IF *seq, void *seq_init_param,
                                      uint n_ranges, uint mode,
                                      HANDLER_BUFFER *buf)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_multi_range_read_init(seq, seq_init_param,
                                          n_ranges, mode, buf);
  } else {
    error = storage_multi_range_read_init(seq, seq_init_param,
                                          n_ranges, mode, buf);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_multi_range_read_next(range_id_t *range_info)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  KEY *key_info = &(table->key_info[active_index]);
  if (mrn_is_geo_key(key_info)) {
    error = handler::multi_range_read_next(range_info);
    DBUG_RETURN(error);
  }
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
  error = wrap_handler->multi_range_read_next(range_info);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_multi_range_read_next(range_id_t *range_info)
{
  MRN_DBUG_ENTER_METHOD();
  int error = handler::multi_range_read_next(range_info);
  DBUG_RETURN(error);
}

int ha_mroonga::multi_range_read_next(range_id_t *range_info)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_multi_range_read_next(range_info);
  } else {
    error = storage_multi_range_read_next(range_info);
  }
  DBUG_RETURN(error);
}
#else // MRN_HANDLER_HAVE_MULTI_RANGE_READ
int ha_mroonga::wrapper_read_multi_range_first(KEY_MULTI_RANGE **found_range_p,
                                               KEY_MULTI_RANGE *ranges,
                                               uint range_count,
                                               bool sorted,
                                               HANDLER_BUFFER *buffer)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  KEY *key_info = &(table->key_info[active_index]);
  if (mrn_is_geo_key(key_info)) {
    error = handler::read_multi_range_first(found_range_p, ranges,
                                            range_count, sorted, buffer);
    DBUG_RETURN(error);
  }
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
  error = wrap_handler->read_multi_range_first(found_range_p, ranges,
                                                  range_count, sorted, buffer);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_read_multi_range_first(KEY_MULTI_RANGE **found_range_p,
                                               KEY_MULTI_RANGE *ranges,
                                               uint range_count,
                                               bool sorted,
                                               HANDLER_BUFFER *buffer)
{
  MRN_DBUG_ENTER_METHOD();
  int error = handler::read_multi_range_first(found_range_p, ranges,
                                              range_count, sorted, buffer);
  DBUG_RETURN(error);
}

int ha_mroonga::read_multi_range_first(KEY_MULTI_RANGE **found_range_p,
                                       KEY_MULTI_RANGE *ranges,
                                       uint range_count,
                                       bool sorted,
                                       HANDLER_BUFFER *buffer)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_read_multi_range_first(found_range_p, ranges,
                                           range_count, sorted, buffer);
  } else {
    error = storage_read_multi_range_first(found_range_p, ranges,
                                           range_count, sorted, buffer);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_read_multi_range_next(KEY_MULTI_RANGE **found_range_p)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  KEY *key_info = &(table->key_info[active_index]);
  if (mrn_is_geo_key(key_info)) {
    error = handler::read_multi_range_next(found_range_p);
    DBUG_RETURN(error);
  }
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (fulltext_searching)
    set_pk_bitmap();
  error = wrap_handler->read_multi_range_next(found_range_p);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_read_multi_range_next(KEY_MULTI_RANGE **found_range_p)
{
  MRN_DBUG_ENTER_METHOD();
  int error = handler::read_multi_range_next(found_range_p);
  DBUG_RETURN(error);
}

int ha_mroonga::read_multi_range_next(KEY_MULTI_RANGE **found_range_p)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_read_multi_range_next(found_range_p);
  } else {
    error = storage_read_multi_range_next(found_range_p);
  }
  DBUG_RETURN(error);
}
#endif // MRN_HANDLER_HAVE_MULTI_RANGE_READ

#ifdef MRN_HANDLER_START_BULK_INSERT_HAS_FLAGS
void ha_mroonga::wrapper_start_bulk_insert(ha_rows rows, uint flags)
#else
void ha_mroonga::wrapper_start_bulk_insert(ha_rows rows)
#endif
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
#ifdef MRN_HANDLER_START_BULK_INSERT_HAS_FLAGS
  wrap_handler->ha_start_bulk_insert(rows, flags);
#else
  wrap_handler->ha_start_bulk_insert(rows);
#endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

#ifdef MRN_HANDLER_START_BULK_INSERT_HAS_FLAGS
void ha_mroonga::storage_start_bulk_insert(ha_rows rows, uint flags)
#else
void ha_mroonga::storage_start_bulk_insert(ha_rows rows)
#endif
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_VOID_RETURN;
}

#ifdef MRN_HANDLER_START_BULK_INSERT_HAS_FLAGS
void ha_mroonga::start_bulk_insert(ha_rows rows, uint flags)
#else
void ha_mroonga::start_bulk_insert(ha_rows rows)
#endif
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode) {
#ifdef MRN_HANDLER_START_BULK_INSERT_HAS_FLAGS
    wrapper_start_bulk_insert(rows, flags);
#else
    wrapper_start_bulk_insert(rows);
#endif
  } else {
#ifdef MRN_HANDLER_START_BULK_INSERT_HAS_FLAGS
    storage_start_bulk_insert(rows, flags);
#else
    storage_start_bulk_insert(rows);
#endif
  }
  DBUG_VOID_RETURN;
}

int ha_mroonga::wrapper_end_bulk_insert()
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_end_bulk_insert();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_end_bulk_insert()
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(0);
}

int ha_mroonga::end_bulk_insert()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_end_bulk_insert();
  } else {
    error = storage_end_bulk_insert();
  }
  DBUG_RETURN(error);
}

int ha_mroonga::generic_delete_all_rows(grn_obj *target_grn_table,
                                        const char *function_name)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  if (is_dry_write()) {
    DBUG_PRINT("info",
               ("mroonga: dry write: %s::%s", MRN_CLASS_NAME, function_name));
    DBUG_RETURN(error);
  }

  grn_table_cursor *cursor;
  cursor = grn_table_cursor_open(ctx, target_grn_table,
                                 NULL, 0,
                                 NULL, 0,
                                 0, -1,
                                 0);
  if (cursor) {
    while (grn_table_cursor_next(ctx, cursor) != GRN_ID_NIL) {
      grn_table_cursor_delete(ctx, cursor);
    }
    grn_table_cursor_close(ctx, cursor);
  } else {
    error = ER_ERROR_ON_WRITE;
    my_message(error, ctx->errbuf, MYF(0));
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_delete_all_rows()
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_delete_all_rows();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);

  if (error) {
    DBUG_RETURN(error);
  }

  if (!wrapper_have_target_index()) {
    DBUG_RETURN(error);
  }

  uint i;
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    KEY *key_info = &(table->key_info[i]);

    if (!(wrapper_is_target_index(key_info))) {
      continue;
    }

    if (!grn_index_tables[i]) {
      /* disable keys */
      continue;
    }

    error = generic_delete_all_rows(grn_index_tables[i], __FUNCTION__);
    if (error) {
      break;
    }
  }

  int grn_table_error;
  grn_table_error = generic_delete_all_rows(grn_table, __FUNCTION__);
  if (!error) {
    error = grn_table_error;
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_delete_all_rows()
{
  MRN_DBUG_ENTER_METHOD();
  int error = generic_delete_all_rows(grn_table, __FUNCTION__);
  if (!error) {
    uint n_keys = table->s->keys;
    for (uint i = 0; i < n_keys; i++) {
      if (i == table->s->primary_key) {
        continue;
      }

      KEY *key_info = &(table->key_info[i]);
      if (!(key_info->flags & HA_NOSAME)) {
        continue;
      }

      grn_obj *index_table = grn_index_tables[i];
      if (!index_table) {
        continue;
      }

      error = generic_delete_all_rows(index_table, __FUNCTION__);
      if (error) {
        break;
      }
    }
  }
  DBUG_RETURN(error);
}

int ha_mroonga::delete_all_rows()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_delete_all_rows();
  } else {
    error = storage_delete_all_rows();
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_truncate()
{
  int error = 0;
  MRN_SHARE *tmp_share;
  MRN_DBUG_ENTER_METHOD();

  if (!(tmp_share = mrn_get_share(table->s->table_name.str, table, &error)))
    DBUG_RETURN(error);

  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  if (parse_engine_table_options(ha_thd(), tmp_share->hton, table->s))
    error= MRN_GET_ERROR_NUMBER;
  else
  {
    wrap_handler->option_struct= option_struct= table->s->option_struct_table;
    error = wrap_handler->ha_truncate();
  }
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);

  mrn_free_share(tmp_share);

  if (!error && wrapper_have_target_index()) {
    error = wrapper_truncate_index();
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_truncate_index()
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  if (is_dry_write()) {
    DBUG_PRINT("info",
               ("mroonga: dry write: %s::%s", MRN_CLASS_NAME, __FUNCTION__));
    DBUG_RETURN(error);
  }

  grn_rc rc;
  uint i;
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    KEY *key_info = &(table->key_info[i]);

    if (!(wrapper_is_target_index(key_info))) {
      continue;
    }

    if (!grn_index_tables[i]) {
      /* disable keys */
      continue;
    }

    rc = grn_table_truncate(ctx, grn_index_tables[i]);
    if (rc) {
      error = ER_ERROR_ON_WRITE;
      my_message(error, ctx->errbuf, MYF(0));
      goto err;
    }
  }
err:
  rc = grn_table_truncate(ctx, grn_table);
  if (rc) {
    error = ER_ERROR_ON_WRITE;
    my_message(error, ctx->errbuf, MYF(0));
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_truncate()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  if (is_dry_write()) {
    DBUG_PRINT("info", ("mroonga: dry write: ha_mroonga::%s", __FUNCTION__));
    DBUG_RETURN(error);
  }

  grn_rc rc;
  rc = grn_table_truncate(ctx, grn_table);
  if (rc) {
    my_message(ER_ERROR_ON_WRITE, ctx->errbuf, MYF(0));
    DBUG_RETURN(ER_ERROR_ON_WRITE);
  }
  error = storage_truncate_index();

  if (!error && thd_sql_command(ha_thd()) == SQLCOM_TRUNCATE) {
    MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
    mrn::Lock lock(&long_term_share->auto_inc_mutex);
    long_term_share->auto_inc_value = 0;
    DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
      long_term_share->auto_inc_value));
    long_term_share->auto_inc_inited = false;
  }

  DBUG_RETURN(error);
}

int ha_mroonga::storage_truncate_index()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;

  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  grn_rc rc;
  uint i;
  uint n_keys = table->s->keys;
  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }

    KEY *key_info = &(table->key_info[i]);

    if (
      !(key_info->flags & HA_NOSAME) &&
      (KEY_N_KEY_PARTS(key_info) == 1 || key_info->algorithm == HA_KEY_ALG_FULLTEXT)
    ) {
      continue;
    }

    if (!grn_index_tables[i]) {
      /* disable keys */
      continue;
    }

    rc = grn_table_truncate(ctx, grn_index_tables[i]);
    if (rc) {
      error = ER_ERROR_ON_WRITE;
      my_message(error, ctx->errbuf, MYF(0));
      goto err;
    }
  }
err:
  DBUG_RETURN(error);
}

int ha_mroonga::truncate()
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_truncate();
  } else {
    error = storage_truncate();
  }
  if (!error) {
    operations_->clear(table->s->table_name.str,
                       table->s->table_name.length);
  }
  DBUG_RETURN(error);
}

IO_AND_CPU_COST ha_mroonga::wrapper_scan_time()
{
  IO_AND_CPU_COST res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->scan_time();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

IO_AND_CPU_COST ha_mroonga::storage_scan_time()
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(handler::scan_time());
}

IO_AND_CPU_COST ha_mroonga::scan_time()
{
  MRN_DBUG_ENTER_METHOD();
  IO_AND_CPU_COST time;
  if (share->wrapper_mode)
  {
    time = wrapper_scan_time();
  } else {
    time = storage_scan_time();
  }
  DBUG_RETURN(time);
}

IO_AND_CPU_COST ha_mroonga::wrapper_rnd_pos_time(ha_rows rows)
{
  IO_AND_CPU_COST res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->rnd_pos_time(rows);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

IO_AND_CPU_COST ha_mroonga::storage_rnd_pos_time(ha_rows rows)
{
  MRN_DBUG_ENTER_METHOD();
  IO_AND_CPU_COST time = handler::rnd_pos_time(rows);
  DBUG_RETURN(time);
}


IO_AND_CPU_COST ha_mroonga::rnd_pos_time(ha_rows rows)
{
  MRN_DBUG_ENTER_METHOD();
  IO_AND_CPU_COST time;
  if (share->wrapper_mode)
  {
    time = wrapper_rnd_pos_time(rows);
  } else {
    time = storage_rnd_pos_time(rows);
  }
  DBUG_RETURN(time);
}


IO_AND_CPU_COST ha_mroonga::wrapper_keyread_time(uint index, ulong ranges,
                                                 ha_rows rows, ulonglong blocks)
{
  IO_AND_CPU_COST res;
  MRN_DBUG_ENTER_METHOD();
  if (index < MAX_KEY) {
    KEY *key_info = &(table->key_info[index]);
    if (mrn_is_geo_key(key_info)) {
      res = handler::keyread_time(index, ranges, rows, blocks);
      DBUG_RETURN(res);
    }
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    res = wrap_handler->keyread_time(share->wrap_key_nr[index], ranges, rows, blocks);
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  } else {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    res = wrap_handler->keyread_time(index, ranges, rows, blocks);
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  DBUG_RETURN(res);
}

IO_AND_CPU_COST ha_mroonga::storage_keyread_time(uint index, ulong ranges, ha_rows rows, ulonglong blocks)
{
  MRN_DBUG_ENTER_METHOD();
  IO_AND_CPU_COST time = handler::keyread_time(index, ranges, rows, blocks);
  DBUG_RETURN(time);
}

IO_AND_CPU_COST ha_mroonga::keyread_time(uint index, ulong ranges, ha_rows rows, ulonglong blocks)
{
  MRN_DBUG_ENTER_METHOD();
  IO_AND_CPU_COST time;
  if (share->wrapper_mode)
  {
    time = wrapper_keyread_time(index, ranges, rows, blocks);
  } else {
    time = storage_keyread_time(index, ranges, rows, blocks);
  }
  DBUG_RETURN(time);
}


#ifdef MRN_HANDLER_HAVE_KEYS_TO_USE_FOR_SCANNING
const key_map *ha_mroonga::wrapper_keys_to_use_for_scanning()
{
  const key_map *res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->keys_to_use_for_scanning();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

const key_map *ha_mroonga::storage_keys_to_use_for_scanning()
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(&key_map_full);
}

const key_map *ha_mroonga::keys_to_use_for_scanning()
{
  MRN_DBUG_ENTER_METHOD();
  const key_map *key_map;
  if (share->wrapper_mode)
  {
    key_map = wrapper_keys_to_use_for_scanning();
  } else {
    key_map = storage_keys_to_use_for_scanning();
  }
  DBUG_RETURN(key_map);
}
#endif

ha_rows ha_mroonga::wrapper_estimate_rows_upper_bound()
{
  ha_rows res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->estimate_rows_upper_bound();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

ha_rows ha_mroonga::storage_estimate_rows_upper_bound()
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows rows = handler::estimate_rows_upper_bound();
  DBUG_RETURN(rows);
}

ha_rows ha_mroonga::estimate_rows_upper_bound()
{
  MRN_DBUG_ENTER_METHOD();
  ha_rows rows;
  if (share->wrapper_mode)
  {
    rows = wrapper_estimate_rows_upper_bound();
  } else {
    rows = storage_estimate_rows_upper_bound();
  }
  DBUG_RETURN(rows);
}

void ha_mroonga::wrapper_update_create_info(HA_CREATE_INFO* create_info)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->update_create_info(create_info);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_update_create_info(HA_CREATE_INFO* create_info)
{
  MRN_DBUG_ENTER_METHOD();
  handler::update_create_info(create_info);
  if (!(create_info->used_fields & HA_CREATE_USED_AUTO)) {
    MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
    if (!long_term_share->auto_inc_inited) {
      storage_info(HA_STATUS_AUTO);
    }
    create_info->auto_increment_value = long_term_share->auto_inc_value;
    DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
      long_term_share->auto_inc_value));
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::update_create_info(HA_CREATE_INFO* create_info)
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
    wrapper_update_create_info(create_info);
  else
    storage_update_create_info(create_info);
  st_mrn_slot_data *slot_data = mrn_get_slot_data(ha_thd(), true);
  if (slot_data) {
    slot_data->alter_create_info = create_info;
    if (slot_data->alter_comment) {
      my_free(slot_data->alter_comment);
      slot_data->alter_comment = NULL;
    }
    if (create_info->comment.str) {
      slot_data->alter_comment =
        mrn_my_strndup(create_info->comment.str,
                       create_info->comment.length,
                       MYF(MY_WME));
    }
    if (share && share->disable_keys) {
      slot_data->disable_keys_create_info = create_info;
    }
  }
  DBUG_VOID_RETURN;
}

int ha_mroonga::wrapper_rename_table(const char *from, const char *to,
                                     MRN_SHARE *tmp_share,
                                     const char *from_table_name,
                                     const char *to_table_name)
{
  int error = 0;
  handler *hnd;
  MRN_DBUG_ENTER_METHOD();

  hnd = get_new_handler(tmp_share->table_share,
                        current_thd->mem_root,
                        tmp_share->hton);
  if (!hnd)
  {
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
  }

  if ((error = hnd->ha_rename_table(from, to)))
  {
    delete hnd;
    DBUG_RETURN(error);
  }

  error = wrapper_rename_index(from, to, tmp_share,
                               from_table_name, to_table_name);

  delete hnd;
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_rename_index(const char *from, const char *to,
                                     MRN_SHARE *tmp_share,
                                     const char *from_table_name,
                                     const char *to_table_name)
{
  int error;
  grn_rc rc;
  MRN_DBUG_ENTER_METHOD();
  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  error = ensure_database_open(from);
  if (error)
    DBUG_RETURN(error);

