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Subject: Re: PATCH: jsonpath string methods: lower, upper, initcap, l/r/btrim,
 replace, split_part
From: Florents Tselai <florents.tselai@gmail.com>
In-Reply-To: <7e9debe6-4e96-4b0d-a801-b531e962ef43@eisentraut.org>
Date: Fri, 23 May 2025 20:06:25 +0300
Cc: Robert Haas <robertmhaas@gmail.com>,
 Alexander Korotkov <aekorotkov@gmail.com>,
 Tom Lane <tgl@sss.pgh.pa.us>,
 pgsql-hackers <pgsql-hackers@lists.postgresql.org>,
 Andrew Dunstan <andrew@dunslane.net>
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To: Peter Eisentraut <peter@eisentraut.org>
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> On 22 May 2025, at 11:56=E2=80=AFPM, Peter Eisentraut =
<peter@eisentraut.org> wrote:
>=20
> On 09.05.25 21:50, Robert Haas wrote:
>> I always struggle a bit to remember our policy on these issues -- to
>> the best of my knowledge, we haven't documented it anywhere, and I
>> think we probably should. I believe the way it works is that whenever
>> a function depends on the operating system's timestamp or locale
>> definitions, we decide it has to be stable, not immutable. We don't
>> expect those things to be updated very often, but we know sometimes
>> they do get updated.
>=20
> I don't understand how this discussion got to the conclusion that =
functions that depend on the locale cannot be immutable.  Note that the =
top-level functions lower, upper, and initcap themselves are immutable.

I assume you mean that they=E2=80=99re set at initdb time, so there=E2=80=99=
s no mutability concern?=20