David Smiley created LUCENE-4900:
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Summary: Add spatial edge approximations: include/exclude/center
Key: LUCENE-4900
URL: https://issues.apache.org/jira/browse/LUCENE-4900
Project: Lucene - Core
Issue Type: New Feature
Components: modules/spatial
Reporter: David Smiley
Priority: Minor
The RecursivePrefixTree predicates incidentally buffer the query shape slightly
to your specifications (distErr, distErrPct) as a byproduct of fitting it to a
grid, thus making the search area slightly (or not so slightly) larger than the
given shape. Because of the grid approximation, some amount of this is
unavoidable. The result is that these predicates can match some
false-positives that are slightly outside the query shape. The user might want
instead to not match those false positives on the edge at all and is willing to
accept the reverse inaccuracy -- not matching false-negatives i.e. sort of
reverse-buffering the shape edge. Or the user might instead want to substitute
the center point of the a cell at the shape's edge to detect if it's a match or
not -- thus some false-positives will match and some false-negatives won't
match but at a higher detail.
Based on the way these predicates are implemented, it'd be pretty easy to add
support for these conditions. Arguably there is an index-time analog to this
idea as well but that'd be harder.
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