GS_SPM_EVOLUTION

GS_SPM_EVOLUTION is a system catalog used to store plan evolution result. Users with sysadmin permissions can read the system catalog, but only initial users can write the system catalog.

**Table 1** GS_SPM_EVOLTOIN columns
Name	Type	Description
sql_namespace	oid	Schema OID.
sql_hash	bigint	Unique ID of the SQL statement in the SPM.
plan_hash	bigint	Plan ID.
better	Boolean	Determines whether it is a positive evolution. t indicates positive evolution. f indicates negative evolution.
refer_plan	bigint	Plan hash used as a reference for report generation.
status	integer	Determines whether exceptions occur during the evolution. The value 0 indicates that no exception occurs. The value 1 indicates that an exception occurs.
reason	text	Content of the evolution report.
user	oid	User who generates the evolution result.
creation_time	timestamp with time zone	Time when the evolution result is created.