Tom wrote:
>
> > Someone changed the parser to build a TypeName node on CREATE
> > FUNCTION in any case. As a side effect, ALL! functions
> > created got the proretset attribute to true. Thus for a
> > SELECT the parser wrapped an Iter node around the Expr and
> > since singleton functions set isDone the Iter returns no
> > tuple up.
>
> Ah. I broke it (though the regression tests did not find the problem). What
> I changed was the code in gram.y, which used to just create a string node
> for the return type clause _unless_ the return type was a "SETOF type". In
> that case a Typename node was created, and the setof attribute was
> explicitly set.
>
> What you found is that farther along, the setof attribute was forced to be
> true if _any_ Typename node is present.
Haven't spend time to analyze if other places might have been
affected by that - just thought we should trust the parser
about the SETOF flag in TypeName node instead of knowing it
better deep down in the utility commands.
;-)
>
> It looks like your patch will completely fix things, and is better than my
> reverting the gram.y code. Can you suggest a small test case to include in
> the regression suite?
Small test case - hmmm.
The regression tests found it - but you wouldn't expect it
there. It's in the trigger test, where at some places SELECT
set_ttdummy(0) returns 0 columns instead of one.
Anyway - add a little function in regress.c returning a
basetype value. Then add tests that use it in SELECT queries.
int32
allways_one()
{
return 1;
}
SELECT allways_one() AS one;
SELECT a, allways_one() AS one FROM t;
>
> Unless there are objections from others (with a preference for reverting
> the gram.y code) I'll go ahead and apply Jan's patch.
Even if reverting the gram.y code - my patch could only make
things better.
Until later, Jan
--
#======================================================================#
# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me. #
#======================================== jwieck@debis.com (Jan Wieck) #