  TABLE_SHARE *tmp_table_share = tmp_share->table_share;

  uint i;
  for (i = 0; i < tmp_table_share->keys; i++) {
    const char *mysql_index_name = tmp_table_share->key_info[i].name.str;
    mrn::IndexTableName from_index_table_name(from_table_name, mysql_index_name);
    mrn::IndexTableName to_index_table_name(to_table_name, mysql_index_name);
    grn_obj *index_table;
    index_table = grn_ctx_get(ctx,
                              from_index_table_name.c_str(),
                              from_index_table_name.length());
    if (!index_table) {
      index_table = grn_ctx_get(ctx,
                                from_index_table_name.old_c_str(),
                                from_index_table_name.old_length());
    }
    if (index_table) {
      rc = grn_table_rename(ctx, index_table,
                            to_index_table_name.c_str(),
                            to_index_table_name.length());
      if (rc != GRN_SUCCESS) {
        error = ER_CANT_OPEN_FILE;
        my_message(error, ctx->errbuf, MYF(0));
        DBUG_RETURN(error);
      }
    }
  }

  grn_obj *table = grn_ctx_get(ctx, from_table_name, strlen(from_table_name));
  if (ctx->rc != GRN_SUCCESS) {
    error = ER_CANT_OPEN_FILE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  rc = grn_table_rename(ctx, table, to_table_name,
                        strlen(to_table_name));
  if (rc != GRN_SUCCESS) {
    error = ER_CANT_OPEN_FILE;
    my_message(error, ctx->errbuf, MYF(0));
    DBUG_RETURN(error);
  }
  DBUG_RETURN(0);
}

int ha_mroonga::storage_rename_table(const char *from, const char *to,
                                     MRN_SHARE *tmp_share,
                                     const char *from_table_name,
                                     const char *to_table_name)
{
  int error;
  grn_rc rc;
  TABLE_SHARE *tmp_table_share = tmp_share->table_share;
  MRN_LONG_TERM_SHARE *from_long_term_share = tmp_share->long_term_share,
                      *to_long_term_share;
  MRN_DBUG_ENTER_METHOD();
  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  error = ensure_database_open(from);
  if (error)
    DBUG_RETURN(error);

  if (!(to_long_term_share = mrn_get_long_term_share(to, strlen(to), &error)))
    DBUG_RETURN(error);
  to_long_term_share->auto_inc_value = from_long_term_share->auto_inc_value;
  DBUG_PRINT("info", ("mroonga: to_auto_inc_value=%llu",
    to_long_term_share->auto_inc_value));
  to_long_term_share->auto_inc_inited = from_long_term_share->auto_inc_inited;

  uint i;
  for (i = 0; i < tmp_table_share->keys; i++) {
    const char *mysql_index_name = tmp_table_share->key_info[i].name.str;
    mrn::IndexTableName from_index_table_name(from_table_name,
                                              mysql_index_name);
    mrn::IndexTableName to_index_table_name(to_table_name,
                                            mysql_index_name);
    grn_obj *index_table;
    index_table = grn_ctx_get(ctx,
                              from_index_table_name.c_str(),
                              from_index_table_name.length());
    if (!index_table) {
      index_table = grn_ctx_get(ctx,
                                from_index_table_name.old_c_str(),
                                from_index_table_name.old_length());
    }
    if (index_table) {
      rc = grn_table_rename(ctx, index_table,
                            to_index_table_name.c_str(),
                            to_index_table_name.length());
      if (rc != GRN_SUCCESS) {
        error = ER_CANT_OPEN_FILE;
        my_message(error, ctx->errbuf, MYF(0));
        goto error_end;
      }
    }
  }
#ifdef MRN_SUPPORT_FOREIGN_KEYS
  error = storage_rename_foreign_key(tmp_share, from_table_name, to_table_name);
  if (error) {
    goto error_end;
  }
#endif
  {
    grn_obj *table_obj = grn_ctx_get(ctx, from_table_name, strlen(from_table_name));
    if (ctx->rc != GRN_SUCCESS) {
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      goto error_end;
    }
    rc = grn_table_rename(ctx, table_obj, to_table_name,
                          strlen(to_table_name));
    if (rc != GRN_SUCCESS) {
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      goto error_end;
    }
  }
  DBUG_RETURN(0);

error_end:
  mrn_free_long_term_share(to_long_term_share);
  DBUG_RETURN(error);
}

#ifdef MRN_SUPPORT_FOREIGN_KEYS
int ha_mroonga::storage_rename_foreign_key(MRN_SHARE *tmp_share,
                                           const char *from_table_name,
                                           const char *to_table_name)
{
  int error;
  uint i;
  grn_obj *column, *ref_column;
  grn_rc rc;
  TABLE_SHARE *tmp_table_share = tmp_share->table_share;
  uint n_columns = tmp_table_share->fields;
  MRN_DBUG_ENTER_METHOD();
  for (i = 0; i < n_columns; ++i) {
    Field *field = tmp_table_share->field[i];

    if (!is_foreign_key_field(from_table_name, field->field_name.str)) {
      continue;
    }

    grn_obj *grn_from_table = grn_ctx_get(ctx, from_table_name, -1);
    mrn::ColumnName column_name(field->field_name);
    column = grn_obj_column(ctx,
                            grn_from_table,
                            column_name.c_str(),
                            column_name.length());
    if (!column) {
      continue;
    }
    grn_id ref_table_id = grn_obj_get_range(ctx, column);
    grn_obj *ref_table = grn_ctx_at(ctx, ref_table_id);
    mrn::IndexColumnName from_index_column_name(from_table_name,
                                                column_name.c_str());
    ref_column = grn_obj_column(ctx, ref_table,
                                from_index_column_name.c_str(),
                                from_index_column_name.length());
    if (!ref_column) {
      continue;
    }
    mrn::IndexColumnName to_index_column_name(to_table_name,
                                              column_name.c_str());
    rc = grn_column_rename(ctx, ref_column,
                           to_index_column_name.c_str(),
                           to_index_column_name.length());
    if (rc != GRN_SUCCESS) {
      error = ER_CANT_OPEN_FILE;
      my_message(error, ctx->errbuf, MYF(0));
      DBUG_RETURN(error);
    }
  }
  DBUG_RETURN(0);
}
#endif

int ha_mroonga::rename_table(const char *from, const char *to)
{
  int error = 0;
  TABLE_LIST table_list;
  TABLE_SHARE *tmp_table_share;
  TABLE tmp_table;
  MRN_SHARE *tmp_share;
  MRN_DBUG_ENTER_METHOD();
  mrn::PathMapper to_mapper(to);
  mrn::PathMapper from_mapper(from);
  if (strcmp(from_mapper.db_name(), to_mapper.db_name()))
    DBUG_RETURN(HA_ERR_WRONG_COMMAND);

  LEX_CSTRING db_name=    { from_mapper.db_name(), strlen(from_mapper.db_name()) };
  LEX_CSTRING table_name= { from_mapper.mysql_table_name(),
                            strlen(from_mapper.mysql_table_name()) };
  table_list.init_one_table(&db_name, &table_name, 0,TL_WRITE);
  mrn_open_mutex_lock(NULL);
  tmp_table_share = mrn_create_tmp_table_share(&table_list, from, &error);
  mrn_open_mutex_unlock(NULL);
  if (!tmp_table_share) {
    DBUG_RETURN(error);
  }
  tmp_table.s = tmp_table_share;
#ifdef WITH_PARTITION_STORAGE_ENGINE
  tmp_table.part_info = NULL;
#endif
  if (!(tmp_share = mrn_get_share(from, &tmp_table, &error)))
  {
    mrn_open_mutex_lock(NULL);
    mrn_free_tmp_table_share(tmp_table_share);
    mrn_open_mutex_unlock(NULL);
    DBUG_RETURN(error);
  }

  if (tmp_share->wrapper_mode)
  {
    error = wrapper_rename_table(from, to, tmp_share,
                                 from_mapper.table_name(),
                                 to_mapper.table_name());
  } else {
    error = storage_rename_table(from, to, tmp_share,
                                 from_mapper.table_name(),
                                 to_mapper.table_name());
  }

  if (!error && to_mapper.table_name()[0] == '#') {
    error = add_wrap_hton(to, tmp_share->hton);
  } else if (error && from_mapper.table_name()[0] == '#') {
    add_wrap_hton(from, tmp_share->hton);
  }
  if (!error) {
    mrn_free_long_term_share(tmp_share->long_term_share);
    tmp_share->long_term_share = NULL;
  }
  mrn_free_share(tmp_share);
  mrn_open_mutex_lock(NULL);
  mrn_free_tmp_table_share(tmp_table_share);
  mrn_open_mutex_unlock(NULL);

  DBUG_RETURN(error);
}

bool ha_mroonga::wrapper_is_crashed() const
{
  bool res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->is_crashed();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

bool ha_mroonga::storage_is_crashed() const
{
  MRN_DBUG_ENTER_METHOD();
  mrn::DatabaseRepairer repairer(ctx, ha_thd());
  bool crashed = repairer.is_crashed();
  DBUG_RETURN(crashed);
}

bool ha_mroonga::is_crashed() const
{
  MRN_DBUG_ENTER_METHOD();
  bool crashed;
  if (share->wrapper_mode)
  {
    crashed = wrapper_is_crashed();
  } else {
    crashed = storage_is_crashed();
  }
  DBUG_RETURN(crashed);
}

bool ha_mroonga::wrapper_auto_repair(int error) const
{
  bool repaired;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
#ifdef MRN_HANDLER_AUTO_REPAIR_HAVE_ERROR
  repaired = wrap_handler->auto_repair(error);
#else
  repaired = wrap_handler->auto_repair();
#endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(repaired);
}

bool ha_mroonga::storage_auto_repair(int error) const
{
  MRN_DBUG_ENTER_METHOD();
  bool repaired;
#ifdef MRN_HANDLER_AUTO_REPAIR_HAVE_ERROR
  repaired = handler::auto_repair(error);
#else
  repaired = handler::auto_repair();
#endif
  DBUG_RETURN(repaired);
}

bool ha_mroonga::auto_repair(int error) const
{
  MRN_DBUG_ENTER_METHOD();
  bool repaired;
  // TODO: We should consider about creating share for error =
  // ER_CANT_OPEN_FILE. The following code just ignores the error.
  if (share && share->wrapper_mode)
  {
    repaired = wrapper_auto_repair(error);
  } else {
    repaired = storage_auto_repair(error);
  }
  DBUG_RETURN(repaired);
}

bool ha_mroonga::auto_repair() const
{
  MRN_DBUG_ENTER_METHOD();
  bool repaired = auto_repair(HA_ERR_CRASHED_ON_USAGE);
  DBUG_RETURN(repaired);
}

int ha_mroonga::generic_disable_index(int i, KEY *key_info)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;
  if (share->index_table[i]) {
    char index_column_name[GRN_TABLE_MAX_KEY_SIZE];
    snprintf(index_column_name, GRN_TABLE_MAX_KEY_SIZE - 1,
             "%s.%s", share->index_table[i], key_info[i].name.str);
    grn_obj *index_column = grn_ctx_get(ctx,
                                        index_column_name,
                                        strlen(index_column_name));
    if (index_column) {
      grn_obj_remove(ctx, index_column);
    }
  } else {
    mrn::PathMapper mapper(share->table_name);
    mrn::IndexTableName index_table_name(mapper.table_name(),
                                         key_info[i].name.str);
    grn_obj *index_table = grn_ctx_get(ctx,
                                       index_table_name.c_str(),
                                       index_table_name.length());
    if (!index_table) {
      index_table = grn_ctx_get(ctx,
                                index_table_name.old_c_str(),
                                index_table_name.old_length());
    }
    if (index_table) {
      grn_obj_remove(ctx, index_table);
    }
  }
  if (ctx->rc == GRN_SUCCESS) {
    grn_index_tables[i] = NULL;
    grn_index_columns[i] = NULL;
  } else {
    // TODO: Implement ctx->rc to error converter and use it.
    error = ER_ERROR_ON_WRITE;
    my_message(error, ctx->errbuf, MYF(0));
  }

  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_disable_indexes_mroonga(key_map map, bool persist)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  uint i;
  for (i = 0; i < table_share->keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }
    if (share->wrap_key_nr[i] < MAX_KEY) {
      continue;
    }
    if (!grn_index_tables[i]) {
      DBUG_PRINT("info", ("mroonga: keys are disabled already %u", i));
      DBUG_RETURN(0);
    }
  }
  KEY *key_info = table_share->key_info;
  for (i = 0; i < table_share->keys; i++) {
    if (key_info[i].algorithm != HA_KEY_ALG_FULLTEXT &&
        !mrn_is_geo_key(&key_info[i])) {
      continue;
    }

    int sub_error = generic_disable_index(i, key_info);
    if (error != 0 && sub_error != 0) {
      error = sub_error;
    }
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_disable_indexes(key_map map, bool persist)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_disable_indexes(map, persist);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  if (error == HA_ERR_WRONG_COMMAND) {
    error = 0;
  }
  if (!error) {
    error = wrapper_disable_indexes_mroonga(map, persist);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_disable_indexes(key_map map, bool persist)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  uint i;
  for (i = 0; i < table_share->keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }
    if (!grn_index_tables[i]) {
      DBUG_PRINT("info", ("mroonga: keys are disabled already %u", i));
      DBUG_RETURN(0);
    }
  }
  KEY *key_info = table_share->key_info;
  for (i = 0; i < table_share->keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }
    if (map.is_set(i)) {
      continue;
    }

    int sub_error = generic_disable_index(i, key_info);
    if (error != 0 && sub_error != 0) {
      error = sub_error;
    }
  }
  DBUG_RETURN(error);
}

int ha_mroonga::disable_indexes(key_map map, bool persist)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    error = wrapper_disable_indexes(map, persist);
  } else {
    error = storage_disable_indexes(map, persist);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_enable_indexes_mroonga(key_map map, bool persist)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  uint i, j;
  for (i = 0; i < table_share->keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }
    if (share->wrap_key_nr[i] < MAX_KEY) {
      continue;
    }
    if (!grn_index_columns[i]) {
      break;
    }
  }
  if (i == table_share->keys) {
    DBUG_PRINT("info", ("mroonga: keys are enabled already"));
    DBUG_RETURN(0);
  }
  KEY *p_key_info = &table->key_info[table_share->primary_key];
  KEY *key_info = table_share->key_info;
  uint n_keys = table_share->keys;
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_tables, n_keys);
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_columns, n_keys);
  bitmap_clear_all(table->read_set);
  mrn_set_bitmap_by_key(table->read_set, p_key_info);
  mrn::PathMapper mapper(share->table_name);
  for (i = 0, j = 0; i < n_keys; i++) {
    if (key_info[i].algorithm != HA_KEY_ALG_FULLTEXT &&
      !mrn_is_geo_key(&key_info[i])) {
      j++;
      continue;
    }

    if ((error = mrn_add_index_param(share, &key_info[i], i)))
    {
      break;
    }
    index_tables[i] = NULL;
    index_columns[i] = NULL;
    if (!grn_index_columns[i]) {
      if (
        (key_info[i].algorithm == HA_KEY_ALG_FULLTEXT) &&
        (error = wrapper_create_index_fulltext(mapper.table_name(),
                                               i, &key_info[i],
                                               index_tables, index_columns,
                                               share))
      ) {
        break;
      } else if (
        mrn_is_geo_key(&key_info[i]) &&
        (error = wrapper_create_index_geo(mapper.table_name(),
                                          i, &key_info[i],
                                          index_tables, index_columns,
                                          share))
      ) {
        break;
      }
      grn_index_columns[i] = index_columns[i];
    }
    mrn_set_bitmap_by_key(table->read_set, &key_info[i]);
  }
  if (!error && i > j)
  {
    error = wrapper_fill_indexes(ha_thd(), table->key_info, index_columns,
                                 n_keys);
  }
  bitmap_set_all(table->read_set);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_enable_indexes(key_map map, bool persist)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();

  int mroonga_error = wrapper_enable_indexes_mroonga(map, persist);

