Re: Order changes in PG16 since ICU introduction

On 6/6/23 09:09, Daniel Verite wrote:
>     Jeff Davis wrote:
>> New patch series attached. I plan to commit 0001 and 0002 soon, unless
>> there are objections.
>> 
>> 0001 causes the "C" and "POSIX" locales to be treated with
>> memcmp/pg_ascii semantics in ICU, just like in libc. We also
>> considered a new "none" provider, but it's more invasive, and we can
>> always reconsider that in the v17 cycle.

> 0001 creates exceptions throughout the code so that when an ICU
> collation has a locale name "C" or "POSIX" then it does not behave
> like an ICU collation, even though pg_collation.collprovider='i'
> To me it's neither desirable nor necessary that a collation that
> has collprovider='i' is diverted to non-ICU semantics.

This discussion makes me wonder (though probably too late for the v16 
cycle) if we shouldn't treat "C" and "POSIX" locales to be a third 
provider, something like "internal".

-- 
Joe Conway
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com