New catalog can't drop functions with table arguments

[maxhawkins]

CREATE FUNCTION f(x INT) RETURNS TABLE (y INT) AS 'SELECT 1' LANGUAGE sql;
DROP FUNCTION f(INT);

On the experimental parser this returns relation "f" does not exist.

This is because f() has a table argument y INT that is tripping up DROP FUNCTION. The catalog needs to be updated to detect table parameters and not use them when finding a function signature.