pgsql: Ensure all pg_locale.h APIs work with collate_is_c.

From: Jeff Davis <jdavis(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Ensure all pg_locale.h APIs work with collate_is_c.
Date: 2026-08-20 16:41:25
Message-ID: E1wx5pU-00000001Ns3-2TpO@gemulon.postgresql.org
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Ensure all pg_locale.h APIs work with collate_is_c.

Safer for callers, so that checking collate_is_c is only needed if the
caller wants to optimize for that case.

Backpatch to avoid creating a hazard for other backpatches in this
area.

Suggested-by: Andres Freund <andres(at)anarazel(dot)de>
Suggested-by: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
Discussion: https://postgr.es/m/v36ssaygf7grb3qzfsjhtdzi7kqd45ds56nyuf7gi5qjml4qbb@ezmfqzmhlrs2
Backpatch-through: 18

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/47c350c522e3c6624d03cbe7630c167302926881

Modified Files
--------------
src/backend/utils/adt/pg_locale.c | 64 +++++++++++++++++++++++++++++++++++----
1 file changed, 58 insertions(+), 6 deletions(-)

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