David Smiley created LUCENE-4978:
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Summary: Spatial search with point query won't find identical
indexed point
Key: LUCENE-4978
URL: https://issues.apache.org/jira/browse/LUCENE-4978
Project: Lucene - Core
Issue Type: Bug
Components: modules/spatial
Affects Versions: 4.1
Reporter: David Smiley
Assignee: David Smiley
Priority: Minor
Given a document with indexed POINT (10 20), when a search for INTERSECTS(
POINT (10 20)) is issued, no results are returned.
The work-around is to not search with a point shape, use a very small-radius
circle or rectangle. (I'm marking this issue as "minor" because it's easy to
do this).
An unstated objective of the PrefixTree/grid approximation is that no matter
what precision you use, an intersects query will find all true-positives. Due
to approximations, it may also find some close false-positives. But in the
case above, that unstated promise is violated. But it can also happen for
query shapes other than points which do in fact barely enclose the point given
at index time yet the indexed point is in-effect shifted to the center point of
a cell which could be outside the query shape, and ultimately leading to a
false-negative.
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