Bruce Momjian wrote:
>
> Patch applied with adjustment --- the second part of your patch that
> skips comparing the first byte seemed unnecessary. It seemed likely
> to cause a cpu stall, so just doing the loop seemed faster.
>
> Did you test if the second part of your patch actually caused a speedup?
Well, I measured the performance today. As a result, I confirmed the
second part of my patch is unnecessary as you pointed it out.
Thanks for comment and applying patch.
> a_ogawa wrote:
> >
> > In SQL that uses 'like' operator, wchareq is used to compare characters.
> >
> > At the head of wchareq, length of (multibyte) character is compared by
> > using pg_mblen. Therefore, pg_mblen is executed many times, and it
> > becomes a bottleneck.
regards,
--- Atsushi Ogawa