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From: Peter Eisentraut <[email protected]>
To: Robert Haas <[email protected]>
To: Florents Tselai <[email protected]>
Cc: Alexander Korotkov <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: pgsql-hackers <[email protected]>
Cc: Andrew Dunstan <[email protected]>
Subject: Re: PATCH: jsonpath string methods: lower, upper, initcap, l/r/btrim, replace, split_part
Date: Thu, 22 May 2025 22:56:25 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA+Tgmob03B6h1SMsi7vs9uOX+vrqg_tyhh--mKC3BaTJ08qKYA@mail.gmail.com>
References: <CA+v5N40sJF39m0v7h=QN86zGp0CUf9F1WKasnZy9nNVj_VhCZQ@mail.gmail.com>
	<[email protected]>
	<CAPpHfdtGhn_5jfLoepOScyqT+FXYB9QtV-OEprychDcMJco7mw@mail.gmail.com>
	<CA+v5N42PVJH3HbwLE1yC75XR6E5zGnCCdtSUXfgFwtGyPP8XYg@mail.gmail.com>
	<CA+Tgmob03B6h1SMsi7vs9uOX+vrqg_tyhh--mKC3BaTJ08qKYA@mail.gmail.com>

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.

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.

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