  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_enable_indexes(map, persist);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  if (error == HA_ERR_WRONG_COMMAND) {
    error = mroonga_error;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_enable_indexes(key_map map, bool persist)
{
  int error = 0;
  uint n_keys = table_share->keys;
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_tables, n_keys);
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_columns, n_keys);
  bool have_multiple_column_index = false;
  MRN_DBUG_ENTER_METHOD();
  uint i;
  for (i = 0; i < n_keys; i++) {
    if (i == table->s->primary_key) {
      continue;
    }
    if (!grn_index_columns[i]) {
      break;
    }
  }
  if (i == n_keys) {
    DBUG_PRINT("info", ("mroonga: keys are enabled already"));
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
    DBUG_RETURN(0);
  }
  KEY *key_info = table->key_info;
  bitmap_clear_all(table->read_set);
  mrn::PathMapper mapper(share->table_name);
  for (; i < n_keys; i++) {
    if (!map.is_set(i)) {
      continue;
    }

    if ((error = mrn_add_index_param(share, &key_info[i], i)))
    {
      break;
    }
    index_tables[i] = NULL;
    if (!grn_index_columns[i]) {
      if ((error = storage_create_index(table, mapper.table_name(), grn_table,
                                        share, &key_info[i], index_tables,
                                        index_columns, i)))
      {
        break;
      }
      if (
        KEY_N_KEY_PARTS(&(key_info[i])) != 1 &&
        key_info[i].algorithm != HA_KEY_ALG_FULLTEXT
      ) {
        mrn_set_bitmap_by_key(table->read_set, &key_info[i]);
        have_multiple_column_index = true;
      }
      grn_index_tables[i] = index_tables[i];
      grn_index_columns[i] = index_columns[i];
    } else {
      index_columns[i] = NULL;
    }
  }
  if (!error && have_multiple_column_index)
  {
    bool skip_unique_key= !table->s->keys_in_use.is_clear_all();
    error = storage_add_index_multiple_columns(key_info, n_keys,
                                               index_tables,
                                               index_columns,
                                               skip_unique_key);
  }
  bitmap_set_all(table->read_set);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
  DBUG_RETURN(error);
}

int ha_mroonga::enable_indexes(key_map map, bool persist)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  share->disable_keys = false;
  if (share->wrapper_mode)
  {
    error = wrapper_enable_indexes(map, persist);
  } else {
    error = storage_enable_indexes(map, persist);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_check(THD* thd, HA_CHECK_OPT* check_opt)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_check(thd, check_opt);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_check(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  mrn::DatabaseRepairer repairer(ctx, thd);
  if (repairer.is_corrupt()) {
    DBUG_RETURN(HA_ADMIN_CORRUPT);
  } else {
    DBUG_RETURN(HA_ADMIN_OK);
  }
}

int ha_mroonga::check(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_check(thd, check_opt);
  } else {
    error = storage_check(thd, check_opt);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_fill_indexes(THD *thd, KEY *key_info,
                                     grn_obj **index_columns, uint n_keys)
{
  int error = 0;
  KEY *p_key_info = &table->key_info[table_share->primary_key];
  KEY *tmp_key_info;
#ifdef MRN_NEED_M_LOCK_TYPE_CHECK_FOR_WRAPPER_EXTERNAL_LOCK
  int wrapper_lock_type_backup = wrap_handler->get_lock_type();
#endif
  MRN_DBUG_ENTER_METHOD();
  DBUG_PRINT("info", ("mroonga: n_keys=%u", n_keys));

  grn_bool need_lock = true;
  if (mrn_lock_type != F_UNLCK) {
    need_lock = false;
  }
#ifdef MRN_NEED_M_LOCK_TYPE_CHECK_FOR_WRAPPER_EXTERNAL_LOCK
  if (wrapper_lock_type_backup != F_UNLCK) {
    need_lock = false;
  }
#endif
  if (need_lock) {
    error = wrapper_external_lock(thd, F_WRLCK);
  }
  if (!error) {
    if (
      !(error = wrapper_start_stmt(thd, thr_lock_data.type)) &&
      !(error = wrapper_rnd_init(true))
    ) {
      grn_obj key;
      GRN_TEXT_INIT(&key, 0);
      grn_bulk_space(ctx, &key, p_key_info->key_length);
      while (!(error = wrapper_rnd_next(table->record[0])))
      {
        key_copy((uchar *)(GRN_TEXT_VALUE(&key)), table->record[0],
                 p_key_info, p_key_info->key_length);
        int added;
        grn_id record_id;
        mrn_change_encoding(ctx, NULL);
        record_id = grn_table_add(ctx, grn_table,
                                  GRN_TEXT_VALUE(&key), p_key_info->key_length,
                                  &added);
        if (record_id == GRN_ID_NIL)
        {
          char error_message[MRN_MESSAGE_BUFFER_SIZE];
          snprintf(error_message, MRN_MESSAGE_BUFFER_SIZE,
                   "failed to add a new record into groonga: key=<%.*s>",
                   (int) p_key_info->key_length, GRN_TEXT_VALUE(&key));
          error = ER_ERROR_ON_WRITE;
          my_message(error, error_message, MYF(0));
        }
        if (error)
          break;

        uint k;
        for (k = 0; k < n_keys; k++) {
          tmp_key_info = &key_info[k];
          if (tmp_key_info->algorithm != HA_KEY_ALG_FULLTEXT &&
            !mrn_is_geo_key(tmp_key_info)) {
            continue;
          }
          if (!index_columns[k]) {
            continue;
          }
          DBUG_PRINT("info", ("mroonga: key_num=%u", k));

          uint l;
          for (l = 0; l < KEY_N_KEY_PARTS(tmp_key_info); l++) {
            Field *field = tmp_key_info->key_part[l].field;

            if (field->is_null())
              continue;
            error = mrn_change_encoding(ctx, field->charset());
            if (error)
              break;

            error = generic_store_bulk(field, &new_value_buffer);
            if (error) {
              my_message(error,
                         "mroonga: wrapper: "
                         "failed to get new value for updating index.",
                         MYF(0));
              break;
            }

            grn_obj *index_column = index_columns[k];
            grn_rc rc;
            rc = grn_column_index_update(ctx, index_column, record_id, l + 1,
                                         NULL, &new_value_buffer);
            grn_obj_unlink(ctx, index_column);
            if (rc) {
              error = ER_ERROR_ON_WRITE;
              my_message(error, ctx->errbuf, MYF(0));
              break;
            }
          }
          if (error)
            break;
        }
        if (error)
          break;
      }
      grn_obj_unlink(ctx, &key);
      if (error != HA_ERR_END_OF_FILE)
        wrapper_rnd_end();
      else
        error = wrapper_rnd_end();
    }
    if (need_lock) {
      wrapper_external_lock(thd, F_UNLCK);
    }
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_recreate_indexes(THD *thd)
{
  int error;
  uint i, n_keys = table_share->keys;
  KEY *p_key_info = &table->key_info[table_share->primary_key];
  KEY *key_info = table->key_info;
  MRN_DBUG_ENTER_METHOD();
  mrn::PathMapper mapper(table_share->normalized_path.str);
  bitmap_clear_all(table->read_set);
  clear_indexes();
  remove_grn_obj_force(mapper.table_name());
  grn_table = NULL;
  mrn_set_bitmap_by_key(table->read_set, p_key_info);
  for (i = 0; i < n_keys; i++) {
    if (key_info[i].algorithm != HA_KEY_ALG_FULLTEXT && !mrn_is_geo_key(&key_info[i])) {
      continue;
    }
    mrn::IndexTableName index_table_name(mapper.table_name(),
                                         table_share->key_info[i].name.str);
    char index_column_full_name[MRN_MAX_PATH_SIZE];
    snprintf(index_column_full_name, MRN_MAX_PATH_SIZE,
             "%s.%s", index_table_name.c_str(), INDEX_COLUMN_NAME);
    remove_grn_obj_force(index_column_full_name);
    remove_grn_obj_force(index_table_name.c_str());

    char index_column_full_old_name[MRN_MAX_PATH_SIZE];
    snprintf(index_column_full_old_name, MRN_MAX_PATH_SIZE,
             "%s.%s", index_table_name.old_c_str(), INDEX_COLUMN_NAME);
    remove_grn_obj_force(index_column_full_old_name);
    remove_grn_obj_force(index_table_name.old_c_str());

    mrn_set_bitmap_by_key(table->read_set, &key_info[i]);
  }
  error = wrapper_create_index(table_share->normalized_path.str, table, share);
  if (error)
    DBUG_RETURN(error);
  error = wrapper_open_indexes(table_share->normalized_path.str);
  if (error)
    DBUG_RETURN(error);
  error = wrapper_fill_indexes(thd, key_info, grn_index_columns, n_keys);
  bitmap_set_all(table->read_set);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_recreate_indexes(THD *thd)
{
  MRN_DBUG_ENTER_METHOD();

  if (share->disable_keys)
    DBUG_RETURN(HA_ADMIN_OK);

  clear_indexes();

  int n_columns = table->s->fields;
  for (int i = 0; i < n_columns; i++) {
    grn_obj *column = grn_columns[i];

    if (!column)
      continue;

    int n_hooks = grn_obj_get_nhooks(ctx, column, GRN_HOOK_SET);
    for (int j = 0; j < n_hooks; j++) {
      grn_obj_delete_hook(ctx, column, GRN_HOOK_SET, j);
    }
  }

  uint n_keys = table_share->keys;
  mrn::PathMapper mapper(table_share->normalized_path.str);
  for (uint i = 0; i < n_keys; i++) {
    if (share->index_table && share->index_table[i])
      continue;

    if (i == table_share->primary_key)
      continue;

    mrn::IndexTableName index_table_name(mapper.table_name(),
                                         table_share->key_info[i].name.str);
    char index_column_full_name[MRN_MAX_PATH_SIZE];
    snprintf(index_column_full_name, MRN_MAX_PATH_SIZE,
             "%s.%s", index_table_name.c_str(), INDEX_COLUMN_NAME);
    remove_grn_obj_force(index_column_full_name);
    remove_grn_obj_force(index_table_name.c_str());

    char index_column_full_old_name[MRN_MAX_PATH_SIZE];
    snprintf(index_column_full_old_name, MRN_MAX_PATH_SIZE,
             "%s.%s", index_table_name.old_c_str(), INDEX_COLUMN_NAME);
    remove_grn_obj_force(index_column_full_old_name);
    remove_grn_obj_force(index_table_name.old_c_str());
  }

  int error;
  error = storage_create_indexes(table, mapper.table_name(), grn_table, share);
  if (error)
    DBUG_RETURN(HA_ADMIN_FAILED);

  error = storage_open_indexes(table_share->normalized_path.str);
  if (error)
    DBUG_RETURN(HA_ADMIN_FAILED);

  DBUG_RETURN(HA_ADMIN_OK);
}

int ha_mroonga::wrapper_repair(THD* thd, HA_CHECK_OPT* check_opt)
{
  int error;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_repair(thd, check_opt);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  if (error && error != HA_ADMIN_NOT_IMPLEMENTED)
    DBUG_RETURN(error);
  error = wrapper_recreate_indexes(thd);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_repair(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  int error = storage_recreate_indexes(thd);
  DBUG_RETURN(error);
}

int ha_mroonga::repair(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  share->disable_keys = false;
  if (share->wrapper_mode)
  {
    error = wrapper_repair(thd, check_opt);
  } else {
    error = storage_repair(thd, check_opt);
  }
  DBUG_RETURN(error);
}

bool ha_mroonga::wrapper_check_and_repair(THD *thd)
{
  bool is_error_or_not_supported;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  is_error_or_not_supported = wrap_handler->ha_check_and_repair(thd);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(is_error_or_not_supported);
}

bool ha_mroonga::storage_check_and_repair(THD *thd)
{
  MRN_DBUG_ENTER_METHOD();
  bool is_error = false;
  mrn::DatabaseRepairer repairer(ctx, thd);
  is_error = !repairer.repair();
  DBUG_RETURN(is_error);
}

bool ha_mroonga::check_and_repair(THD *thd)
{
  MRN_DBUG_ENTER_METHOD();
  bool is_error_or_not_supported;
  if (share->wrapper_mode)
  {
    is_error_or_not_supported = wrapper_check_and_repair(thd);
  } else {
    is_error_or_not_supported = storage_check_and_repair(thd);
  }
  DBUG_RETURN(is_error_or_not_supported);
}

int ha_mroonga::wrapper_analyze(THD* thd, HA_CHECK_OPT* check_opt)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  error = wrap_handler->ha_analyze(thd, check_opt);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_analyze(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(HA_ADMIN_NOT_IMPLEMENTED);
}

int ha_mroonga::analyze(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_analyze(thd, check_opt);
  } else {
    error = storage_analyze(thd, check_opt);
  }
  DBUG_RETURN(error);
}

int ha_mroonga::wrapper_optimize(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(HA_ADMIN_TRY_ALTER);
}

int ha_mroonga::storage_optimize(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(HA_ADMIN_NOT_IMPLEMENTED);
}

int ha_mroonga::optimize(THD* thd, HA_CHECK_OPT* check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  int error = 0;
  if (share->wrapper_mode)
  {
    error = wrapper_optimize(thd, check_opt);
  } else {
    error = storage_optimize(thd, check_opt);
  }
  DBUG_RETURN(error);
}

bool ha_mroonga::wrapper_is_fatal_error(int error_num, uint flags)
{
  bool res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
#ifdef MRN_HANDLER_IS_FATAL_ERROR_HAVE_FLAGS
  res = wrap_handler->is_fatal_error(error_num, flags);
#else
  res = wrap_handler->is_fatal_error(error_num);
#endif
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

bool ha_mroonga::storage_is_fatal_error(int error_num, uint flags)
{
  MRN_DBUG_ENTER_METHOD();
#ifdef MRN_HANDLER_IS_FATAL_ERROR_HAVE_FLAGS
  bool is_fatal_error = handler::is_fatal_error(error_num, flags);
#else
  bool is_fatal_error = handler::is_fatal_error(error_num);
#endif
  DBUG_RETURN(is_fatal_error);
}

bool ha_mroonga::is_fatal_error(int error_num, uint flags)
{
  MRN_DBUG_ENTER_METHOD();
  bool is_fatal_error;
  if (share->wrapper_mode)
  {
    is_fatal_error = wrapper_is_fatal_error(error_num, flags);
  } else {
    is_fatal_error = storage_is_fatal_error(error_num, flags);
  }
  DBUG_RETURN(is_fatal_error);
}

bool ha_mroonga::wrapper_check_if_incompatible_data(
  HA_CREATE_INFO *create_info, uint table_changes)
{
  bool res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->check_if_incompatible_data(create_info, table_changes);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

bool ha_mroonga::storage_check_if_incompatible_data(
  HA_CREATE_INFO *create_info, uint table_changes)
{
  MRN_DBUG_ENTER_METHOD();
  uint n = table_share->fields;
  for (uint i = 0; i < n; i++) {
    Field *field = table->field[i];
    if (field->flags & FIELD_IS_RENAMED) {
      DBUG_RETURN(COMPATIBLE_DATA_NO);
    }
  }
  DBUG_RETURN(COMPATIBLE_DATA_YES);
}

bool ha_mroonga::check_if_incompatible_data(
  HA_CREATE_INFO *create_info, uint table_changes)
{
  MRN_DBUG_ENTER_METHOD();
  bool res;
  if (
    create_info->comment.str != table_share->comment.str
  ) {
    DBUG_RETURN(COMPATIBLE_DATA_NO);
  }
  if (share->wrapper_mode)
  {
    res = wrapper_check_if_incompatible_data(create_info, table_changes);
  } else {
    res = storage_check_if_incompatible_data(create_info, table_changes);
  }
  DBUG_RETURN(res);
}

int ha_mroonga::storage_add_index_multiple_columns(KEY *key_info,
                                                   uint num_of_keys,
                                                   grn_obj **index_tables,
                                                   grn_obj **index_columns,
                                                   bool skip_unique_key)
{
  MRN_DBUG_ENTER_METHOD();

  int error = 0;

  if (!(error = storage_rnd_init(true)))
  {
    while (!(error = storage_rnd_next(table->record[0])))
    {
      for (uint i = 0; i < num_of_keys; i++) {
        KEY *current_key_info = key_info + i;
        if (
          KEY_N_KEY_PARTS(current_key_info) == 1 ||
          current_key_info->algorithm == HA_KEY_ALG_FULLTEXT
          ) {
          continue;
        }
        if (skip_unique_key && (key_info[i].flags & HA_NOSAME)) {
          continue;
        }
        if (!index_columns[i]) {
          continue;
        }

