On Fri, 2024-12-20 at 06:20 +0100, Andreas Karlsson wrote:
> SELECT count(upper) FROM (SELECT upper(('Kålhuvud ' || i) COLLATE
> "sv-SE-x-icu") FROM generate_series(1, 1000000) i);
>
> master: ~540 ms
> Patched: ~460 ms
> glibc: ~410 ms
It looks like you are opening and closing the UCaseMap object each
time. Why not save it in pg_locale_t? That should speed it up even more
and hopefully beat libc.
Also, to support older ICU versions consistently, we need to fix up the
locale name to support "und"; cf. pg_ucol_open(). Perhaps factor out
that logic?
Regards,
Jeff Davis
