Re: Online PostgreSQL version() updates

From: Andrey Borodin <x4mmm(at)yandex-team(dot)ru>
To: Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Online PostgreSQL version() updates
Date: 2026-04-01 12:01:51
Message-ID: 9A9D654D-A666-4943-B1FC-1E086AAC68C0@yandex-team.ru
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> On 1 Apr 2026, at 15:48, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com> wrote:
>
> Attached is a patch that allows superusers to update the version() of
> their running system with a simple SQL call: SELECT
> pg_update_version(version_num, 'version_short', 'the full version()
> outout')

While I find this proposal very useful, I think the interface can be improved.

Consider SELECT pg_update_version(commit_hash) so we can do stuff like
SELECT pg_update_version('REL_18_2') or SELECT pg_update_version('HEAD~10000').
In future we can even create a bisect facility, so when user encounters a bug in their production they can iterate over several commits to trace root cause.

Best regards, Andrey Borodin.

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