From: | "Hiroshi Inoue" <Inoue(at)tpf(dot)co(dot)jp> |
---|---|
To: | "Peter Eisentraut" <peter_e(at)gmx(dot)net> |
Cc: | "PostgreSQL Development" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | RE: Progress report on locale safe LIKE indexing |
Date: | 2001-08-18 21:53:06 |
Message-ID: | EKEJJICOHDIEMGPNIFIJOEJHFCAA.Inoue@tpf.co.jp |
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> -----Original Message-----
> From: Peter Eisentraut [mailto:peter_e(at)gmx(dot)net]
>
> Hiroshi Inoue writes:
>
> > Isn't 'a' LIKE 'A' if 'a' = 'A' ?
>
> Yes. But 'a' <> 'A'.
Please look at my first question.
This depends on the assumption that '=' is equivalent in
any locale. Is it guaranteed ?
For example, ( 'a' = 'A' ) isn't allowed in any locale ?.
And your answer was
The whole point here is not to rely on '='.
Clearly your theory depends on the assumption that
If a = b in some locale then a = b in ASCII locale.
And where does 'a' <> 'A' come from ?
The definition of '=' is a part of collating sequence.
>
> > LIKE seems to use the collating sequence.
>
> No. The collating sequence defines the order of all possible strings.
> LIKE doesn't order anything.
Again where does it come from ?
regards,
Hiroshi Inoue
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