Horton

Re: [18] Policy on IMMUTABLE functions and Unicode updates

Jeff Davis <pgsql@j-davis.com>

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From: Jeff Davis <pgsql@j-davis.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>, Jeremy Schneider <schneider@ardentperf.com>, Laurenz Albe <laurenz.albe@cybertec.at>, Daniel Verite <daniel@manitou-mail.org>, Noah Misch <noah@leadboat.com>, Peter Eisentraut <peter@eisentraut.org>, pgsql-hackers@postgresql.org
Date: 2024-07-23T20:43:18Z
Lists: pgsql-hackers 
On Tue, 2024-07-23 at 16:07 -0400, Tom Lane wrote:
> Well, it depends on which libc collation you have in mind.  I was
> thinking of a libc-supplied C.UTF-8 collation, which I would expect
> to behave the same as pg_c_utf8, modulo which Unicode version it's
> based on.

Daniel Vérité documented[1] cases where the libc C.UTF-8 locale changed
the *sort* behavior, thereby affecting primary keys.

Regards,
	Jeff Davis

[1]
https://www.postgresql.org/message-id/8a3dc06f-9b9d-4ed7-9a12-2070d8b0165f%40manitou-mail.org