PostgreSQL create UUID max aggregate function

gistfile1.txt

CREATE OR REPLACE FUNCTION max (uuid, uuid)
RETURNS uuid AS $$
BEGIN
	IF $1 IS NULL OR $1 < $2 THEN
		RETURN $2;
	END IF;

	RETURN $1;
END;
$$ LANGUAGE plpgsql;


CREATE AGGREGATE max (uuid)
(
    sfunc = max,
    stype = uuid
);

Awesome, thanks!