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postgres/doc/src
Tom Lane ca76a3956c Protect GIST logic that assumes penalty values can't be negative.
Apparently sane-looking penalty code might return small negative values,
for example because of roundoff error.  This will confuse places like
gistchoose().  Prevent problems by clamping negative penalty values to
zero.  (Just to be really sure, I also made it force NaNs to zero.)
Back-patch to all supported branches.

Alexander Korotkov
2011-05-31 17:54:06 -04:00
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