        /* fix key_info.key_length */
        for (uint j = 0; j < KEY_N_KEY_PARTS(current_key_info); j++) {
          if (
            !current_key_info->key_part[j].null_bit &&
            current_key_info->key_part[j].field->null_bit
            ) {
            current_key_info->key_length++;
            current_key_info->key_part[j].null_bit =
              current_key_info->key_part[j].field->null_bit;
          }
        }
        if (key_info[i].flags & HA_NOSAME) {
          grn_id key_id;
          if ((error = storage_write_row_unique_index(table->record[0],
                                                      current_key_info,
                                                      index_tables[i],
                                                      index_columns[i],
                                                      &key_id)))
          {
            if (error == HA_ERR_FOUND_DUPP_KEY)
            {
              error = HA_ERR_FOUND_DUPP_UNIQUE;
            }
            break;
          }
        }
        if ((error = storage_write_row_multiple_column_index(table->record[0],
                                                             record_id,
                                                             current_key_info,
                                                             index_columns[i])))
        {
          break;
        }
      }
      if (error)
        break;
    }
    if (error != HA_ERR_END_OF_FILE) {
      storage_rnd_end();
    } else {
      error = storage_rnd_end();
    }
  }

  DBUG_RETURN(error);
}

#ifdef MRN_HANDLER_HAVE_CHECK_IF_SUPPORTED_INPLACE_ALTER
bool ha_mroonga::wrapper_is_comment_changed(TABLE *table1, TABLE *table2)
{
  MRN_DBUG_ENTER_METHOD();

  if (table1->s->comment.length != table2->s->comment.length) {
    DBUG_RETURN(true);
  }

  if (strncmp(table1->s->comment.str,
              table2->s->comment.str,
              table1->s->comment.length) == 0) {
    DBUG_RETURN(false);
  } else {
    DBUG_RETURN(true);
  }
}

enum_alter_inplace_result ha_mroonga::wrapper_check_if_supported_inplace_alter(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();
  uint n_keys;
  uint i;
  enum_alter_inplace_result result_mroonga = HA_ALTER_INPLACE_NO_LOCK;
  DBUG_PRINT("info",
             ("mroonga: handler_flags=%lu",
              static_cast<ulong>(ha_alter_info->handler_flags)));

  if (wrapper_is_comment_changed(table, altered_table)) {
    DBUG_RETURN(HA_ALTER_INPLACE_NOT_SUPPORTED);
  }
  if (
    (ha_alter_info->handler_flags & ALTER_ADD_NON_UNIQUE_NON_PRIM_INDEX) &&
    (ha_alter_info->handler_flags &
      (
        ALTER_ADD_COLUMN |
        ALTER_DROP_COLUMN |
        MRN_ALTER_INPLACE_INFO_ALTER_STORED_COLUMN_TYPE |
        MRN_ALTER_INPLACE_INFO_ALTER_STORED_COLUMN_ORDER |
        ALTER_COLUMN_NULLABLE |
        ALTER_COLUMN_NOT_NULLABLE |
        ALTER_COLUMN_STORAGE_TYPE |
        ALTER_ADD_STORED_GENERATED_COLUMN |
        ALTER_COLUMN_COLUMN_FORMAT
      )
    )
  ) {
    DBUG_RETURN(HA_ALTER_INPLACE_NOT_SUPPORTED);
  }
  if (ha_alter_info->handler_flags & ALTER_RENAME)
  {
    DBUG_RETURN(HA_ALTER_INPLACE_NOT_SUPPORTED);
  }

  DBUG_ASSERT(ha_alter_info->key_count == altered_table->s->keys);
  alter_key_count = 0;
  alter_index_drop_count = 0;
  alter_index_add_count = 0;
  alter_handler_flags = ha_alter_info->handler_flags;
  if (!(alter_key_info_buffer = (KEY *)
    mrn_my_multi_malloc(MYF(MY_WME | MY_ZEROFILL),
      &alter_key_info_buffer, sizeof(KEY) * ha_alter_info->key_count,
      &alter_index_drop_buffer, sizeof(KEY) * ha_alter_info->index_drop_count,
      &alter_index_add_buffer, sizeof(uint) * ha_alter_info->index_add_count,
      &wrap_altered_table, sizeof(TABLE),
      &wrap_altered_table_key_info, sizeof(KEY) * altered_table->s->keys,
      &wrap_altered_table_share, sizeof(TABLE_SHARE),
      &wrap_altered_table_share_key_info, sizeof(KEY) * altered_table->s->keys,
      NullS))
  ) {
    DBUG_RETURN(HA_ALTER_ERROR);
  }
  *wrap_altered_table= *altered_table;
  *wrap_altered_table_share= *altered_table->s;
  mrn_init_sql_alloc(ha_thd(), &(wrap_altered_table_share->mem_root));

  n_keys = ha_alter_info->index_drop_count;
  for (i = 0; i < n_keys; ++i) {
    const KEY *key = ha_alter_info->index_drop_buffer[i];
    if (key->algorithm == HA_KEY_ALG_FULLTEXT || mrn_is_geo_key(key)) {
      result_mroonga = HA_ALTER_INPLACE_EXCLUSIVE_LOCK;
    } else {
      memcpy(&alter_index_drop_buffer[alter_index_drop_count],
        ha_alter_info->index_drop_buffer[i], sizeof(KEY));
      ++alter_index_drop_count;
    }
  }
  if (!alter_index_drop_count) {
    alter_handler_flags &= ~ALTER_DROP_NON_UNIQUE_NON_PRIM_INDEX;
  }
  n_keys = ha_alter_info->index_add_count;
  for (i = 0; i < n_keys; ++i) {
    const KEY *key =
      &altered_table->key_info[ha_alter_info->index_add_buffer[i]];
    if (key->algorithm == HA_KEY_ALG_FULLTEXT || mrn_is_geo_key(key)) {
      result_mroonga = HA_ALTER_INPLACE_EXCLUSIVE_LOCK;
    } else {
      alter_index_add_buffer[alter_index_add_count] =
        ha_alter_info->index_add_buffer[i];
      ++alter_index_add_count;
    }
  }
  if (!alter_index_add_count) {
    alter_handler_flags &= ~ALTER_ADD_NON_UNIQUE_NON_PRIM_INDEX;
  }
  uint add_index_pos = 0;
  n_keys = ha_alter_info->key_count;
  for (i = 0; i < n_keys; ++i) {
    const KEY *key = &altered_table->key_info[i];
    if (!(key->algorithm == HA_KEY_ALG_FULLTEXT || mrn_is_geo_key(key))) {
      memcpy(&alter_key_info_buffer[alter_key_count],
             &ha_alter_info->key_info_buffer[i], sizeof(KEY));
      memcpy(&wrap_altered_table_key_info[alter_key_count],
             &altered_table->key_info[i], sizeof(KEY));
      memcpy(&wrap_altered_table_share_key_info[alter_key_count],
             &altered_table->s->key_info[i], sizeof(KEY));
      if (add_index_pos < alter_index_add_count &&
             alter_index_add_buffer[add_index_pos] == i) {
        alter_index_add_buffer[add_index_pos] = alter_key_count;
        ++add_index_pos;
      }
      ++alter_key_count;
    }
  }
  wrap_altered_table->key_info = wrap_altered_table_key_info;
  wrap_altered_table_share->key_info = wrap_altered_table_share_key_info;
  wrap_altered_table_share->keys = alter_key_count;
  wrap_altered_table->s = wrap_altered_table_share;

  if (!alter_handler_flags) {
    DBUG_RETURN(result_mroonga);
  }
  enum_alter_inplace_result result;
  MRN_SET_WRAP_ALTER_KEY(this, ha_alter_info);
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  result = wrap_handler->check_if_supported_inplace_alter(wrap_altered_table,
                                                          ha_alter_info);
  MRN_SET_BASE_ALTER_KEY(this, ha_alter_info);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  if (result_mroonga > result)
    DBUG_RETURN(result);
  DBUG_RETURN(result_mroonga);
}

enum_alter_inplace_result ha_mroonga::storage_check_if_supported_inplace_alter(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();
  alter_table_operations explicitly_unsupported_flags =
    ALTER_ADD_FOREIGN_KEY |
    ALTER_DROP_FOREIGN_KEY;
  alter_table_operations supported_flags =
    ALTER_ADD_NON_UNIQUE_NON_PRIM_INDEX |
    ALTER_DROP_NON_UNIQUE_NON_PRIM_INDEX |
    ALTER_ADD_UNIQUE_INDEX |
    ALTER_DROP_UNIQUE_INDEX |
    MRN_ALTER_INPLACE_INFO_ADD_VIRTUAL_COLUMN |
    MRN_ALTER_INPLACE_INFO_ADD_STORED_BASE_COLUMN |
    ALTER_DROP_COLUMN |
    ALTER_INDEX_ORDER |
    ALTER_INDEX_IGNORABILITY |
    ALTER_COLUMN_NAME;
    ;
  if (ha_alter_info->handler_flags & explicitly_unsupported_flags) {
    DBUG_RETURN(HA_ALTER_INPLACE_NOT_SUPPORTED);
  } else if ((ha_alter_info->handler_flags & supported_flags) ==
              ha_alter_info->handler_flags) {
    DBUG_RETURN(HA_ALTER_INPLACE_EXCLUSIVE_LOCK);
  } else {
    DBUG_RETURN(HA_ALTER_INPLACE_NOT_SUPPORTED);
  }
}

enum_alter_inplace_result ha_mroonga::check_if_supported_inplace_alter(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();
  enum_alter_inplace_result result;
  if (share->wrapper_mode) {
    result = wrapper_check_if_supported_inplace_alter(altered_table,
                                                      ha_alter_info);
  } else {
    result = storage_check_if_supported_inplace_alter(altered_table,
                                                      ha_alter_info);
  }
  DBUG_RETURN(result);
}

bool ha_mroonga::wrapper_prepare_inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  bool result;
  MRN_DBUG_ENTER_METHOD();
  if (!alter_handler_flags) {
    DBUG_RETURN(false);
  }

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  int error = 0;
  MRN_SHARE *tmp_share;
  tmp_share = mrn_get_share(altered_table->s->table_name.str,
                            altered_table,
                            &error);
  if (error != 0) {
    DBUG_RETURN(true);
  }

  if (parse_engine_table_options(ha_thd(),
                                  tmp_share->hton,
                                  wrap_altered_table->s)) {
    mrn_free_share(tmp_share);
    DBUG_RETURN(true);
  }
#endif

  MRN_SET_WRAP_ALTER_KEY(this, ha_alter_info);
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  result = wrap_handler->ha_prepare_inplace_alter_table(wrap_altered_table,
                                                        ha_alter_info);
  MRN_SET_BASE_ALTER_KEY(this, ha_alter_info);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);

#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
  mrn_free_share(tmp_share);
#endif

  DBUG_RETURN(result);
}

bool ha_mroonga::storage_prepare_inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(false);
}

bool ha_mroonga::prepare_inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();
  bool result;
  if (share->wrapper_mode) {
    result = wrapper_prepare_inplace_alter_table(altered_table, ha_alter_info);
  } else {
    result = storage_prepare_inplace_alter_table(altered_table, ha_alter_info);
  }
  DBUG_RETURN(result);
}

bool ha_mroonga::wrapper_inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  int error;
  bool result = false;
  uint n_keys;
  uint i, j = 0;
  KEY *key_info = table_share->key_info;
  MRN_DBUG_ENTER_METHOD();
  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(true);

  DBUG_PRINT("info", ("mroonga: table_name=%s", share->table_name));
  mrn::PathMapper mapper(share->table_name);
  n_keys = ha_alter_info->index_drop_count;
  for (i = 0; i < n_keys; ++i) {
    const KEY *key = ha_alter_info->index_drop_buffer[i];
    if (!(key->algorithm == HA_KEY_ALG_FULLTEXT || mrn_is_geo_key(key))) {
      continue;
    }
    while (strcmp(key_info[j].name.str, key->name.str)) {
      ++j;
    }
    DBUG_PRINT("info", ("mroonga: key_name=%s", key->name.str));
    error = drop_index(share, j);
    if (error)
      DBUG_RETURN(true);
    grn_index_tables[j] = NULL;
    grn_index_columns[j] = NULL;
  }

  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_tables,
                                      ha_alter_info->key_count);
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_columns,
                                      ha_alter_info->key_count);
  MRN_SHARE *tmp_share;
  TABLE_SHARE tmp_table_share;
  char **key_tokenizer;
  uint *key_tokenizer_length;
  KEY *p_key_info = &table->key_info[table_share->primary_key];
  bool need_fill_index = false;
  memset(index_tables, 0, sizeof(grn_obj *) * ha_alter_info->key_count);
  memset(index_columns, 0, sizeof(grn_obj *) * ha_alter_info->key_count);
  tmp_table_share.keys = ha_alter_info->key_count;
  tmp_table_share.fields = 0;
  if (!(tmp_share = (MRN_SHARE *)
    mrn_my_multi_malloc(MYF(MY_WME | MY_ZEROFILL),
      &tmp_share, sizeof(*tmp_share),
      &key_tokenizer, sizeof(char *) * (tmp_table_share.keys),
      &key_tokenizer_length, sizeof(uint) * (tmp_table_share.keys),
      NullS))
  ) {
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
    DBUG_RETURN(true);
  }
  tmp_share->engine = NULL;
  tmp_share->table_share = &tmp_table_share;
  tmp_share->index_table = NULL;
  tmp_share->index_table_length = NULL;
  tmp_share->key_tokenizer = key_tokenizer;
  tmp_share->key_tokenizer_length = key_tokenizer_length;
  bitmap_clear_all(table->read_set);
  mrn_set_bitmap_by_key(table->read_set, p_key_info);
  n_keys = ha_alter_info->index_add_count;
  for (i = 0; i < n_keys; ++i) {
    uint key_pos = ha_alter_info->index_add_buffer[i];
    KEY *key = &altered_table->key_info[key_pos];
    if (!(key->algorithm == HA_KEY_ALG_FULLTEXT || mrn_is_geo_key(key))) {
      continue;
    }
    if (share->disable_keys) {
      continue;
    }
    if ((error = mrn_add_index_param(tmp_share, key, key_pos)))
    {
      break;
    }
    DBUG_PRINT("info", ("mroonga: add key pos=%u", key_pos));
    if (
      (key->algorithm == HA_KEY_ALG_FULLTEXT) &&
      (error = wrapper_create_index_fulltext(mapper.table_name(),
                                             key_pos,
                                             key, index_tables, NULL,
                                             tmp_share))
    ) {
      break;
    } else if (
      mrn_is_geo_key(key) &&
      (error = wrapper_create_index_geo(mapper.table_name(),
                                        key_pos, key,
                                        index_tables, NULL, tmp_share))
    ) {
      break;
    }
    mrn_set_bitmap_by_key(table->read_set, key);
    index_columns[key_pos] = grn_obj_column(ctx,
                                            index_tables[key_pos],
                                            INDEX_COLUMN_NAME,
                                            strlen(INDEX_COLUMN_NAME));
    need_fill_index = true;
  }
  if (!error && need_fill_index) {
    mrn::FieldTableChanger changer(altered_table, table);
    error = wrapper_fill_indexes(ha_thd(), altered_table->key_info,
                                 index_columns, ha_alter_info->key_count);
  }
  bitmap_set_all(table->read_set);

  if (!error && alter_handler_flags) {
#ifdef MRN_SUPPORT_CUSTOM_OPTIONS
    {
      MRN_SHARE *alter_tmp_share;
      alter_tmp_share = mrn_get_share(altered_table->s->table_name.str,
                                      altered_table,
                                      &error);
      if (alter_tmp_share) {
        if (parse_engine_table_options(ha_thd(),
                                       alter_tmp_share->hton,
                                       wrap_altered_table->s)) {
          error = MRN_GET_ERROR_NUMBER;
        }
        mrn_free_share(alter_tmp_share);
      }
    }
#endif
    if (!error) {
      MRN_SET_WRAP_ALTER_KEY(this, ha_alter_info);
      MRN_SET_WRAP_SHARE_KEY(share, table->s);
      MRN_SET_WRAP_TABLE_KEY(this, table);
      result = wrap_handler->ha_inplace_alter_table(wrap_altered_table,
                                                    ha_alter_info);
      MRN_SET_BASE_ALTER_KEY(this, ha_alter_info);
      MRN_SET_BASE_SHARE_KEY(share, table->s);
      MRN_SET_BASE_TABLE_KEY(this, table);
    }
  }

  if (result || error)
  {
    n_keys = ha_alter_info->index_add_count;
    for (i = 0; i < n_keys; ++i) {
      uint key_pos = ha_alter_info->index_add_buffer[i];
      KEY *key = &altered_table->key_info[key_pos];
      if (!(key->algorithm == HA_KEY_ALG_FULLTEXT || mrn_is_geo_key(key))) {
        continue;
      }
      if (share->disable_keys) {
        continue;
      }
      if (index_tables[key_pos])
      {
        grn_obj_remove(ctx, index_tables[key_pos]);
      }
    }
    result = true;
  }
  mrn_free_share_alloc(tmp_share);
  my_free(tmp_share);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
  DBUG_RETURN(result);
}

bool ha_mroonga::storage_inplace_alter_table_add_index(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();

