On 16/09/10 09:33, Darren Duncan wrote:
I don't know if this is a bug or not, but if not, it looks like a
misfeature ...
When executing the following in Pg 8.4.4:
CREATE OR REPLACE FUNCTION f () RETURNS TABLE(a1 INTEGER) AS
$BODY$
BEGIN
RETURN QUERY SELECT a0 AS a1 FROM rv;
RETURN;
END;
$BODY$
LANGUAGE plpgsql;
... I get this error:
ERROR: syntax error at or near "$1"
SQL state: 42601
My impression of this is that Pg is treating the "a1" after the "AS"
like it was
a variable reference and so substituted it for $1.
Now that just seems wrong to me. I can understand either "a0" or "rv"
getting a
substitution, but something following an "AS" being substituted is just
wrong.
Is that a bug and if not then what is the rationale for working that
way, and
can it be changed?
It's a known misfeature, PL/pgSQL isn't very smart about replacing
variables with parameter markers.
The good news is that this has been completely rewritten in 9.0. The
above will work in 9.0.
> Meanwhile, what is the best way to write f to work around this
misbehavior?
If you can't upgrade to 9.0, you'll have to rename the variable or use a
different alias in the AS clause.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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