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Date: Tue, 21 May 2024 12:38:51 +0200
From: hubert depesz lubaczewski <depesz@depesz.com>
Sender: depesz@depesz.com
To: David Rowley <dgrowleyml@gmail.com>
Cc: pgsql-bugs mailing list <pgsql-bugs@postgresql.org>
Subject: Re: UNION removes almost all rows (not duplicates) - in fresh build
 of pg17!
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On Tue, May 21, 2024 at 09:54:25AM +1200, David Rowley wrote:
> Thanks for the report.
> It looks like it's a very simple fix.  The problem is I wasn't setting
> groupList when the grouping_is_sortable() returned false.  In the
> prior version, make_union_unique() always set that.
> The attached should apply cleanly up to d2a04470a.

Hi,
tested, and can confirm that applying this patch on top of
d2a04470aa6401c1938cc107e0b2c56c22a2321f solved the problem.

Best regards,

depesz