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Re: Multi-Dimensional Histograms

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: David Fetter <david(at)fetter(dot)org>
Cc: Nathan Boley <npboley(at)gmail(dot)com>, PG Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Multi-Dimensional Histograms
Date: 2009-06-29 22:43:35
Message-ID: 1239.1246315415@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
David Fetter <david(at)fetter(dot)org> writes:
> On Mon, Jun 29, 2009 at 01:28:01PM -0700, Nathan Boley wrote:
>> ... They dismiss
>> singular value decomposition and the discrete wavelet transform as
>> being too parametric ( which is silly, IMHO )

> Should we have a separate discussion about eigenvalues?  Wavelets?

I think it'd be a short discussion: what will you do with non-numeric
datatypes?  We probably don't really want to assume anything stronger
than that the datatype has a total ordering.

			regards, tom lane

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