RE: Progress report on locale safe LIKE indexing

> -----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