| From: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
|---|---|
| To: | Greg Stark <gsstark(at)mit(dot)edu> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "<pgsql-hackers(at)postgresql(dot)org>" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: pgsql: Protect GIST logic that assumes penalty values can't be negative |
| Date: | 2011-06-01 07:20:04 |
| Message-ID: | BANLkTi=mQGDtrb+zxcRMxmMoWeVpmRM8Gw@mail.gmail.com |
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| Lists: | pgsql-committers pgsql-hackers |
On Wed, Jun 1, 2011 at 3:57 AM, Greg Stark <gsstark(at)mit(dot)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.
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