Re: Order changes in PG16 since ICU introduction

On 21.04.23 19:09, Sandro Santilli wrote:
> On Fri, Apr 21, 2023 at 11:48:51AM -0400, Tom Lane wrote:
>> "Regina Obe" <lr(at)pcorp(dot)us> 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