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From: Greg Stark <gsstark@mit.edu>
To: Markus Schaber <schabi@logix-tt.com>
Cc: pgsql-performance@postgresql.org
Cc: pgsql-hackers@postgresql.org
Subject: Re: qsort again (was Re: [PERFORM] Strange Create Index
Date: 16 Feb 2006 17:51:02 -0500
Message-ID: <871wy23okp.fsf@stark.xeocode.com> (raw)
In-Reply-To: <43F4FDCC.2000204@logix-tt.com>
References: <43F38867.6010701@gpdnet.co.uk>
	<19510.1140036968@sss.pgh.pa.us>
	<19779.1140038874@sss.pgh.pa.us>
	<43F39E53.1020009@gpdnet.co.uk>
	<20781.1140046109@sss.pgh.pa.us>
	<7.0.1.0.2.20060215194635.03b55da0@earthlink.net>
	<21615.1140052893@sss.pgh.pa.us>
	<7.0.1.0.2.20060215223710.03a7c618@earthlink.net>
	<20060216113522.GA3461@uio.no>
	<7.0.1.0.2.20060216071053.0385a1a8@earthlink.net>
	<43F481CD.2010509@logix-tt.com>
	<43F4A7D8.4050907@modgraph-usa.com>
	<29277.1140110108@sss.pgh.pa.us>
	<1140128256.9076.254.camel@archimedes>
	<43F4FDCC.2000204@logix-tt.com>

Markus Schaber <schabi@logix-tt.com> writes:

> Hmm, to remove redundancy, I'd change the <= to a < and define:
> 
> if a==b then f(a)==f(b)
> if a<b  then f(a)<=f(b)
> 
> > 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.

-- 
greg

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