strange behaviour in plpgsql:null arguments

["Peter Filipov" <pfilipov@xxxxxxxxxxx>]

Hi, I think I found something that is strange.
I can't detect whether i passed a NULL to stored procedure
in plpgsql when it happens that I use composites
I warn that I haven't read the sql standards though.
Here is the code:

CREATE TYPE ttype AS (
	t1 int,
	t2 int
);

CREATE OR REPLACE FUNCTION ttypetest(t ttype) RETURNS ttype AS $$
BEGIN
	IF t IS NULL THEN
		RAISE EXCEPTION 'NULL input';
	END IF;
	RETURN t;
END
$$ LANGUAGE plpgsql;

SELECT ttypetest(NULL);

I also find it quite difficult to unset an element from array in postgres.


Regards,
Peter Filipov