OperatorShellMake(const char *operatorName,
				  Oid operatorNamespace,
				  Oid leftTypeId,
				  Oid rightTypeId)
{
	Relation	pg_operator_desc;
	Oid			operatorObjectId;
	int			i;
	HeapTuple	tup;
	Datum		values[Natts_pg_operator];
	bool		nulls[Natts_pg_operator];
	NameData	oname;
	TupleDesc	tupDesc;

	/*
	 * validate operator name
	 */
	if (!validOperatorName(operatorName))
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_NAME),
				 errmsg("\"%s\" is not a valid operator name",
						operatorName)));

	/*
	 * open pg_operator
	 */
	pg_operator_desc = table_open(OperatorRelationId, RowExclusiveLock);
	tupDesc = pg_operator_desc->rd_att;

	/*
	 * initialize our *nulls and *values arrays
	 */
	for (i = 0; i < Natts_pg_operator; ++i)
	{
		nulls[i] = false;
		values[i] = (Datum) NULL;	/* redundant, but safe */
	}

	/*
	 * initialize values[] with the operator name and input data types. Note
	 * that oprcode is set to InvalidOid, indicating it's a shell.
	 */
	operatorObjectId = GetNewOidWithIndex(pg_operator_desc, OperatorOidIndexId,
										  Anum_pg_operator_oid);
	values[Anum_pg_operator_oid - 1] = ObjectIdGetDatum(operatorObjectId);
	namestrcpy(&oname, operatorName);
	values[Anum_pg_operator_oprname - 1] = NameGetDatum(&oname);
	values[Anum_pg_operator_oprnamespace - 1] = ObjectIdGetDatum(operatorNamespace);
	values[Anum_pg_operator_oprowner - 1] = ObjectIdGetDatum(GetUserId());
	values[Anum_pg_operator_oprkind - 1] = CharGetDatum(leftTypeId ? (rightTypeId ? 'b' : 'r') : 'l');
	values[Anum_pg_operator_oprcanmerge - 1] = BoolGetDatum(false);
	values[Anum_pg_operator_oprcanhash - 1] = BoolGetDatum(false);
	values[Anum_pg_operator_oprleft - 1] = ObjectIdGetDatum(leftTypeId);
	values[Anum_pg_operator_oprright - 1] = ObjectIdGetDatum(rightTypeId);
	values[Anum_pg_operator_oprresult - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprcom - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprnegate - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprcode - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprrest - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprjoin - 1] = ObjectIdGetDatum(InvalidOid);

	/*
	 * create a new operator tuple
	 */
	tup = heap_form_tuple(tupDesc, values, nulls);

	/*
	 * insert our "shell" operator tuple
	 */
	CatalogTupleInsert(pg_operator_desc, tup);

	/* Add dependencies for the entry */
	makeOperatorDependencies(tup, false);

	heap_freetuple(tup);

	/* Post creation hook for new shell operator */
	InvokeObjectPostCreateHook(OperatorRelationId, operatorObjectId, 0);

	/*
	 * Make sure the tuple is visible for subsequent lookups/updates.
	 */
	CommandCounterIncrement();

	/*
	 * close the operator relation and return the oid.
	 */
	table_close(pg_operator_desc, RowExclusiveLock);

	return operatorObjectId;
}
OperatorShellMake(const char *operatorName,
				  Oid operatorNamespace,
				  Oid leftTypeId,
				  Oid rightTypeId)
{
	Relation	pg_operator_desc;
	Oid			operatorObjectId;
	int			i;
	HeapTuple	tup;
	Datum		values[Natts_pg_operator];
	bool		nulls[Natts_pg_operator];
	NameData	oname;
	TupleDesc	tupDesc;

	 
	if (!validOperatorName(operatorName))
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_NAME),
				 errmsg("\"%s\" is not a valid operator name",
						operatorName)));

	 
	pg_operator_desc = table_open(OperatorRelationId, RowExclusiveLock);
	tupDesc = pg_operator_desc->rd_att;

	 
	for (i = 0; i < Natts_pg_operator; ++i)
	{
		nulls[i] = false;
		values[i] = (Datum) NULL;	 
	}

	 
	operatorObjectId = GetNewOidWithIndex(pg_operator_desc, OperatorOidIndexId,
										  Anum_pg_operator_oid);
	values[Anum_pg_operator_oid - 1] = ObjectIdGetDatum(operatorObjectId);
	namestrcpy(&oname, operatorName);
	values[Anum_pg_operator_oprname - 1] = NameGetDatum(&oname);
	values[Anum_pg_operator_oprnamespace - 1] = ObjectIdGetDatum(operatorNamespace);
	values[Anum_pg_operator_oprowner - 1] = ObjectIdGetDatum(GetUserId());
	values[Anum_pg_operator_oprkind - 1] = CharGetDatum(leftTypeId ? (rightTypeId ? 'b' : 'r') : 'l');
	values[Anum_pg_operator_oprcanmerge - 1] = BoolGetDatum(false);
	values[Anum_pg_operator_oprcanhash - 1] = BoolGetDatum(false);
	values[Anum_pg_operator_oprleft - 1] = ObjectIdGetDatum(leftTypeId);
	values[Anum_pg_operator_oprright - 1] = ObjectIdGetDatum(rightTypeId);
	values[Anum_pg_operator_oprresult - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprcom - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprnegate - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprcode - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprrest - 1] = ObjectIdGetDatum(InvalidOid);
	values[Anum_pg_operator_oprjoin - 1] = ObjectIdGetDatum(InvalidOid);

	 
	tup = heap_form_tuple(tupDesc, values, nulls);

	 
	CatalogTupleInsert(pg_operator_desc, tup);

	 
	makeOperatorDependencies(tup, false);

	heap_freetuple(tup);

	 
	InvokeObjectPostCreateHook(OperatorRelationId, operatorObjectId, 0);

	 
	CommandCounterIncrement();

	 
	table_close(pg_operator_desc, RowExclusiveLock);

	return operatorObjectId;
}