Function RelationGetPrimaryKeyIndex

src/backend/utils/cache/relcache.c:5130–5144

* RelationGetPrimaryKeyIndex -- get OID of the relation's primary key index * * Returns InvalidOid if there is no such index. */

 * Returns InvalidOid if there is no such index.
 */
Oid
RelationGetPrimaryKeyIndex(Relation relation)
{
	List	   *ilist;

	if (!relation->rd_indexvalid)
	{
		/* RelationGetIndexList does the heavy lifting. */
		ilist = RelationGetIndexList(relation);
		list_free(ilist);
		Assert(relation->rd_indexvalid);
	}

	return relation->rd_pkindex;
}

/*
 * RelationGetReplicaIndex -- get OID of the relation's replica identity index