| From: | Mark Lewis <mark(dot)lewis(at)mir3(dot)com> |
|---|---|
| To: | Greg Stark <gsstark(at)mit(dot)edu> |
| Cc: | Markus Schaber <schabi(at)logix-tt(dot)com>, pgsql-performance(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: qsort again (was Re: [PERFORM] Strange Create Index |
| Date: | 2006-02-16 23:23:09 |
| Message-ID: | 1140132189.9076.261.camel@archimedes |
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| Lists: | pgsql-hackers pgsql-performance |
On Thu, 2006-02-16 at 17:51 -0500, Greg Stark wrote:
> > > Data types which could probably provide a useful function for f would be
> > > int2, int4, oid, and possibly int8 and text (at least for SQL_ASCII).
>
> How exactly do you imagine doing this for text?
>
> I could see doing it for char(n)/varchar(n) where n<=4 in SQL_ASCII though.
In SQL_ASCII, just take the first 4 characters (or 8, if using a 64-bit
sortKey as elsewhere suggested). The sorting key doesn't need to be a
one-to-one mapping.
-- Mark Lewis
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