Re: Request: set opclass for generated unique and primary key indexes

From: "Pavel Stehule" <pavel(dot)stehule(at)hotmail(dot)com>
To: sszabo(at)megazone(dot)bigpanda(dot)com
Cc: tgl(at)sss(dot)pgh(dot)pa(dot)us, pvasickova(at)hotmail(dot)com, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Request: set opclass for generated unique and primary key indexes
Date: 2006-02-22 22:53:54
Message-ID: BAY20-F2301E6373A90AE863D1E56F9FD0@phx.gbl
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> > >I seem to recall someone proposing extending the syntax of the UNIQUE
> > >constraints themselves, but there really isn't enough use-case to
> > >justify it AFAICS. Especially not when you can always use CREATE
>UNIQUE
> > >INDEX.
> >
> > I can always use second unique index. But it's redundant. This problem
>is
> > related to using nonC locale.
>
>Why do you need both the unique index with varchar_pattern_ops and one
>with the default ops?

Because LIKE op don't use index on default ops with non C locale. I found it
on tables of czech communities. Primary key is NUTS - 4..6 numbers. I have
to search values with some prefix -> op Like and on primary key can't to use
std. index.

Pavel

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