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Re: [BUG] false positive in bt_index_check in case of short 4B varlena datum

Michael Paquier <michael@paquier.xyz>

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From: Michael Paquier <michael@paquier.xyz>
To: Andrey Borodin <x4mmm@yandex-team.ru>
Cc: Alexander Korotkov <aekorotkov@gmail.com>, Andres Freund <andres@anarazel.de>, Alexander Lakhin <exclusion@gmail.com>, Michael Zhilin <m.zhilin@postgrespro.ru>, pgsql-bugs@postgresql.org, Yura Sokolov <y.sokolov@postgrespro.ru>
Date: 2026-05-08T23:07:06Z
Lists: pgsql-bugs 
On Mon, May 04, 2026 at 10:20:04AM +0500, Andrey Borodin wrote:
> However, I'd like to note that (VARSIZE_1B() < TOAST_INDEX_TARGET) is
> constantly true for 8Kb+ pages.

How much slower?  I cannot imagine that it matters much in this code
path, but you are getting me worried.
--
Michael

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. amcheck: Use correct varlena size accessor in bt_normalize_tuple()