Function CacheInvalidateRelcache

src/backend/utils/cache/inval.c:1374–1389

* CacheInvalidateRelcache * Register invalidation of the specified relation's relcache entry * at end of command. * * This is used in places that need to force relcache rebuild but aren't * changing any of the tuples recognized as contributors to the relcache * entry by CacheInvalidateHeapTuple. (An example is dropping an index.) */

 * entry by CacheInvalidateHeapTuple.  (An example is dropping an index.)
 */
void
CacheInvalidateRelcache(Relation relation)
{
	Oid			databaseId;
	Oid			relationId;

	PrepareInvalidationState();

	relationId = RelationGetRelid(relation);
	if (relation->rd_rel->relisshared)
		databaseId = InvalidOid;
	else
		databaseId = MyDatabaseId;

	RegisterRelcacheInvalidation(databaseId, relationId);
}

/*
 * CacheInvalidateRelcacheAll