Re: UTF8MatchText

I assume this replaces all your earlier multi-byte LIKE patches.

Your patch has been added to the PostgreSQL unapplied patches list at:

http://momjian.postgresql.org/cgi-bin/pgpatches

It will be applied as soon as one of the PostgreSQL committers reviews
and approves it.

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ITAGAKI Takahiro wrote:
> "Andrew - Supernews" <andrew(at)supernews(dot)net> wrote:
>
> > ITAGAKI> I think all "safe ASCII-supersets" encodings are comparable
> > ITAGAKI> by bytes, not only UTF-8.
> >
> > This is false, particularly for EUC.
>
> Umm, I see. I updated the optimization to be used only for UTF8 case.
> I also added some inlining hints that are useful on my machine (Pentium 4).
>
>
> x1000 of LIKE '%foo% on 10000 rows tables [ms]
> encoding | HEAD | P1 | P2 | P3
> -----------+-------+-------+-------+-------
> SQL_ASCII | 7094 | 7120 | 7063 | 7031
> LATIN1 | 7083 | 7130 | 7057 | 7031
> UTF8 | 17974 | 10859 | 10839 | 9682
> EUC_JP | 17032 | 17557 | 17599 | 15240
>
> - P1: UTF8MatchText()
> - P2: P1 + __inline__ GenericMatchText()
> - P3: P2 + __inline__ wchareq()
> (The attached patch is P3.)
>
> Regards,
> ---
> ITAGAKI Takahiro
> NTT Open Source Software Center
>

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Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
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