  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_tables,
                                      ha_alter_info->key_count);
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_columns,
                                      ha_alter_info->key_count);
  MRN_SHARE *tmp_share;
  TABLE_SHARE tmp_table_share;
  char **index_table, **key_tokenizer, **col_flags, **col_type;
  uint *index_table_length, *key_tokenizer_length, *col_flags_length, *col_type_length;
  bool have_multiple_column_index = false;
  memset(index_tables, 0, sizeof(grn_obj *) * ha_alter_info->key_count);
  memset(index_columns, 0, sizeof(grn_obj *) * ha_alter_info->key_count);
  tmp_table_share.keys = ha_alter_info->key_count;
  tmp_table_share.fields = 0;
  if (!(tmp_share = (MRN_SHARE *)
    mrn_my_multi_malloc(MYF(MY_WME | MY_ZEROFILL),
      &tmp_share, sizeof(*tmp_share),
      &index_table, sizeof(char *) * tmp_table_share.keys,
      &index_table_length, sizeof(uint) * tmp_table_share.keys,
      &key_tokenizer, sizeof(char *) * tmp_table_share.keys,
      &key_tokenizer_length, sizeof(uint) * tmp_table_share.keys,
      &col_flags, sizeof(char *) * tmp_table_share.fields,
      &col_flags_length, sizeof(uint) * tmp_table_share.fields,
      &col_type, sizeof(char *) * tmp_table_share.fields,
      &col_type_length, sizeof(uint) * tmp_table_share.fields,
      NullS))
  ) {
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
    DBUG_RETURN(true);
  }
  tmp_share->engine = NULL;
  tmp_share->table_share = &tmp_table_share;
  tmp_share->index_table = index_table;
  tmp_share->index_table_length = index_table_length;
  tmp_share->key_tokenizer = key_tokenizer;
  tmp_share->key_tokenizer_length = key_tokenizer_length;
  tmp_share->col_flags = col_flags;
  tmp_share->col_flags_length = col_flags_length;
  tmp_share->col_type = col_type;
  tmp_share->col_type_length = col_type_length;
  bitmap_clear_all(table->read_set);
  if (table_share->primary_key != MAX_KEY) {
    KEY *p_key_info = &table->key_info[table_share->primary_key];
    mrn_set_bitmap_by_key(table->read_set, p_key_info);
  }
  int error = 0;
  uint n_keys = ha_alter_info->index_add_count;
  for (uint i = 0; i < n_keys; ++i) {
    uint key_pos = ha_alter_info->index_add_buffer[i];
    KEY *key = &altered_table->key_info[key_pos];
    if (share->disable_keys && !(key->flags & HA_NOSAME)) {
      continue; // key is disabled
    }
    if ((error = mrn_add_index_param(tmp_share, key, key_pos)))
    {
      break;
    }
    DBUG_PRINT("info", ("mroonga: add key pos=%u", key_pos));
    mrn::PathMapper mapper(share->table_name);
    if ((error = storage_create_index(table, mapper.table_name(), grn_table,
                                      tmp_share, key, index_tables,
                                      index_columns, key_pos)))
    {
      break;
    }
    if (
      KEY_N_KEY_PARTS(key) == 1 &&
      (key->flags & HA_NOSAME) &&
      grn_table_size(ctx, grn_table) !=
        grn_table_size(ctx, index_tables[key_pos])
    ) {
      error = HA_ERR_FOUND_DUPP_UNIQUE;
      my_printf_error(ER_DUP_UNIQUE, ER(ER_DUP_UNIQUE), MYF(0),
                      table_share->table_name);
      ++i;
      break;
    }
    if (
      KEY_N_KEY_PARTS(key) != 1 &&
      key->algorithm != HA_KEY_ALG_FULLTEXT
    ) {
      mrn_set_bitmap_by_key(table->read_set, key);
      have_multiple_column_index = true;
    }
  }
  if (!error && have_multiple_column_index) {
    mrn::FieldTableChanger changer(altered_table, table);
    error = storage_add_index_multiple_columns(altered_table->key_info,
                                               ha_alter_info->key_count,
                                               index_tables,
                                               index_columns, false);
    if (error == HA_ERR_FOUND_DUPP_UNIQUE) {
      my_printf_error(ER_DUP_UNIQUE, ER(ER_DUP_UNIQUE), MYF(0),
                      table_share->table_name);
    } else if (error) {
      my_message(error, "failed to create multiple column index", MYF(0));
    }
  }
  bitmap_set_all(table->read_set);

  bool have_error = false;
  if (error)
  {
    n_keys = ha_alter_info->index_add_count;
    for (uint i = 0; i < n_keys; ++i) {
      uint key_pos = ha_alter_info->index_add_buffer[i];
      KEY *key =
        &altered_table->key_info[key_pos];
      if (share->disable_keys && !(key->flags & HA_NOSAME)) {
        continue;
      }
      if (index_tables[key_pos])
      {
        grn_obj_remove(ctx, index_columns[key_pos]);
        grn_obj_remove(ctx, index_tables[key_pos]);
      }
    }
    have_error = true;
  }
  mrn_free_share_alloc(tmp_share);
  my_free(tmp_share);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);

  DBUG_RETURN(have_error);
}

bool ha_mroonga::storage_inplace_alter_table_drop_index(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();

  bool have_error = false;
  uint n_keys;
  uint i, j = 0;
  KEY *key_info = table_share->key_info;
  mrn::PathMapper mapper(share->table_name);
  n_keys = ha_alter_info->index_drop_count;
  for (i = 0; i < n_keys; ++i) {
    KEY *key = ha_alter_info->index_drop_buffer[i];
    while (strcmp(key_info[j].name.str, key->name.str) != 0) {
      ++j;
    }
    int error = drop_index(share, j);
    if (error != 0)
      DBUG_RETURN(true);
    grn_index_tables[j] = NULL;
    grn_index_columns[j] = NULL;
  }

  DBUG_RETURN(have_error);
}

bool ha_mroonga::storage_inplace_alter_table_add_column(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();

  bool have_error = false;

  MRN_SHARE *tmp_share;
  TABLE_SHARE tmp_table_share;
  char **index_table, **key_tokenizer, **col_flags, **col_type;
  uint *index_table_length, *key_tokenizer_length, *col_flags_length, *col_type_length;
  tmp_table_share.keys = 0;
  tmp_table_share.fields = altered_table->s->fields;
  tmp_share = (MRN_SHARE *)mrn_my_multi_malloc(
    MYF(MY_WME | MY_ZEROFILL),
    &tmp_share, sizeof(*tmp_share),
    &index_table, sizeof(char *) * tmp_table_share.keys,
    &index_table_length, sizeof(uint) * tmp_table_share.keys,
    &key_tokenizer, sizeof(char *) * tmp_table_share.keys,
    &key_tokenizer_length, sizeof(uint) * tmp_table_share.keys,
    &col_flags, sizeof(char *) * tmp_table_share.fields,
    &col_flags_length, sizeof(uint) * tmp_table_share.fields,
    &col_type, sizeof(char *) * tmp_table_share.fields,
    &col_type_length, sizeof(uint) * tmp_table_share.fields,
    NullS);
  if (!tmp_share) {
    have_error = true;
    DBUG_RETURN(have_error);
  }
  tmp_share->engine = NULL;
  tmp_share->table_share = &tmp_table_share;
  tmp_share->index_table = index_table;
  tmp_share->index_table_length = index_table_length;
  tmp_share->key_tokenizer = key_tokenizer;
  tmp_share->key_tokenizer_length = key_tokenizer_length;
  tmp_share->col_flags = col_flags;
  tmp_share->col_flags_length = col_flags_length;
  tmp_share->col_type = col_type;
  tmp_share->col_type_length = col_type_length;

  mrn::PathMapper mapper(share->table_name);
  grn_obj *table_obj;
  table_obj = grn_ctx_get(ctx, mapper.table_name(), strlen(mapper.table_name()));

  Alter_info *alter_info = ha_alter_info->alter_info;
  List_iterator_fast<Create_field> create_fields(alter_info->create_list);
  for (uint i = 0; Create_field *create_field = create_fields++; i++) {
    if (create_field->field) {
      continue;
    }

    Field *field = altered_table->s->field[i];

#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_VIRTUAL(field)) {
      continue;
    }
#endif

    mrn::ColumnName column_name(field->field_name);
    int error = mrn_add_column_param(tmp_share, field, i);
    if (error) {
      have_error = true;
      break;
    }

    grn_obj_flags col_flags = GRN_OBJ_PERSISTENT;
    if (!find_column_flags(field, tmp_share, i, &col_flags)) {
      col_flags |= GRN_OBJ_COLUMN_SCALAR;
    }

    grn_obj *col_type;
    {
      int column_type_error_code = ER_WRONG_FIELD_SPEC;
      col_type = find_column_type(field, tmp_share, i, column_type_error_code);
      if (!col_type) {
        error = column_type_error_code;
        have_error = true;
        break;
      }
    }
    char *col_path = NULL; // we don't specify path

    grn_obj *column_obj =
      grn_column_create(ctx, table_obj,
                        column_name.c_str(),
                        column_name.length(),
                        col_path, col_flags, col_type);
    if (ctx->rc) {
      error = ER_WRONG_COLUMN_NAME;
      my_message(error, ctx->errbuf, MYF(0));
      have_error = true;
      break;
    }

#ifdef MRN_SUPPORT_GENERATED_COLUMNS
    if (MRN_GENERATED_COLUMNS_FIELD_IS_STORED(field)) {
#  ifndef MRN_MARIADB_P
      MY_BITMAP generated_column_bitmap;
      if (bitmap_init(&generated_column_bitmap, NULL,
                      altered_table->s->fields, false)) {
        error = HA_ERR_OUT_OF_MEM;
        my_message(ER_OUTOFMEMORY,
                   "mroonga: storage: "
                   "failed to allocate memory for getting generated value",
                    MYF(0));
        have_error = true;
        grn_obj_remove(ctx, column_obj);
        break;
      }
      mrn::SmartBitmap smart_generated_column_bitmap(&generated_column_bitmap);
      bitmap_set_bit(&generated_column_bitmap, field->field_index);
#  endif

      mrn::FieldTableChanger changer(altered_table, table);

      error = storage_rnd_init(true);
      if (error) {
        have_error = true;
        grn_obj_remove(ctx, column_obj);
        break;
      }

      Field *altered_field = altered_table->field[i];
      grn_obj new_value;
      GRN_VOID_INIT(&new_value);
      mrn::SmartGrnObj smart_new_value(ctx, &new_value);
      while (!have_error) {
        int next_error = storage_rnd_next(table->record[0]);
        if (next_error == HA_ERR_END_OF_FILE) {
          break;
        } else if (next_error != 0) {
          error = next_error;
          have_error = true;
          grn_obj_remove(ctx, column_obj);
          break;
        }

#  ifdef MRN_MARIADB_P
        MRN_GENERATED_COLUMNS_UPDATE_VIRTUAL_FIELD(altered_table, altered_field);
#  else
        if (update_generated_write_fields(&generated_column_bitmap, altered_table)) {
          error = ER_ERROR_ON_WRITE;
          my_message(error,
                     "mroonga: storage: "
                     "failed to update generated value for updating column",
                     MYF(0));
          have_error = true;
          grn_obj_remove(ctx, column_obj);
          break;
        }
#  endif

        error = mrn_change_encoding(ctx, altered_field->charset());
        if (error) {
          my_message(error,
                     "mroonga: storage: "
                     "failed to change encoding to store generated value",
                     MYF(0));
          have_error = true;
          grn_obj_remove(ctx, column_obj);
          break;
        }
        error = generic_store_bulk(altered_field, &new_value);
        if (error) {
          my_message(error,
                     "mroonga: storage: "
                     "failed to get generated value for updating column",
                     MYF(0));
          have_error = true;
          grn_obj_remove(ctx, column_obj);
          break;
        }

        grn_obj_set_value(ctx, column_obj, record_id, &new_value, GRN_OBJ_SET);
        if (ctx->rc) {
          error = ER_ERROR_ON_WRITE;
          my_message(error, ctx->errbuf, MYF(0));
          break;
        }
      }

      int end_error = storage_rnd_end();
      if (end_error != 0 && error == 0) {
        error = end_error;
        grn_obj_remove(ctx, column_obj);
        break;
      }
    }
#endif
  }

  grn_obj_unlink(ctx, table_obj);

  mrn_free_share_alloc(tmp_share);
  my_free(tmp_share);

  DBUG_RETURN(have_error);
}

bool ha_mroonga::storage_inplace_alter_table_drop_column(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();

  bool have_error = false;

  mrn::PathMapper mapper(share->table_name);
  grn_obj *table_obj;
  table_obj = grn_ctx_get(ctx, mapper.table_name(), strlen(mapper.table_name()));

  Alter_info *alter_info = ha_alter_info->alter_info;

  uint n_fields = table->s->fields;
  for (uint i = 0; i < n_fields; i++) {
    Field *field = table->field[i];

    bool dropped = true;
    List_iterator_fast<Create_field> create_fields(alter_info->create_list);
    while (Create_field *create_field = create_fields++) {
      if (create_field->field == field) {
        dropped = false;
        break;
      }
    }
    if (!dropped) {
      continue;
    }

    const char *column_name = field->field_name.str;
    int column_name_size = field->field_name.length;

    grn_obj *column_obj;
    column_obj = grn_obj_column(ctx, table_obj, column_name, column_name_size);
    if (column_obj) {
      grn_obj_remove(ctx, column_obj);
    }
    if (ctx->rc) {
      int error = ER_WRONG_COLUMN_NAME;
      my_message(error, ctx->errbuf, MYF(0));
      have_error = true;
      break;
    }
  }
  grn_obj_unlink(ctx, table_obj);

  DBUG_RETURN(have_error);
}

bool ha_mroonga::storage_inplace_alter_table_rename_column(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();

  bool have_error = false;

  mrn::PathMapper mapper(share->table_name);
  grn_obj *table_obj;
  table_obj = grn_ctx_get(ctx, mapper.table_name(), strlen(mapper.table_name()));

  Alter_info *alter_info = ha_alter_info->alter_info;
  uint n_fields = table->s->fields;
  for (uint i = 0; i < n_fields; i++) {
    Field *field = table->field[i];

    if (!(field->flags & FIELD_IS_RENAMED)) {
      continue;
    }

    LEX_CSTRING new_name;
    new_name.str= 0;
    List_iterator_fast<Create_field> create_fields(alter_info->create_list);
    while (Create_field *create_field = create_fields++) {
      if (create_field->field == field) {
        new_name = create_field->field_name;
        break;
      }
    }

    if (!new_name.str) {
      continue;
    }

    const char *old_name = field->field_name.str;
    grn_obj *column_obj;
    column_obj = grn_obj_column(ctx, table_obj, old_name,
                                field->field_name.length);
    if (column_obj) {
      grn_column_rename(ctx, column_obj, new_name.str, new_name.length);
      if (ctx->rc) {
        int error = ER_WRONG_COLUMN_NAME;
        my_message(error, ctx->errbuf, MYF(0));
        have_error = true;
      }
      grn_obj_unlink(ctx, column_obj);
    }

    if (have_error) {
      break;
    }
  }
  grn_obj_unlink(ctx, table_obj);

