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From "David Smiley (JIRA)" <>
Subject [jira] [Created] (LUCENE-4916) Spatial WithinPrefixTreeFilter can too eagerly find false-positive
Date Mon, 08 Apr 2013 05:35:15 GMT
David Smiley created LUCENE-4916:

             Summary: Spatial WithinPrefixTreeFilter can too eagerly find false-positive 
                 Key: LUCENE-4916
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/spatial
            Reporter: David Smiley
            Assignee: David Smiley
            Priority: Minor

The recently committed WithinPrefixTreeFilter can sometimes match a false-positive due to
the grid approximation technique.  Some of this is normal.  But if an indexed shape has any
of its leaf detail levels "simplified" (removed) up to a higher level, then a false-positive
match can occur that is a little too eager when one of those cells that were simplified-away
don't intersect the query shape, and thus shouldn't be considered a match for this predicate.

Marking as "Minor" because it should be quite rare, and when it does occur, the answer (a
match) will usually appear close-enough due to the grid approximation that it's not a totally
inaccurate answer.  I found this problem via extensive randomized testing.  I want to fix
it because it should make my new tests pass :-)

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