Re: Allow tailoring of ICU locales with custom rules

Patch needed a rebase; no functionality changes.

On 14.12.22 10:26, Peter Eisentraut wrote:
> This patch exposes the ICU facility to add custom collation rules to a
> standard collation.  This would allow users to customize any ICU
> collation to whatever they want.  A very simple example from the
> documentation/tests:
>
> CREATE COLLATION en_custom
>     (provider = icu, locale = 'en', rules = '&a < g');
>
> This places "g" after "a" before "b".  Details about the syntax can be
> found at
> <https://unicode-org.github.io/icu/userguide/collation/customization/>.
>
> The code is pretty straightforward.  It mainly just records these rules
> in the catalog and feeds them to ICU when creating the collator object.