Re: Add standard collation UNICODE

On 3/1/23 11:09, Peter Eisentraut wrote:
> The SQL standard defines several standard collations.  Most of them are
> only of legacy interest (IMO), but two are currently relevant: UNICODE
> and UCS_BASIC.  UNICODE sorts by the default Unicode collation algorithm
> specifications and UCS_BASIC sorts by codepoint.
>
> When collation support was added to PostgreSQL, we added UCS_BASIC,
> since that could easily be mapped to the C locale.  But there was no
> straightforward way to provide the UNICODE collation.  (Recall that
> collation support came several releases before ICU support.)
>
> With ICU support, we can provide the UNICODE collation, since it's just
> the root locale.  I suppose one hesitation was that ICU was not a
> standard feature, so this would create variations in the default catalog
> contents, or something like that.  But I think now that we are drifting
> to make ICU more prominent, we can just add that anyway.  I think being
> able to say
>
>     COLLATE UNICODE
>
> instead of
>
>     COLLATE "und-x-icu"
>
> or whatever it is, is pretty useful.
>
> So, attached is a small patch to add this.

I don't feel competent to review the patch (simple as it is), but +1 on
the principle.
--
Vik Fearing