Hi,
I see on many UTF-8 customer bases expression-based index on lower(col) to fulfill some ORM implementation (lower(col) = lower(exp) or "ilike" but ilike is even more "difficult" to index so lower(col) is not so bad...) If pg 19 makes lower(utf-8_text) faster, it's definitely something I would be happy to read in a major upgrade .
Best regards,
Phil
De : Andreas Karlsson <andreas@proxel.se>
Envoyé : jeudi 30 avril 2026 09:16
À : Bruce Momjian <bruce@momjian.us>; PostgreSQL-development <pgsql-hackers@lists.postgresql.org>
Objet : Re: First draft of PG 19 release notes
On 4/30/26 9:08 AM, Andreas Karlsson wrote:
> I noticed that two of my performance patches were not included in the
> release notes and I personally think one of them belongs in the release
> notes while other not.
>
> The one I think belongs is the one below since it it really results in
> major speedups of lower(), upper(), initcap() and casefold() on ICU with
> UTF-8. Not having to convert from UTF-8 to UTF-32 and back is often a
> major speedup.
Saw the big discussion on performance improvements if they should be
included or not. So I will just leave this alone. :)
--
Andreas Karlsson
Percona