  DBUG_RETURN(have_error);
}

bool ha_mroonga::storage_inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();

  bool have_error = false;

  int error = mrn_change_encoding(ctx, system_charset_info);
  if (error) {
    have_error = true;
  }

  alter_table_operations drop_index_related_flags =
    ALTER_DROP_INDEX |
    ALTER_DROP_NON_UNIQUE_NON_PRIM_INDEX |
    ALTER_DROP_UNIQUE_INDEX |
    ALTER_DROP_PK_INDEX;
  if (!have_error &&
      (ha_alter_info->handler_flags & drop_index_related_flags)) {
    have_error = storage_inplace_alter_table_drop_index(altered_table,
                                                        ha_alter_info);
  }

  alter_table_operations add_column_related_flags =
    ALTER_ADD_COLUMN;
  if (!have_error &&
      (ha_alter_info->handler_flags & add_column_related_flags)) {
    have_error = storage_inplace_alter_table_add_column(altered_table, ha_alter_info);
  }

  alter_table_operations drop_column_related_flags = ALTER_DROP_COLUMN;
  if (!have_error &&
      (ha_alter_info->handler_flags & drop_column_related_flags)) {
    have_error = storage_inplace_alter_table_drop_column(altered_table, ha_alter_info);
  }

  alter_table_operations rename_column_related_flags = ALTER_COLUMN_NAME;
  if (!have_error &&
      (ha_alter_info->handler_flags & rename_column_related_flags)) {
    have_error = storage_inplace_alter_table_rename_column(altered_table, ha_alter_info);
  }

  alter_table_operations add_index_related_flags =
    ALTER_ADD_INDEX |
    ALTER_ADD_NON_UNIQUE_NON_PRIM_INDEX |
    ALTER_ADD_UNIQUE_INDEX |
    ALTER_ADD_PK_INDEX;
  if (!have_error &&
      (ha_alter_info->handler_flags & add_index_related_flags)) {
    have_error = storage_inplace_alter_table_add_index(altered_table,
                                                       ha_alter_info);
  }

  DBUG_RETURN(have_error);
}

bool ha_mroonga::inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info)
{
  MRN_DBUG_ENTER_METHOD();
  bool result;
  if (share->wrapper_mode) {
    result = wrapper_inplace_alter_table(altered_table, ha_alter_info);
  } else {
    result = storage_inplace_alter_table(altered_table, ha_alter_info);
  }
  DBUG_RETURN(result);
}

bool ha_mroonga::wrapper_commit_inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info,
  bool commit)
{
  bool result;
  MRN_DBUG_ENTER_METHOD();
  if (!alter_handler_flags) {
    free_root(&(wrap_altered_table_share->mem_root), MYF(0));
    my_free(alter_key_info_buffer);
    alter_key_info_buffer = NULL;
    DBUG_RETURN(false);
  }
  MRN_SET_WRAP_ALTER_KEY(this, ha_alter_info);
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  result = wrap_handler->ha_commit_inplace_alter_table(wrap_altered_table,
                                                       ha_alter_info,
                                                       commit);
  MRN_SET_BASE_ALTER_KEY(this, ha_alter_info);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  free_root(&(wrap_altered_table_share->mem_root), MYF(0));
  my_free(alter_key_info_buffer);
  alter_key_info_buffer = NULL;
  DBUG_RETURN(result);
}

bool ha_mroonga::storage_commit_inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info,
  bool commit)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(false);
}

bool ha_mroonga::commit_inplace_alter_table(
  TABLE *altered_table,
  Alter_inplace_info *ha_alter_info,
  bool commit)
{
  MRN_DBUG_ENTER_METHOD();
  bool result;
  if (share->wrapper_mode) {
    result = wrapper_commit_inplace_alter_table(altered_table, ha_alter_info,
                                                commit);
  } else {
    result = storage_commit_inplace_alter_table(altered_table, ha_alter_info,
                                                commit);
  }
  DBUG_RETURN(result);
}
#else
alter_table_operations ha_mroonga::wrapper_alter_table_flags(alter_table_operations flags)
{
  alter_table_operations res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->alter_table_flags(flags);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

alter_table_operations ha_mroonga::storage_alter_table_flags(alter_table_operations flags)
{
  MRN_DBUG_ENTER_METHOD();
  alter_table_operations res = handler::alter_table_flags(flags);
  DBUG_RETURN(res);
}

alter_table_operations ha_mroonga::alter_table_flags(alter_table_operations flags)
{
  MRN_DBUG_ENTER_METHOD();
  alter_table_operations res;
  if (share->wrapper_mode)
  {
    res = wrapper_alter_table_flags(flags);
  } else {
    res = storage_alter_table_flags(flags);
  }
  DBUG_RETURN(res);
}

#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
int ha_mroonga::wrapper_add_index(TABLE *table_arg, KEY *key_info,
                                  uint num_of_keys, handler_add_index **add)
#else
int ha_mroonga::wrapper_add_index(TABLE *table_arg, KEY *key_info,
                                  uint num_of_keys)
#endif
{
  int error = 0;
  uint i, j, k;
  uint n_keys = table->s->keys;
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_tables, num_of_keys + n_keys);
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_columns, num_of_keys + n_keys);
  THD *thd = ha_thd();
  MRN_SHARE *tmp_share;
  TABLE_SHARE tmp_table_share;
  char **key_tokenizer;
  uint *key_tokenizer_length;
  MRN_DBUG_ENTER_METHOD();
  if (!(wrap_alter_key_info = (KEY *) mrn_my_malloc(sizeof(KEY) * num_of_keys,
                                                    MYF(MY_WME)))) {
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
  }
  KEY *p_key_info = &table->key_info[table_share->primary_key], *tmp_key_info;
  tmp_table_share.keys = n_keys + num_of_keys;
  tmp_table_share.fields = 0;
  if (!(tmp_share = (MRN_SHARE *)
    mrn_my_multi_malloc(MYF(MY_WME | MY_ZEROFILL),
      &tmp_share, sizeof(*tmp_share),
      &key_tokenizer, sizeof(char *) * (n_keys + num_of_keys),
      &key_tokenizer_length, sizeof(uint) * (n_keys + num_of_keys),
      NullS))
  ) {
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
  }
  tmp_share->engine = NULL;
  tmp_share->table_share = &tmp_table_share;
  tmp_share->index_table = NULL;
  tmp_share->index_table_length = NULL;
  tmp_share->key_tokenizer = key_tokenizer;
  tmp_share->key_tokenizer_length = key_tokenizer_length;
  tmp_share->col_flags = NULL;
  tmp_share->col_type = NULL;
#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
  hnd_add_index = NULL;
#endif
  bitmap_clear_all(table->read_set);
  mrn_set_bitmap_by_key(table->read_set, p_key_info);
  mrn::PathMapper mapper(share->table_name);
  for (i = 0, j = 0; i < num_of_keys; i++) {
    if (key_info[i].algorithm != HA_KEY_ALG_FULLTEXT && !mrn_is_geo_key(&key_info[i])) {
      wrap_alter_key_info[j] = key_info[i];
      j++;
      continue;
    }
    if (share->disable_keys) {
      continue;
    }
    if ((error = mrn_add_index_param(tmp_share, &key_info[i], i + n_keys)))
    {
      break;
    }
    index_tables[i + n_keys] = NULL;
    if (
      (key_info[i].algorithm == HA_KEY_ALG_FULLTEXT) &&
      (error = wrapper_create_index_fulltext(mapper.table_name(),
                                             i + n_keys,
                                             &key_info[i], index_tables, NULL,
                                             tmp_share))
    ) {
      break;
    } else if (
      mrn_is_geo_key(&key_info[i]) &&
      (error = wrapper_create_index_geo(mapper.table_name(),
                                        i + n_keys, &key_info[i],
                                        index_tables, NULL, tmp_share))
    ) {
      break;
    }
    mrn_set_bitmap_by_key(table->read_set, &key_info[i]);
  }
  if (!error && i > j && !share->disable_keys) {
    for (k = 0; k < num_of_keys; k++) {
      tmp_key_info = &key_info[k];
      if (tmp_key_info->algorithm != HA_KEY_ALG_FULLTEXT &&
        !mrn_is_geo_key(tmp_key_info)) {
        continue;
      }
      index_columns[k + n_keys] = grn_obj_column(ctx,
                                                 index_tables[k + n_keys],
                                                 INDEX_COLUMN_NAME,
                                                 strlen(INDEX_COLUMN_NAME));
    }
    error = wrapper_fill_indexes(thd, key_info, &index_columns[n_keys],
                                 num_of_keys);
  }
  bitmap_set_all(table->read_set);

  if (!error && j)
  {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
    error = wrap_handler->add_index(table_arg, wrap_alter_key_info, j,
                                    &hnd_add_index);
#else
    error = wrap_handler->add_index(table_arg, wrap_alter_key_info, j);
#endif
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  if (error)
  {
    for (k = 0; k < i; k++) {
      if (key_info[k].algorithm != HA_KEY_ALG_FULLTEXT && !mrn_is_geo_key(&key_info[k]))
      {
        continue;
      }
      if (index_tables[k + n_keys])
      {
        grn_obj_remove(ctx, index_tables[k + n_keys]);
      }
    }
  }
#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
  else {
    *add = new handler_add_index(table_arg, key_info, num_of_keys);
  }
#endif
  mrn_free_share_alloc(tmp_share);
  my_free(tmp_share);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
  DBUG_RETURN(error);
}

#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
int ha_mroonga::storage_add_index(TABLE *table_arg, KEY *key_info,
                                  uint num_of_keys, handler_add_index **add)
#else
int ha_mroonga::storage_add_index(TABLE *table_arg, KEY *key_info,
                                  uint num_of_keys)
#endif
{
  int error = 0;
  uint i;
  uint n_keys = table->s->keys;
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_tables, num_of_keys + n_keys);
  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(grn_obj *, index_columns, num_of_keys + n_keys);
  MRN_SHARE *tmp_share;
  TABLE_SHARE tmp_table_share;
  char **index_table, **key_tokenizer, **col_flags, **col_type;
  uint *index_table_length, *key_tokenizer_length, *col_flags_length, *col_type_length;
  bool have_multiple_column_index = false;

  MRN_DBUG_ENTER_METHOD();
  tmp_table_share.keys = n_keys + num_of_keys;
  tmp_table_share.fields = 0;
  if (!(tmp_share = (MRN_SHARE *)
    mrn_my_multi_malloc(MYF(MY_WME | MY_ZEROFILL),
      &tmp_share, sizeof(*tmp_share),
      &index_table, sizeof(char*) *  tmp_table_share.keys,
      &index_table_length, sizeof(uint) * tmp_table_share.keys,
      &key_tokenizer, sizeof(char *) * tmp_table_share.keys,
      &key_tokenizer_length, sizeof(uint) * tmp_table_share.keys,
      &col_flags, sizeof(char *) * tmp_table_share.fields,
      &col_flags_length, sizeof(uint) * tmp_table_share.fields,
      &col_type, sizeof(char *) * tmp_table_share.fields,
      &col_type_length, sizeof(uint) * tmp_table_share.fields,
      NullS))
  ) {
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
    MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
  }
  tmp_share->engine = NULL;
  tmp_share->table_share = &tmp_table_share;
  tmp_share->index_table = index_table;
  tmp_share->index_table_length = index_table_length;
  tmp_share->key_tokenizer = key_tokenizer;
  tmp_share->key_tokenizer_length = key_tokenizer_length;
  tmp_share->col_flags = col_flags;
  tmp_share->col_flags_length = col_flags_length;
  tmp_share->col_type = col_type;
  tmp_share->col_type_length = col_type_length;
  bitmap_clear_all(table->read_set);
  mrn::PathMapper mapper(share->table_name);
  for (i = 0; i < num_of_keys; i++) {
    if (share->disable_keys && !(key_info[i].flags & HA_NOSAME)) {
      continue; // key is disabled
    }
    index_tables[i + n_keys] = NULL;
    index_columns[i + n_keys] = NULL;
    if ((error = mrn_add_index_param(tmp_share, &key_info[i], i + n_keys)))
    {
      break;
    }
    if ((error = storage_create_index(table, mapper.table_name(), grn_table,
                                      tmp_share, &key_info[i], index_tables,
                                      index_columns, i + n_keys)))
    {
      break;
    }
    if (
      KEY_N_KEY_PARTS(&(key_info[i])) == 1 &&
      (key_info[i].flags & HA_NOSAME) &&
      grn_table_size(ctx, grn_table) !=
        grn_table_size(ctx, index_tables[i + n_keys])
    ) {
      error = HA_ERR_FOUND_DUPP_UNIQUE;
      i++;
      break;
    }
    if (
      KEY_N_KEY_PARTS(&(key_info[i])) != 1 &&
      key_info[i].algorithm != HA_KEY_ALG_FULLTEXT
    ) {
      mrn_set_bitmap_by_key(table->read_set, &key_info[i]);
      have_multiple_column_index = true;
    }
  }
  if (!error && have_multiple_column_index)
  {
    error = storage_add_index_multiple_columns(key_info, num_of_keys,
                                               index_tables + n_keys,
                                               index_columns + n_keys, false);
  }
  bitmap_set_all(table->read_set);
  if (error)
  {
    for (uint j = 0; j < i; j++) {
      if (index_tables[j + n_keys])
      {
        grn_obj_remove(ctx, index_columns[j + n_keys]);
        grn_obj_remove(ctx, index_tables[j + n_keys]);
      }
    }
  }
#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
  else {
    *add = new handler_add_index(table_arg, key_info, num_of_keys);
  }
#endif
  mrn_free_share_alloc(tmp_share);
  my_free(tmp_share);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_tables);
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(index_columns);
  DBUG_RETURN(error);
}
#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
int ha_mroonga::add_index(TABLE *table_arg, KEY *key_info,
                          uint num_of_keys, handler_add_index **add)
{
  MRN_DBUG_ENTER_METHOD();
  int error;
  if (share->wrapper_mode)
  {
    error = wrapper_add_index(table_arg, key_info, num_of_keys, add);
  } else {
    error = storage_add_index(table_arg, key_info, num_of_keys, add);
  }
  DBUG_RETURN(error);
}
#else
int ha_mroonga::add_index(TABLE *table_arg, KEY *key_info,
                          uint num_of_keys)
{
  MRN_DBUG_ENTER_METHOD();
  int error;
  if (share->wrapper_mode)
  {
    error = wrapper_add_index(table_arg, key_info, num_of_keys);
  } else {
    error = storage_add_index(table_arg, key_info, num_of_keys);
  }
  DBUG_RETURN(error);
}
#endif

#ifdef MRN_HANDLER_HAVE_FINAL_ADD_INDEX
int ha_mroonga::wrapper_final_add_index(handler_add_index *add, bool commit)
{
  int error = 0;
  MRN_DBUG_ENTER_METHOD();
  if (hnd_add_index)
  {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    error = wrap_handler->final_add_index(hnd_add_index, commit);
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  if (add)
  {
    delete add;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::storage_final_add_index(handler_add_index *add, bool commit)
{
  MRN_DBUG_ENTER_METHOD();
  if (add)
  {
    delete add;
  }
  DBUG_RETURN(0);
}

int ha_mroonga::final_add_index(handler_add_index *add, bool commit)
{
  MRN_DBUG_ENTER_METHOD();
  int error;
  if (share->wrapper_mode)
  {
    error = wrapper_final_add_index(add, commit);
  } else {
    error = storage_final_add_index(add, commit);
  }
  DBUG_RETURN(error);
}
#endif

int ha_mroonga::wrapper_prepare_drop_index(TABLE *table_arg, uint *key_num,
  uint num_of_keys)
{
  int res = 0;
  uint i, j;
  KEY *key_info = table_share->key_info;
  MRN_DBUG_ENTER_METHOD();
  res = mrn_change_encoding(ctx, system_charset_info);
  if (res)
    DBUG_RETURN(res);

