get_relation_info_hook

Description

Hook for plugins to get control in get_relation_info()

Interface type

get_relation_info_hook_type

Header

src/include/optimizer/plancat.h

Subsystem

Query planning

Initial value

NULL (no hook installed)

C interface

typedef void (*get_relation_info_hook_type) (PlannerInfo *root, Oid relationObjectId, bool inhparent, RelOptInfo *rel);
extern PGDLLIMPORT get_relation_info_hook_type get_relation_info_hook;

Core source comments

Allow a plugin to editorialize on the info we obtained from the catalogs. Actions might include altering the assumed relation size, removing an index, or adding a hypothetical index to the indexlist.

Call sites

src/backend/optimizer/util/plancat.c:575

Core call context: src/backend/optimizer/util/plancat.c:569–583

	/*
	 * Allow a plugin to editorialize on the info we obtained from the
	 * catalogs.  Actions might include altering the assumed relation size,
	 * removing an index, or adding a hypothetical index to the indexlist.
	 */
	if (get_relation_info_hook)
		(*get_relation_info_hook) (root, relationObjectId, inhparent, rel);
}

/*
 * get_relation_foreign_keys -
 *	  Retrieves foreign key information for a given relation.
 *
 * ForeignKeyOptInfos for relevant foreign keys are created and added to
 * root->fkey_list.  We do this now while we have the relcache entry open.

Related entries

• The Planner/Optimizer

Documentation and source

• Interface declaration
• Core definition
• Call sites

Related entries

• create_upper_paths_hookcreate_upper_paths_hook
• join_search_hookjoin_search_hook
• planner_hookplanner_hook
• set_join_pathlist_hookset_join_pathlist_hook
• set_rel_pathlist_hookset_rel_pathlist_hook