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@supernews.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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