  MRN_ALLOCATE_VARIABLE_LENGTH_ARRAYS(uint, wrap_key_num, num_of_keys);
  for (i = 0, j = 0; i < num_of_keys; i++) {
    uint key_index = key_num[i];
    if (key_info[key_index].algorithm != HA_KEY_ALG_FULLTEXT &&
        !mrn_is_geo_key(&key_info[key_index])) {
      wrap_key_num[j] = share->wrap_key_nr[key_index];
      j++;
      continue;
    }

    res = drop_index(share, key_index);
    if (res)
      DBUG_RETURN(res);
    grn_index_tables[key_index] = NULL;
    grn_index_columns[key_index] = NULL;
  }
  if (j)
  {
    MRN_SET_WRAP_SHARE_KEY(share, table->s);
    MRN_SET_WRAP_TABLE_KEY(this, table);
    res = wrap_handler->prepare_drop_index(table_arg, wrap_key_num, j);
    MRN_SET_BASE_SHARE_KEY(share, table->s);
    MRN_SET_BASE_TABLE_KEY(this, table);
  }
  MRN_FREE_VARIABLE_LENGTH_ARRAYS(wrap_key_num);
  DBUG_RETURN(res);
}

int ha_mroonga::storage_prepare_drop_index(TABLE *table_arg, uint *key_num,
                                           uint num_of_keys)
{
  int error;
  uint i;
  MRN_DBUG_ENTER_METHOD();
  error = mrn_change_encoding(ctx, system_charset_info);
  if (error)
    DBUG_RETURN(error);

  for (i = 0; i < num_of_keys; i++) {
    uint key_index = key_num[i];
    error = drop_index(share, key_index);
    if (error)
      break;
    grn_index_tables[key_index] = NULL;
    grn_index_columns[key_index] = NULL;
  }
  DBUG_RETURN(error);
}

int ha_mroonga::prepare_drop_index(TABLE *table_arg, uint *key_num,
  uint num_of_keys)
{
  MRN_DBUG_ENTER_METHOD();
  int res;
  if (share->wrapper_mode)
  {
    res = wrapper_prepare_drop_index(table_arg, key_num, num_of_keys);
  } else {
    res = storage_prepare_drop_index(table_arg, key_num, num_of_keys);
  }
  DBUG_RETURN(res);
}

int ha_mroonga::wrapper_final_drop_index(TABLE *table_arg)
{
  uint res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->final_drop_index(table_arg);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

int ha_mroonga::storage_final_drop_index(TABLE *table_arg)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_RETURN(0);
}

int ha_mroonga::final_drop_index(TABLE *table_arg)
{
  MRN_DBUG_ENTER_METHOD();
  uint res;
  if (share->wrapper_mode)
  {
    res = wrapper_final_drop_index(table_arg);
  } else {
    res = storage_final_drop_index(table_arg);
  }
  DBUG_RETURN(res);
}
#endif

int ha_mroonga::wrapper_update_auto_increment()
{
  int res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->update_auto_increment();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

int ha_mroonga::storage_update_auto_increment()
{
  MRN_DBUG_ENTER_METHOD();
  int res = handler::update_auto_increment();
  DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
    table->next_number_field->val_int()));
  DBUG_RETURN(res);
}

int ha_mroonga::update_auto_increment()
{
  MRN_DBUG_ENTER_METHOD();
  int res;
  if (share->wrapper_mode)
  {
    res = wrapper_update_auto_increment();
  } else {
    res = storage_update_auto_increment();
  }
  DBUG_RETURN(res);
}

void ha_mroonga::wrapper_set_next_insert_id(ulonglong id)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->set_next_insert_id(id);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_set_next_insert_id(ulonglong id)
{
  MRN_DBUG_ENTER_METHOD();
  handler::set_next_insert_id(id);
  DBUG_VOID_RETURN;
}

void ha_mroonga::set_next_insert_id(ulonglong id)
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    wrapper_set_next_insert_id(id);
  } else {
    storage_set_next_insert_id(id);
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::wrapper_get_auto_increment(ulonglong offset,
                                            ulonglong increment,
                                            ulonglong nb_desired_values,
                                            ulonglong *first_value,
                                            ulonglong *nb_reserved_values)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->get_auto_increment(offset, increment, nb_desired_values,
                                      first_value, nb_reserved_values);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_get_auto_increment(ulonglong offset,
                                            ulonglong increment,
                                            ulonglong nb_desired_values,
                                            ulonglong *first_value,
                                            ulonglong *nb_reserved_values)
{
  MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
  MRN_DBUG_ENTER_METHOD();
  if (table->found_next_number_field &&
      !table->s->next_number_keypart) {
    if (long_term_share->auto_inc_inited) {
      *first_value = long_term_share->auto_inc_value;
      DBUG_PRINT("info", ("mroonga: *first_value(auto_inc_value)=%llu",
        *first_value));
      *nb_reserved_values = UINT_MAX64;
    } else {
      handler::get_auto_increment(offset, increment, nb_desired_values,
                                  first_value, nb_reserved_values);
      long_term_share->auto_inc_value = *first_value;
      DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
        long_term_share->auto_inc_value));
      long_term_share->auto_inc_inited = true;
    }
  } else {
    handler::get_auto_increment(offset, increment, nb_desired_values,
                                first_value, nb_reserved_values);
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::get_auto_increment(ulonglong offset, ulonglong increment,
                                    ulonglong nb_desired_values,
                                    ulonglong *first_value,
                                    ulonglong *nb_reserved_values)
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    wrapper_get_auto_increment(offset, increment, nb_desired_values,
                               first_value, nb_reserved_values);
  } else {
    MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
    mrn::Lock lock(&long_term_share->auto_inc_mutex);
    storage_get_auto_increment(offset, increment, nb_desired_values,
                               first_value, nb_reserved_values);
    long_term_share->auto_inc_value += nb_desired_values * increment;
    DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
      long_term_share->auto_inc_value));
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::wrapper_restore_auto_increment(ulonglong prev_insert_id)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->restore_auto_increment(prev_insert_id);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_restore_auto_increment(ulonglong prev_insert_id)
{
  MRN_DBUG_ENTER_METHOD();
  handler::restore_auto_increment(prev_insert_id);
  DBUG_VOID_RETURN;
}

void ha_mroonga::restore_auto_increment(ulonglong prev_insert_id)
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    wrapper_restore_auto_increment(prev_insert_id);
  } else {
    storage_restore_auto_increment(prev_insert_id);
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::wrapper_release_auto_increment()
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->ha_release_auto_increment();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_release_auto_increment()
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_VOID_RETURN;
}

void ha_mroonga::release_auto_increment()
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    wrapper_release_auto_increment();
  } else {
    storage_release_auto_increment();
  }
  DBUG_VOID_RETURN;
}

int ha_mroonga::wrapper_check_for_upgrade(HA_CHECK_OPT *check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  int error = wrap_handler->ha_check_for_upgrade(check_opt);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(error);
}

int ha_mroonga::storage_check_for_upgrade(HA_CHECK_OPT *check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  for (uint i = 0; i < table->s->fields; ++i) {
    grn_obj *column = grn_columns[i];
    if (!column) {
      continue;
    }
    Field *field = table->field[i];
    grn_id column_range = grn_obj_get_range(ctx, column);
    switch (field->real_type()) {
    case MYSQL_TYPE_ENUM:
      if (column_range != GRN_DB_UINT16) {
        DBUG_RETURN(HA_ADMIN_NEEDS_ALTER);
      }
      break;
    case MYSQL_TYPE_SET:
      if (column_range != GRN_DB_UINT64) {
        DBUG_RETURN(HA_ADMIN_NEEDS_ALTER);
      }
      break;
    default:
      break;
    }
  }
  DBUG_RETURN(HA_ADMIN_OK);
}

int ha_mroonga::check_for_upgrade(HA_CHECK_OPT *check_opt)
{
  MRN_DBUG_ENTER_METHOD();
  int error;
  if (share->wrapper_mode) {
    error = wrapper_check_for_upgrade(check_opt);
  } else {
    error = storage_check_for_upgrade(check_opt);
  }
  DBUG_RETURN(error);
}

#ifdef MRN_HANDLER_HAVE_RESET_AUTO_INCREMENT
int ha_mroonga::wrapper_reset_auto_increment(ulonglong value)
{
  int res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->ha_reset_auto_increment(value);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

int ha_mroonga::storage_reset_auto_increment(ulonglong value)
{
  MRN_LONG_TERM_SHARE *long_term_share = share->long_term_share;
  MRN_DBUG_ENTER_METHOD();
  mrn::Lock lock(&long_term_share->auto_inc_mutex);
  long_term_share->auto_inc_value = value;
  DBUG_PRINT("info", ("mroonga: auto_inc_value=%llu",
    long_term_share->auto_inc_value));
  long_term_share->auto_inc_inited = true;
  DBUG_RETURN(0);
}

int ha_mroonga::reset_auto_increment(ulonglong value)
{
  MRN_DBUG_ENTER_METHOD();
  int res;
  if (share->wrapper_mode)
  {
    res = wrapper_reset_auto_increment(value);
  } else {
    res = storage_reset_auto_increment(value);
  }
  DBUG_RETURN(res);
}
#endif

void ha_mroonga::set_pk_bitmap()
{
  MRN_DBUG_ENTER_METHOD();
  KEY *key_info = &(table->key_info[table_share->primary_key]);
  uint j;
  for (j = 0; j < KEY_N_KEY_PARTS(key_info); j++) {
    Field *field = key_info->key_part[j].field;
    bitmap_set_bit(table->read_set, field->field_index);
  }
  DBUG_VOID_RETURN;
}

bool ha_mroonga::wrapper_was_semi_consistent_read()
{
  bool res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->was_semi_consistent_read();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

bool ha_mroonga::storage_was_semi_consistent_read()
{
  bool res;
  MRN_DBUG_ENTER_METHOD();
  res = handler::was_semi_consistent_read();
  DBUG_RETURN(res);
}

bool ha_mroonga::was_semi_consistent_read()
{
  bool res;
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    res = wrapper_was_semi_consistent_read();
  } else {
    res = storage_was_semi_consistent_read();
  }
  DBUG_RETURN(res);
}

void ha_mroonga::wrapper_try_semi_consistent_read(bool yes)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->try_semi_consistent_read(yes);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_try_semi_consistent_read(bool yes)
{
  MRN_DBUG_ENTER_METHOD();
  handler::try_semi_consistent_read(yes);
  DBUG_VOID_RETURN;
}

void ha_mroonga::try_semi_consistent_read(bool yes)
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    wrapper_try_semi_consistent_read(yes);
  } else {
    storage_try_semi_consistent_read(yes);
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::wrapper_unlock_row()
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->unlock_row();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_unlock_row()
{
  MRN_DBUG_ENTER_METHOD();
  handler::unlock_row();
  DBUG_VOID_RETURN;
}

void ha_mroonga::unlock_row()
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    wrapper_unlock_row();
  } else {
    storage_unlock_row();
  }
  DBUG_VOID_RETURN;
}

int ha_mroonga::wrapper_start_stmt(THD *thd, thr_lock_type lock_type)
{
  int res;
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->start_stmt(thd, lock_type);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

int ha_mroonga::storage_start_stmt(THD *thd, thr_lock_type lock_type)
{
  int res;
  MRN_DBUG_ENTER_METHOD();
  res = handler::start_stmt(thd, lock_type);
  DBUG_RETURN(res);
}

int ha_mroonga::start_stmt(THD *thd, thr_lock_type lock_type)
{
  int res;
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    res = wrapper_start_stmt(thd, lock_type);
  } else {
    res = storage_start_stmt(thd, lock_type);
  }
  DBUG_RETURN(res);
}

void ha_mroonga::wrapper_change_table_ptr(TABLE *table_arg,
                                          TABLE_SHARE *share_arg)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->change_table_ptr(table_arg, share->wrap_table_share);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_change_table_ptr(TABLE *table_arg,
                                          TABLE_SHARE *share_arg)
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_VOID_RETURN;
}

void ha_mroonga::change_table_ptr(TABLE *table_arg, TABLE_SHARE *share_arg)
{
  MRN_DBUG_ENTER_METHOD();
  handler::change_table_ptr(table_arg, share_arg);
  if (share && share->wrapper_mode)
  {
    wrapper_change_table_ptr(table_arg, share_arg);
  } else {
    storage_change_table_ptr(table_arg, share_arg);
  }
  DBUG_VOID_RETURN;
}

bool ha_mroonga::wrapper_is_fk_defined_on_table_or_index(uint index)
{
  MRN_DBUG_ENTER_METHOD();
  bool res;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->is_fk_defined_on_table_or_index(index);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

bool ha_mroonga::storage_is_fk_defined_on_table_or_index(uint index)
{
  MRN_DBUG_ENTER_METHOD();
  bool res = handler::is_fk_defined_on_table_or_index(index);
  DBUG_RETURN(res);
}

bool ha_mroonga::is_fk_defined_on_table_or_index(uint index)
{
  MRN_DBUG_ENTER_METHOD();
  bool res;
  if (share->wrapper_mode)
  {
    res = wrapper_is_fk_defined_on_table_or_index(index);
  } else {
    res = storage_is_fk_defined_on_table_or_index(index);
  }
  DBUG_RETURN(res);
}

char *ha_mroonga::wrapper_get_foreign_key_create_info()
{
  MRN_DBUG_ENTER_METHOD();
  char *res;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->get_foreign_key_create_info();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

#ifdef MRN_SUPPORT_FOREIGN_KEYS
char *ha_mroonga::storage_get_foreign_key_create_info()
{
  int error;
  uint i;
  grn_obj *column;
  uint n_columns = table_share->fields;
  char create_info_buff[2048], *create_info;
  String create_info_str(create_info_buff, sizeof(create_info_buff),
    system_charset_info);
  MRN_DBUG_ENTER_METHOD();
  create_info_str.length(0);
  for (i = 0; i < n_columns; ++i) {
    Field *field = table_share->field[i];

    if (!is_foreign_key_field(table_share->table_name.str,
                              field->field_name.str)) {
      continue;
    }

    mrn::ColumnName column_name(field->field_name);
    column = grn_obj_column(ctx,
                            grn_table,
                            column_name.c_str(),
                            column_name.length());
    if (!column) {
      continue;
    }
    grn_id ref_table_id = grn_obj_get_range(ctx, column);
    grn_obj *ref_table = grn_ctx_at(ctx, ref_table_id);
    char ref_table_buff[NAME_LEN + 1];
    int ref_table_name_length = grn_obj_name(ctx, ref_table, ref_table_buff,
                                             NAME_LEN);
    ref_table_buff[ref_table_name_length] = '\0';

    if (create_info_str.reserve(15)) {
      DBUG_RETURN(NULL);
    }
    create_info_str.q_append(",\n  CONSTRAINT ", 15);
    append_identifier(ha_thd(),
                      &create_info_str,
                      column_name.c_str(),
                      column_name.length());
    if (create_info_str.reserve(14)) {
      DBUG_RETURN(NULL);
    }
    create_info_str.q_append(" FOREIGN KEY (", 14);
    append_identifier(ha_thd(),
                      &create_info_str,
                      column_name.c_str(),
                      column_name.length());
    if (create_info_str.reserve(13)) {
      DBUG_RETURN(NULL);
    }
    create_info_str.q_append(") REFERENCES ", 13);
    append_identifier(ha_thd(), &create_info_str, table_share->db.str,
                      table_share->db.length);
    if (create_info_str.reserve(1)) {
      DBUG_RETURN(NULL);
    }
    create_info_str.q_append(".", 1);
    append_identifier(ha_thd(), &create_info_str, ref_table_buff,
                      ref_table_name_length);
    if (create_info_str.reserve(2)) {
      DBUG_RETURN(NULL);
    }
    create_info_str.q_append(" (", 2);

    char ref_path[FN_REFLEN + 1];
    TABLE_LIST table_list;
    TABLE_SHARE *tmp_ref_table_share;
    if (!build_table_filename(ref_path, sizeof(ref_path) - 1,
                              table_share->db.str, ref_table_buff, "", 0))
    {
      my_error(ER_WRONG_TABLE_NAME, MYF(0), ref_table_buff);
      DBUG_RETURN(NULL);
    }
    DBUG_PRINT("info", ("mroonga: ref_path=%s", ref_path));

