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QueryOptions(mapping=None, *, ignore_unknown_fields=False, **kwargs)Query optimizer configuration.
Attributes | |
|---|---|
| Name | Description |
optimizer_version |
str
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.
|
optimizer_statistics_package |
str
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 |