class Google::Apis::SpannerV1::QueryOptions
Query optimizer configuration.
Attributes
An option to control the selection of optimizer statistics package. This parameter allows individual queries to use a different query optimizer statistics package. Specifying `latest` as a value instructs Cloud Spanner to use the latest generated statistics package. If not specified, Cloud Spanner uses the statistics package set at the database level options, or the latest package if the database option is not set. The statistics package requested by the query has to be exempt from garbage collection. This can be achieved with the following DDL statement: “` ALTER STATISTICS SET OPTIONS (allow_gc=false) “` The list of available statistics packages can be queried from ` INFORMATION_SCHEMA.SPANNER_STATISTICS`. Executing a SQL statement with an invalid optimizer statistics package or with a statistics package that allows garbage collection fails with an `INVALID_ARGUMENT` error. Corresponds to the JSON property `optimizerStatisticsPackage` @return [String]
An option to control the selection of optimizer version. This parameter allows individual queries to pick different query optimizer versions. Specifying ` latest` as a value instructs Cloud Spanner to use the latest supported query optimizer version. If not specified, Cloud Spanner uses the optimizer version set at the database level options. Any other positive integer (from the list of supported optimizer versions) overrides the default optimizer version for query execution. The list of supported optimizer versions can be queried from SPANNER_SYS.SUPPORTED_OPTIMIZER_VERSIONS. Executing a SQL statement with an invalid optimizer version fails with an `INVALID_ARGUMENT` error. See https:// cloud.google.com/spanner/docs/query-optimizer/manage-query-optimizer for more information on managing the query optimizer. The `optimizer_version` statement hint has precedence over this setting. Corresponds to the JSON property `optimizerVersion` @return [String]
Public Class Methods
# File lib/google/apis/spanner_v1/classes.rb, line 3085 def initialize(**args) update!(**args) end
Public Instance Methods
Update properties of this object
# File lib/google/apis/spanner_v1/classes.rb, line 3090 def update!(**args) @optimizer_statistics_package = args[:optimizer_statistics_package] if args.key?(:optimizer_statistics_package) @optimizer_version = args[:optimizer_version] if args.key?(:optimizer_version) end