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Re: pgsql: Protect GIST logic that assumes penalty values can't be negative - Mailing list pgsql-hackers

From	Alexander Korotkov
Subject	Re: pgsql: Protect GIST logic that assumes penalty values can't be negative
Date	June 1, 2011 07:20:32
Msg-id	BANLkTi=mQGDtrb+zxcRMxmMoWeVpmRM8Gw@mail.gmail.com Whole thread Raw
In response to	Re: pgsql: Protect GIST logic that assumes penalty values can't be negative (Greg Stark <gsstark@mit.edu>)
List	pgsql-hackers

On Wed, Jun 1, 2011 at 3:57 AM, Greg Stark <gsstark@mit.edu> wrote:

I guess it was obvious but that was "expect the *penalty* function to
obey the triangle inequality"

Actually, penalty function for boxes is even not commutative. Fox example:

A = ((0,0)-(1,1))

B = ((0,0)-(2,2))

penalty(A,B) = 3

penalty(B,A) = 0

------
With best regards,
Alexander Korotkov.

From: Tatsuo Ishii
Date: 01 June 2011, 07:03:04
Subject: Re: patch for new feature: Buffer Cache Hibernation

From: "Albe Laurenz"
Date: 01 June 2011, 07:32:16
Subject: Re: [DOCS] DOCS: SGML identifier may not exceed 44 characters