Re: Add CASEFOLD() function.

On Thu, 19 Jun 2025 at 15:51, Peter Eisentraut <peter@eisentraut.org> wrote:
>
> On 19.06.25 06:03, Thom Brown wrote:
> > Late to the party, but is there an argument for porting this to the
> > citext type? Or supplementing the extension with an additional type
> > ("cftext"? *shrug*). It currently uses lower(), so our current
> > recommendation for dealing with all unicode characters is to use
> > nondeterministic collations.
>
> What is the motivation for wanting a citext variant instead of using
> nondeterministic collations?

Ease of use, perhaps. It seems easier to use:

column_name cftext

rather than:

CREATE COLLATION case_insensitive_collation (
    PROVIDER = icu,
    LOCALE = 'und-u-ks-level2',
    DETERMINISTIC = FALSE
);

column_name text COLLATE case_insensitive_collation

But I see the arguments against it. It creates an unnecessary
dependency on an extension, and if someone wants to ignore both case
and accents, they may resort to using 2 extensions (citext + unaccent)
when none are needed. I guess I don't feel strongly about it either
way.

Thom