order by when using cursors

Hi!

I  did some experiments with cursors and found that my data doesn't get
sorted by the "order by"-statement.

Here is what I did:

----------------

CREATE TABLE ta (
  a integer NOT NULL,
  b integer NOT NULL
);

insert into ta values(3,1);
insert into ta values(1,2);
insert into ta values(4,3);
insert into ta values(2,4);

CREATE OR REPLACE FUNCTION testcur( OUT a integer, OUT b integer )
RETURNS SETOF RECORD AS $$
DECLARE
	cur refcursor;
BEGIN
	OPEN cur FOR SELECT * FROM ta ORDER BY a DESC;
	LOOP
		FETCH cur INTO a,b;
		IF not found THEN
			exit;
		ELSE
			RETURN NEXT;
		END IF;
	END LOOP;
	CLOSE cur;
END;
$$ LANGUAGE 'PLPGSQL' ;

SELECT * FROM testcur();

----------------

As the result I get:

3	1
1	2
4	3
2	4


Which is not ordered by column a!?

Is this intended?
Am I doing something wrong?

I'm using Postgresql 8.3.1

Patrick


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