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From: Neil Conway <neilc@samurai.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Greg Stark <gsstark@mit.edu>
Cc: Jim C. Nasby <decibel@decibel.org>
Cc: Christopher Petrilli <petrilli@gmail.com>
Cc: Ying Lu <ying_lu@cs.concordia.ca>
Cc: pgsql-general@postgresql.org
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL
Date: Thu, 12 May 2005 00:14:50 +1000
Message-ID: <4282135A.8000909@samurai.com> (raw)
In-Reply-To: <3485.1115819827@sss.pgh.pa.us>
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	<427F8321.5030702@samurai.com>
	<20050509163423.GH35026@decibel.org>
	<427F9211.2090008@samurai.com>
	<20050509165133.GJ35026@decibel.org>
	<427FFCD3.1010803@samurai.com>
	<4407.1115698257@sss.pgh.pa.us>
	<428037A2.4060304@samurai.com>
	<6686.1115700888@sss.pgh.pa.us>
	<878y2nsj7i.fsf@stark.xeocode.com>
	<428209BA.8070907@samurai.com>
	<3485.1115819827@sss.pgh.pa.us>

Tom Lane wrote:
> Performance?

I'll run some benchmarks tomorrow, as it's rather late in my time zone. 
If anyone wants to post some benchmark results, they are welcome to.

> I disagree completely with the idea of forcing this behavior for all
> datatypes.  It could only be sensible for fairly wide values; you don't
> save enough to justify the lossiness otherwise.

I think it would be premature to decide about this before we see some 
performance numbers. I'm not fundamentally opposed, though.

> [ BTW, posting patches to pgsql-general seems pretty off-topic. ]

Not any more than discussing implementation details is :) But your point 
is well taken, I'll send future patches to -patches.

-Neil

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