如何从postgres函数中选择特定的列？

CREATE OR REPLACE FUNCTION get_specific_columns()
RETURNS TABLE (column1 datatype, column2 datatype, ...)
AS $$
BEGIN
    RETURN QUERY SELECT column1, column2, ... FROM your_table;
END;
$$ LANGUAGE plpgsql;

SELECT column1, column2, ...
FROM get_specific_columns();