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From: Peter Eisentraut <[email protected]>
To: Sandro Santilli <[email protected]>
To: Tom Lane <[email protected]>
Cc: Regina Obe <[email protected]>
Cc: [email protected]
Cc: Jeff Davis <[email protected]>
Subject: Re: Order changes in PG16 since ICU introduction
Date: Fri, 21 Apr 2023 19:14:13 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

On 21.04.23 19:09, Sandro Santilli wrote:
> On Fri, Apr 21, 2023 at 11:48:51AM -0400, Tom Lane wrote:
>> "Regina Obe" <[email protected]> writes:
>>
>>> https://trac.osgeo.org/postgis/ticket/5375
>>
>> If they actually are using locale C, I would say this is a bug.
>> That should designate memcmp sorting and nothing else.
> 
> Sounds like a bug to me. This is happening with a PostgreSQL cluster
> created and served by a build of commit c04c6c5d6f :
> 
>    =# select version();
>    PostgreSQL 16devel on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0, 64-bit
>    =# show lc_collate;
>    C
>    =# select '+' < '-';
>    f

If the database is created with locale provider ICU, then lc_collate 
does not apply here, so the result might be correct (depending on what 
locale you have set).

>    =# select '+' < '-' collate "C";
>    t

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