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https://issues.apache.org/jira/browse/LUCENE-4869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated LUCENE-4869:
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Summary: Optimize IsWithin spatial RPT to use a point cache for
false-positive removal (was: Optimize IsWithin spatial RPT to use a point
cache for false-positve removal)
> Optimize IsWithin spatial RPT to use a point cache for false-positive removal
> -----------------------------------------------------------------------------
>
> Key: LUCENE-4869
> URL: https://issues.apache.org/jira/browse/LUCENE-4869
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/spatial
> Reporter: David Smiley
>
> LUCENE-4644 implemented the "IsWithin" predicate for a RecursivePrefixTree
> based field. It's slow since it looks across the whole world to ensure it
> doesn't match docs with data anywhere outside the query shape. It can be
> configured to only look outside the query shape using a very small buffer
> distance, and that will filter out documents spanning the query shape
> boundary, but not indexed shapes comprised of multiple disjoint parts. The
> solution proposed here is to index a point per disjoint part in such a way
> that it can be easily retrieved (e.g. DocValues) and then a post-process of
> WithinPrefixTreeFilter would remove false-positives.
> This isn't particularly hard/advanced but it requires some advances in some
> APIs that aren't quite there yet. Spatial4j's ShapeCollection (aka WKT
> GeometryCollection or Multi*) needs to get released, it needs a vertex
> iterator. There needs to be code to read and write a set of points to a
> BinaryDocValues field (1/doc). And finally of course WithinPrefixTreeFilter
> needs to have a mode in which it uses the smallest buffer and then in the end
> checks the DocValues to remove false-postivies.
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