    LEX_CSTRING table_name= { ref_table_buff, (size_t) ref_table_name_length };
    table_list.init_one_table(&table_share->db, &table_name, 0, TL_WRITE);
    mrn_open_mutex_lock(table_share);
    tmp_ref_table_share =
      mrn_create_tmp_table_share(&table_list, ref_path, &error);
    mrn_open_mutex_unlock(table_share);
    if (!tmp_ref_table_share) {
      DBUG_RETURN(NULL);
    }
    uint ref_pkey_nr = tmp_ref_table_share->primary_key;
    KEY *ref_key_info = &tmp_ref_table_share->key_info[ref_pkey_nr];
    Field *ref_field = &ref_key_info->key_part->field[0];
    append_identifier(ha_thd(), &create_info_str, ref_field->field_name.str,
                      ref_field->field_name.length);
    mrn_open_mutex_lock(table_share);
    mrn_free_tmp_table_share(tmp_ref_table_share);
    mrn_open_mutex_unlock(table_share);
    if (create_info_str.reserve(39)) {
      DBUG_RETURN(NULL);
    }
    create_info_str.q_append(") ON DELETE RESTRICT ON UPDATE RESTRICT", 39);
  }
  if (!(create_info = (char *) mrn_my_malloc(create_info_str.length() + 1,
                                             MYF(MY_WME)))) {
    DBUG_RETURN(NULL);
  }
  memcpy(create_info, create_info_str.ptr(), create_info_str.length());
  create_info[create_info_str.length()] = '\0';
  DBUG_RETURN(create_info);
}
#else
char *ha_mroonga::storage_get_foreign_key_create_info()
{
  MRN_DBUG_ENTER_METHOD();
  char *res = handler::get_foreign_key_create_info();
  DBUG_RETURN(res);
}
#endif

char *ha_mroonga::get_foreign_key_create_info()
{
  MRN_DBUG_ENTER_METHOD();
  char *res;
  if (share->wrapper_mode)
  {
    res = wrapper_get_foreign_key_create_info();
  } else {
    res = storage_get_foreign_key_create_info();
  }
  DBUG_RETURN(res);
}

#ifdef MRN_HANDLER_HAVE_GET_TABLESPACE_NAME
char *ha_mroonga::wrapper_get_tablespace_name(THD *thd, char *name,
                                              uint name_len)
{
  MRN_DBUG_ENTER_METHOD();
  char *res;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->get_tablespace_name(thd, name, name_len);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

char *ha_mroonga::storage_get_tablespace_name(THD *thd, char *name,
                                              uint name_len)
{
  MRN_DBUG_ENTER_METHOD();
  char *res = handler::get_tablespace_name(thd, name, name_len);
  DBUG_RETURN(res);
}

char *ha_mroonga::get_tablespace_name(THD *thd, char *name, uint name_len)
{
  MRN_DBUG_ENTER_METHOD();
  char *res;
  if (share->wrapper_mode)
  {
    res = wrapper_get_tablespace_name(thd, name, name_len);
  } else {
    res = storage_get_tablespace_name(thd, name, name_len);
  }
  DBUG_RETURN(res);
}
#endif

bool ha_mroonga::wrapper_can_switch_engines()
{
  MRN_DBUG_ENTER_METHOD();
  bool res;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->can_switch_engines();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

bool ha_mroonga::storage_can_switch_engines()
{
  MRN_DBUG_ENTER_METHOD();
  bool res = handler::can_switch_engines();
  DBUG_RETURN(res);
}

bool ha_mroonga::can_switch_engines()
{
  MRN_DBUG_ENTER_METHOD();
  bool res;
  if (share->wrapper_mode)
  {
    res = wrapper_can_switch_engines();
  } else {
    res = storage_can_switch_engines();
  }
  DBUG_RETURN(res);
}

int ha_mroonga::wrapper_get_foreign_key_list(THD *thd,
                                           List<FOREIGN_KEY_INFO> *f_key_list)
{
  MRN_DBUG_ENTER_METHOD();
  int res;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->get_foreign_key_list(thd, f_key_list);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

#ifdef MRN_SUPPORT_FOREIGN_KEYS
int ha_mroonga::storage_get_foreign_key_list(THD *thd,
                                             List<FOREIGN_KEY_INFO> *f_key_list)
{
  int error;
  uint i;
  grn_obj *column;
  uint n_columns = table_share->fields;
  MRN_DBUG_ENTER_METHOD();
  for (i = 0; i < n_columns; ++i) {
    Field *field = table_share->field[i];

    if (!is_foreign_key_field(table_share->table_name.str,
                              field->field_name.str)) {
      continue;
    }

    mrn::ColumnName column_name(field->field_name);
    column = grn_obj_column(ctx,
                            grn_table,
                            column_name.c_str(),
                            column_name.length());
    if (!column) {
      continue;
    }
    grn_id ref_table_id = grn_obj_get_range(ctx, column);
    grn_obj *ref_table = grn_ctx_at(ctx, ref_table_id);
    FOREIGN_KEY_INFO f_key_info;
    f_key_info.foreign_id = thd_make_lex_string(thd,
                                                NULL,
                                                column_name.c_str(),
                                                column_name.length(),
                                                TRUE);
    f_key_info.foreign_db = thd_make_lex_string(thd, NULL,
                                                table_share->db.str,
                                                table_share->db.length,
                                                TRUE);
    f_key_info.foreign_table = thd_make_lex_string(thd, NULL,
                                                   table_share->table_name.str,
                                                   table_share->table_name.length,
                                                   TRUE);
    f_key_info.referenced_db = f_key_info.foreign_db;

    char ref_table_buff[NAME_LEN + 1];
    int ref_table_name_length = grn_obj_name(ctx, ref_table, ref_table_buff,
                                             NAME_LEN);
    ref_table_buff[ref_table_name_length] = '\0';
    DBUG_PRINT("info", ("mroonga: ref_table_buff=%s", ref_table_buff));
    DBUG_PRINT("info", ("mroonga: ref_table_name_length=%d", ref_table_name_length));
    f_key_info.referenced_table = thd_make_lex_string(thd, NULL,
                                                       ref_table_buff,
                                                       ref_table_name_length,
                                                       TRUE);
    f_key_info.update_method = FK_OPTION_RESTRICT;
    f_key_info.delete_method = FK_OPTION_RESTRICT;
    f_key_info.referenced_key_name = thd_make_lex_string(thd, NULL, "PRIMARY",
                                                          7, TRUE);
    LEX_CSTRING *field_name = thd_make_lex_string(thd,
                                                 NULL,
                                                 column_name.c_str(),
                                                 column_name.length(),
                                                 TRUE);
    f_key_info.foreign_fields.push_back(field_name);

    char ref_path[FN_REFLEN + 1];
    TABLE_LIST table_list;
    TABLE_SHARE *tmp_ref_table_share;
    if (!build_table_filename(ref_path, sizeof(ref_path) - 1,
                              table_share->db.str, ref_table_buff, "", 0))
    {
      my_error(ER_WRONG_TABLE_NAME, MYF(0), ref_table_buff);
      DBUG_RETURN(false);
    }
    DBUG_PRINT("info", ("mroonga: ref_path=%s", ref_path));

    LEX_CSTRING table_name= { ref_table_buff, (size_t) ref_table_name_length };
    table_list.init_one_table(&table_share->db, &table_name, 0, TL_WRITE);
    mrn_open_mutex_lock(table_share);
    tmp_ref_table_share =
      mrn_create_tmp_table_share(&table_list, ref_path, &error);
    mrn_open_mutex_unlock(table_share);
    if (!tmp_ref_table_share) {
      DBUG_RETURN(error);
    }
    uint ref_pkey_nr = tmp_ref_table_share->primary_key;
    KEY *ref_key_info = &tmp_ref_table_share->key_info[ref_pkey_nr];
    Field *ref_field = &ref_key_info->key_part->field[0];
    LEX_CSTRING *ref_col_name = thd_make_lex_string(thd, NULL,
                                                   ref_field->field_name.str,
                                                   ref_field->field_name.length,
                                                   TRUE);
    f_key_info.referenced_fields.push_back(ref_col_name);
    mrn_open_mutex_lock(table_share);
    mrn_free_tmp_table_share(tmp_ref_table_share);
    mrn_open_mutex_unlock(table_share);
    FOREIGN_KEY_INFO *p_f_key_info =
      (FOREIGN_KEY_INFO *) thd_memdup(thd, &f_key_info,
                                      sizeof(FOREIGN_KEY_INFO));
    if (!p_f_key_info) {
      DBUG_RETURN(HA_ERR_OUT_OF_MEM);
    }
    f_key_list->push_back(p_f_key_info);
  }
  DBUG_RETURN(0);
}
#else
int ha_mroonga::storage_get_foreign_key_list(THD *thd,
                                           List<FOREIGN_KEY_INFO> *f_key_list)
{
  MRN_DBUG_ENTER_METHOD();
  int res = handler::get_foreign_key_list(thd, f_key_list);
  DBUG_RETURN(res);
}
#endif

int ha_mroonga::get_foreign_key_list(THD *thd,
                                     List<FOREIGN_KEY_INFO> *f_key_list)
{
  MRN_DBUG_ENTER_METHOD();
  int res;
  if (share->wrapper_mode)
  {
    res = wrapper_get_foreign_key_list(thd, f_key_list);
  } else {
    res = storage_get_foreign_key_list(thd, f_key_list);
  }
  DBUG_RETURN(res);
}

int ha_mroonga::wrapper_get_parent_foreign_key_list(THD *thd,
                                            List<FOREIGN_KEY_INFO> *f_key_list)
{
  MRN_DBUG_ENTER_METHOD();
  int res;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->get_parent_foreign_key_list(thd, f_key_list);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

int ha_mroonga::storage_get_parent_foreign_key_list(THD *thd,
                                            List<FOREIGN_KEY_INFO> *f_key_list)
{
  MRN_DBUG_ENTER_METHOD();
  int res = handler::get_parent_foreign_key_list(thd, f_key_list);
  DBUG_RETURN(res);
}

int ha_mroonga::get_parent_foreign_key_list(THD *thd,
                                            List<FOREIGN_KEY_INFO> *f_key_list)
{
  MRN_DBUG_ENTER_METHOD();
  int res;
  if (share->wrapper_mode)
  {
    res = wrapper_get_parent_foreign_key_list(thd, f_key_list);
  } else {
    res = storage_get_parent_foreign_key_list(thd, f_key_list);
  }
  DBUG_RETURN(res);
}

inline bool ha_mroonga::wrapper_referenced_by_foreign_key() const noexcept
{
  MRN_DBUG_ENTER_METHOD();
  bool res;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->referenced_by_foreign_key();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

inline bool ha_mroonga::storage_referenced_by_foreign_key() const noexcept
{
  MRN_DBUG_ENTER_METHOD();
  bool res = handler::referenced_by_foreign_key();
  DBUG_RETURN(res);
}

bool ha_mroonga::referenced_by_foreign_key() const noexcept
{
  MRN_DBUG_ENTER_METHOD();
  bool res;
  if (share->wrapper_mode)
  {
    res = wrapper_referenced_by_foreign_key();
  } else {
    res = storage_referenced_by_foreign_key();
  }
  DBUG_RETURN(res);
}

void ha_mroonga::wrapper_init_table_handle_for_HANDLER()
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->init_table_handle_for_HANDLER();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_init_table_handle_for_HANDLER()
{
  MRN_DBUG_ENTER_METHOD();
  handler::init_table_handle_for_HANDLER();
  DBUG_VOID_RETURN;
}

void ha_mroonga::init_table_handle_for_HANDLER()
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    wrapper_init_table_handle_for_HANDLER();
  } else {
    storage_init_table_handle_for_HANDLER();
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::wrapper_free_foreign_key_create_info(char* str)
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->free_foreign_key_create_info(str);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

#ifdef MRN_SUPPORT_FOREIGN_KEYS
void ha_mroonga::storage_free_foreign_key_create_info(char* str)
{
  MRN_DBUG_ENTER_METHOD();
  my_free(str);
  DBUG_VOID_RETURN;
}
#else
void ha_mroonga::storage_free_foreign_key_create_info(char* str)
{
  MRN_DBUG_ENTER_METHOD();
  handler::free_foreign_key_create_info(str);
  DBUG_VOID_RETURN;
}
#endif

void ha_mroonga::free_foreign_key_create_info(char* str)
{
  MRN_DBUG_ENTER_METHOD();
  if (share->wrapper_mode)
  {
    wrapper_free_foreign_key_create_info(str);
  } else {
    storage_free_foreign_key_create_info(str);
  }
  DBUG_VOID_RETURN;
}

#ifdef MRN_RBR_UPDATE_NEED_ALL_COLUMNS
bool ha_mroonga::check_written_by_row_based_binlog()
{
  MRN_DBUG_ENTER_METHOD();
  THD *thd = ha_thd();

  int current_stmt_binlog_row;
#ifdef MRN_ROW_BASED_CHECK_IS_METHOD
  current_stmt_binlog_row = thd->is_current_stmt_binlog_format_row();
#else
  current_stmt_binlog_row = thd->current_stmt_binlog_row_based;
#endif
  if (!current_stmt_binlog_row) {
    DBUG_RETURN(false);
  }

  if (table->s->tmp_table != NO_TMP_TABLE) {
    DBUG_RETURN(false);
  }

  if (!mrn_binlog_filter->db_ok(table->s->db.str)) {
    DBUG_RETURN(false);
  }

  if (!thd_test_options(thd, OPTION_BIN_LOG)) {
    DBUG_RETURN(false);
  }

  if (!mysql_bin_log.is_open()) {
    DBUG_RETURN(false);
  }

  DBUG_RETURN(true);
}
#endif

#ifdef MRN_HAVE_HA_REBIND_PSI
void ha_mroonga::wrapper_unbind_psi()
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->unbind_psi();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_unbind_psi()
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_VOID_RETURN;
}

void ha_mroonga::unbind_psi()
{
  MRN_DBUG_ENTER_METHOD();
  handler::unbind_psi();
  if (share->wrapper_mode)
  {
    wrapper_unbind_psi();
  } else {
    storage_unbind_psi();
  }
  DBUG_VOID_RETURN;
}

void ha_mroonga::wrapper_rebind()
{
  MRN_DBUG_ENTER_METHOD();
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  wrap_handler->rebind_psi();
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_VOID_RETURN;
}

void ha_mroonga::storage_rebind()
{
  MRN_DBUG_ENTER_METHOD();
  DBUG_VOID_RETURN;
}

void ha_mroonga::rebind_psi()
{
  MRN_DBUG_ENTER_METHOD();
  handler::rebind_psi();
  if (share->wrapper_mode)
  {
    wrapper_rebind();
  } else {
    storage_rebind();
  }
  DBUG_VOID_RETURN;
}
#endif

my_bool ha_mroonga::wrapper_register_query_cache_table(THD *thd,
                                                       const char *table_key,
                                                       uint key_length,
                                                       qc_engine_callback
                                                       *engine_callback,
                                                       ulonglong *engine_data)
{
  MRN_DBUG_ENTER_METHOD();
  my_bool res;
  MRN_SET_WRAP_SHARE_KEY(share, table->s);
  MRN_SET_WRAP_TABLE_KEY(this, table);
  res = wrap_handler->register_query_cache_table(thd,
                                                 table_key,
                                                 key_length,
                                                 engine_callback,
                                                 engine_data);
  MRN_SET_BASE_SHARE_KEY(share, table->s);
  MRN_SET_BASE_TABLE_KEY(this, table);
  DBUG_RETURN(res);
}

my_bool ha_mroonga::storage_register_query_cache_table(THD *thd,
                                                       const char *table_key,
                                                       uint key_length,
                                                       qc_engine_callback
                                                       *engine_callback,
                                                       ulonglong *engine_data)
{
  MRN_DBUG_ENTER_METHOD();
  my_bool res = handler::register_query_cache_table(thd,
                                                    table_key,
                                                    key_length,
                                                    engine_callback,
                                                    engine_data);
  DBUG_RETURN(res);
}

my_bool ha_mroonga::register_query_cache_table(THD *thd,
                                               const char *table_key,
                                               uint key_length,
                                               qc_engine_callback
                                               *engine_callback,
                                               ulonglong *engine_data)
{
  MRN_DBUG_ENTER_METHOD();
  my_bool res;
  if (share->wrapper_mode)
  {
    res = wrapper_register_query_cache_table(thd,
                                             table_key,
                                             key_length,
                                             engine_callback,
                                             engine_data);
  } else {
    res = storage_register_query_cache_table(thd,
                                             table_key,
                                             key_length,
                                             engine_callback,
                                             engine_data);
  }
  DBUG_RETURN(res);
}

#ifdef __cplusplus
}
#endif

namespace mrn {
  namespace variables {
    ulonglong get_boolean_mode_syntax_flags(THD *thd) {
      ulonglong flags = BOOLEAN_MODE_SYNTAX_FLAG_DEFAULT;
#ifdef MRN_SUPPORT_THDVAR_SET
      flags = THDVAR(thd, boolean_mode_syntax_flags);
#endif
      return flags;
    }

    ActionOnError get_action_on_fulltext_query_error(THD *thd) {
      ulong action = THDVAR(thd, action_on_fulltext_query_error);
      return static_cast<ActionOnError>(action);
    }
  }
}
