如何在DB2模块中创建返回表的自定义函数？

CREATE FUNCTION myCustomFunction(param1 INT, param2 VARCHAR(50))
RETURNS TABLE (col1 INT, col2 VARCHAR(50))

BEGIN
    DECLARE cursor1 CURSOR WITH RETURN FOR
        SELECT column1, column2 FROM myTable WHERE condition;
    OPEN cursor1;
END

RETURN;

END

CREATE FUNCTION myCustomFunction(param1 INT, param2 VARCHAR(50))
RETURNS TABLE (col1 INT, col2 VARCHAR(50))
BEGIN
    DECLARE cursor1 CURSOR WITH RETURN FOR
        SELECT column1, column2 FROM myTable WHERE condition;
    OPEN cursor1;
    RETURN;
END