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https://issues.apache.org/jira/browse/LUCENE-4594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528137#comment-13528137
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Commit Tag Bot commented on LUCENE-4594:
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[trunk commit] David Wayne Smiley
http://svn.apache.org/viewvc?view=revision&revision=1419630
LUCENE-4594: PrefixTreeStrategy should not index center points
> 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
>
> Attachments:
> LUCENE-4594__PrefixTreeStrategy_should_not_index_center_points.patch
>
>
> 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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