Problem on function returning setof custom type

This happens when using left join on the select.
This is a sample of what is happening to me.

-- The tables

CREATE TABLE test
(
id numeric,
blow varchar
) WITHOUT OIDS;

CREATE TABLE test1
(
id numeric,
bla2 varchar
) WITHOUT OIDS;

COPY test (id, blow) FROM stdin;
1 sdasd
2 sdaddxxsd
4 s55ff
\.

COPY test1 (id, bla2) FROM stdin;
1 dddd
\.

--the custom type:

CREATE TABLE test1
(
id numeric,
bla2 varchar
) WITHOUT OIDS;

-- the function:

CREATE OR REPLACE FUNCTION vv(varchar)
RETURNS SETOF custom AS
'

DECLARE
rec custom%ROWTYPE;
BEGIN
FOR rec IN SELECT test.id <http://test.id>, test.blow, test1.bla2
FROM test
LEFT JOIN test1 ON test.id <http://test.id> = test1.id <http://test1.id>WHERE
test1.bla2=\'$1\' LOOP
RETURN NEXT rec;
END LOOP;

RETURN null;
END;
'
LANGUAGE 'plpgsql' VOLATILE;

-- the results:
select * from vv ('dddd');
-- returns empty set

-- while the actual sql query:
SELECT test.id <http://test.id>, test.blow, test1.bla2
FROM test
LEFT JOIN test1 ON test.id <http://test.id> = test1.id <http://test1.id>WHERE
test1.bla2='dddd';
-- returns
--id|blow|bla2
--1|sdasd|dddd

Thanks for the help!

--
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