Function get_opcode

src/backend/utils/cache/lsyscache.c:1428–1445

* get_opcode * * Returns the regproc id of the routine used to implement an * operator given the operator oid. */

 *		operator given the operator oid.
 */
RegProcedure
get_opcode(Oid opno)
{
	HeapTuple	tp;

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

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

/*
 * get_opname