Function get_commutator

src/backend/utils/cache/lsyscache.c:1652–1669

* get_commutator * * Returns the corresponding commutator of an operator. */

 *		Returns the corresponding commutator of an operator.
 */
Oid
get_commutator(Oid opno)
{
	HeapTuple	tp;

	tp = SearchSysCache1(OPEROID, ObjectIdGetDatum(opno));
	if (HeapTupleIsValid(tp))
	{
		Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
		Oid			result;

		result = optup->oprcom;
		ReleaseSysCache(tp);
		return result;
	}
	else
		return InvalidOid;
}

/*
 * get_negator