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From: David Christensen <david@pgguru.net>
Date: Fri, 26 Sep 2025 11:13:04 -0500
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 <CAHM0NXgPhe_OF81MyA9ocWZ=b+oEAHtQHoDXw4DverPdbkXzpg@mail.gmail.com>
Subject: Re: [PATCH] GROUP BY ALL
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Andrey Borodin <x4mmm@yandex-team.ru>,
 Peter Eisentraut <peter@eisentraut.org>,
	pgsql-hackers <pgsql-hackers@postgresql.org>,
	"David G. Johnston" <david.g.johnston@gmail.com>,
 Jelte Fennema-Nio <postgres@jeltef.nl>
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On Fri, Sep 26, 2025 at 11:05=E2=80=AFAM Tom Lane <tgl@sss.pgh.pa.us> wrote=
:
>
> David Christensen <david@pgguru.net> writes:
> > Here is a rebased version with a few more tests.  I also changed the
> > main check here to using `!contain_agg_clause` instead of
> > `!IsA(Aggref))` directly.  (This was defined in `optimizer/clauses.h`,
> > but we already are pulling in `optimizer.h`, so it felt valid to me.)
>
> contain_agg_clause will blow up on a SubLink, so I doubt this is
> gonna be robust.

Fair enough, see that Assert now; easy enough to make a new
expression_tree_walker that only looks for Aggref and short-circuits
SubLink (which I assume is the right behavior here, but might have to
add some more tests/play around with subqueries in the GROUP BY ALL
part).

David