Re: pgsql: Protect GIST logic that assumes penalty values can't be negative

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От Alexander Korotkov
Тема Re: pgsql: Protect GIST logic that assumes penalty values can't be negative
Дата
Msg-id BANLkTi=mQGDtrb+zxcRMxmMoWeVpmRM8Gw@mail.gmail.com
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Ответ на Re: pgsql: Protect GIST logic that assumes penalty values can't be negative  (Greg Stark <gsstark@mit.edu>)
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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
 
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With best regards,
Alexander Korotkov.

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