| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Per-column collation, proof of concept |
| Date: | 2010-07-15 08:44:26 |
| Message-ID: | 1279183466.28822.11.camel@fsopti579.F-Secure.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On tor, 2010-07-15 at 05:57 +0200, Pavel Stehule wrote:
> :( maybe we have to enhance a locales - or do some work in this way.
> In Czech's IS is relative often operation some like
>
> name = 'Stěhule' COLLATION cs_CZ_cs_ai -- compare case insensitive
> accent insensitive
>
> PostgreSQL is last db, that doesn't integreated support for it
Well, the comparison function varstr_cmp() contains this comment:
/*
* In some locales strcoll() can claim that nonidentical strings are
* equal. Believing that would be bad news for a number of reasons,
* so we follow Perl's lead and sort "equal" strings according to
* strcmp().
*/
This might not be strictly necessary, seeing that citext obviously
doesn't work that way, but resolving this is really an orthogonal issue.
If you fix that and you have a locale that does what you want, my patch
will help you get your example working.
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