| From: | Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Possible solution for LIKE optimization |
| Date: | 2001-08-06 23:40:46 |
| Message-ID: | 3B6F2AFE.6CB4903@tpf.co.jp |
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| Lists: | pgsql-hackers |
Peter Eisentraut wrote:
>
> Hiroshi Inoue writes:
>
> > I'm not familiar with non_ASCII locale.
> > Is 'ss' always guaranteed to be LIKE 's%' for example ?
>
> Yes. LIKE doesn't use any collation rules, since it doesn't do any
> collating.
>
Hmm I see the description like the following in SQL99 though I
don't understand the meaning.
i) If <escape character> is not specified, then the collating
sequence used for the <like predicate> is determined by Table 3,
‘‘Collating sequence usage for comparisons’’, taking <character
match value> as comparand 1 (one) and <character pattern> as
comparand 2.
regards,
Hiroshi Inoue
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