David Smiley created LUCENE-4594:
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Summary: Spatial PrefixTreeStrategy shouldn't index center-points
with shapes together
Key: LUCENE-4594
URL: https://issues.apache.org/jira/browse/LUCENE-4594
Project: Lucene - Core
Issue Type: Bug
Components: modules/spatial
Affects Versions: 4.0, 5.0
Reporter: David Smiley
Assignee: David Smiley
Fix For: 4.1, 5.0
The Spatial PrefixTreeStrategy will index the center-point of a non-point shape
it is given to index, in addition to the shape itself of course. The rationale
was that this point could be picked up by PointPrefixTreeFieldCacheProvider for
distance/sorting. However this approach is buggy since the distinction of grid
cells between the center point and the shape itself is lost when the shape gets
indexed down to max-levels precision -- each grid cell therein appears to be
another point that needs to be brought into memory. It's also possible that
the shape is a LineString or some other non-trivial shape in which its center
point isn't actually in the shape.
Even if you knew this problem would never happen, I think you're better off
indexing center points into another spatial field if you want them. Perhaps
arguably this strategy could do that internally? Wether or not that ends up
happening, I just want to remove the problematic behavior now.
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