Re: Skip a redundant singleton GROUP BY node

From: David Rowley <dgrowleyml(at)gmail(dot)com>
To: zengxx <xiangxin_zeng(at)qq(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "chenhuimo(dot)mch" <chenhuimo(dot)mch(at)qq(dot)com>
Subject: Re: Skip a redundant singleton GROUP BY node
Date: 2026-10-09 01:02:34
Message-ID: CAApHDvr+MyDaborAxz=EauZXQTnMM3V7MDBHnrHa-2q_WQd++Q@mail.gmail.com
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On Fri, 9 Oct 2026 at 13:49, zengxx <xiangxin_zeng(at)qq(dot)com> wrote:
> The proof is still intentionally narrow.

There is a much more sophisticated patch that can do what you're
proposing here plus lots more in [1]. I suggest you abandon this patch
in favour of reviewing that one.

David.

[1] https://commitfest.postgresql.org/patch/7045/

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