Re: Fix RETURNING side effects for FOR PORTION OF leftover rows

From: Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>
To: Paul A Jungwirth <pj(at)illuminatedcomputing(dot)com>
Cc: Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Peter Eisentraut <peter(at)eisentraut(dot)org>
Subject: Re: Fix RETURNING side effects for FOR PORTION OF leftover rows
Date: 2026-07-27 01:49:00
Message-ID: 98BE8A0B-F678-4EDE-8EEB-096C0FB0582B@gmail.com
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> On Jul 26, 2026, at 03:30, Paul A Jungwirth <pj(at)illuminatedcomputing(dot)com> wrote:
>
> On Sat, Jul 25, 2026 at 3:16 AM Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> wrote:
>>
>> The fix looks good to me, and the point about cross-partition updates
>> is a good one.
>>
>> Attached is a v3 patch, in which I reworked the comments a bit, and
>> moved the logic of the new check to the place it's actually used. I
>> also changed the tests to use a NOTICE-raising function instead of a
>> sequence, since that makes it clearer which rows are/were being
>> processed by the RETURNING clause.
>
> This all seems good. Using NOTICE does seem a little nicer.
>
> The commit message has a small typo:
>
> . . . so that the auxiliary INSERT of a
> cross-partition UPDATE with a FOR PORTION OF clause still process
> <-- s/b processes
> RETURNING normally.

+1

Otherwise, v2 looks good to me.

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/

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