alter table tablename add column - breaks pl/pgsql function returns tablename

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Hi!

This is an old problem, referred to in bug #4907:

CREATE TABLE test(id INTEGER);
INSERT INTO test VALUES (1);

CREATE OR REPLACE FUNCTION test_func() returns SETOF test as $$
DECLARE
res_ test;
BEGIN
FOR res_ IN SELECT * FROM test LOOP
RETURN NEXT res_;
END LOOP;
END
$$ LANGUAGE 'plpgsql';

SELECT * FROM test_func();
ALTER TABLE test ADD COLUMN foo INTEGER;
SELECT * FROM test_func();
- -- ERROR: wrong record type supplied in RETURN NEXT

You have to run create or replace again to fix it when changing the
schema. How come it fails? Is the return type "hardcoded" when the
function is created? Is this very hard to fix? IS there a suggested
work-around?

It seems to work to change to a generic "record", but that is also more
sloppy as it is not as well typed.

Thoughts?

Palle

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