Re: Supporting non-deterministic collations with tailoring rules.

From: Peter Eisentraut <peter(at)eisentraut(dot)org>
To: Daniel Verite <daniel(at)manitou-mail(dot)org>
Cc: pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: Supporting non-deterministic collations with tailoring rules.
Date: 2026-03-19 05:57:29
Message-ID: ca558d0f-cc8f-4afa-beb5-64c8fefb5c94@eisentraut.org
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On 18.03.26 19:21, Daniel Verite wrote:
> Peter Eisentraut wrote:
>
>> Ok, committed.
>>
>> Thoughts on backpatching? Seems like a straightforward bug fix.
>
> Thanks for pushing the patch!
> I thought it was not a candidate for backpatching because it's
> a collation change.
> Now, to have a problem with that change in a minor release,
> a user would need to have an ICU collation with a rule containing
> "[strength N]", where N<>3, even though it was ineffective (so
> either the user did not notice or they did but kept it
> nonetheless). Users who reported the problem hoped for a backpatch,
> but we cannot say there is zero risk with that change in a minor
> release. Personally I'm +0.

Ok, let's not then.

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