Re: [18] Policy on IMMUTABLE functions and Unicode updates

On Wed, Jul 24, 2024 at 1:45 PM Jeff Davis <pgsql@j-davis.com> wrote:
> There's a qualitative difference between a collation update which can
> break your PKs and FKs, and a ctype update which definitely will not.

I don't think that's true. All you need is a unique index on UPPER(somecol).

--
Robert Haas
EDB: http://www.enterprisedb.com