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Re: Multi-Dimensional Histograms

From: David Fetter <david(at)fetter(dot)org>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
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 22:56:44
Message-ID: 20090629225644.GJ21081@fetter.org (view raw or flat)
Thread:
Lists: pgsql-hackers
On Mon, Jun 29, 2009 at 06:43:35PM -0400, Tom Lane wrote:
> 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.

That sounds about like the discussion we needed unless we later decide
we need to do something special for approximations of R^n :)

Cheers,
David.
-- 
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david(dot)fetter(at)gmail(dot)com

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