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https://issues.apache.org/jira/browse/LUCENE-2152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801401#action_12801401
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Chris Male commented on LUCENE-2152:
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I am currently working on a new patch that will incorporate the ideas discussed
here and will attach it shortly.
> Abstract Spatial distance filtering process and supported field formats
> -----------------------------------------------------------------------
>
> Key: LUCENE-2152
> URL: https://issues.apache.org/jira/browse/LUCENE-2152
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/spatial
> Affects Versions: 3.1
> Reporter: Chris Male
> Attachments: LUCENE-2152.patch, LUCENE-2152.patch, LUCENE-2152.patch
>
>
> Currently the second stage of the filtering process in the spatial contrib
> involves calculating the exact distance for the remaining documents, and
> filtering out those that fall out of the search radius. Currently this is
> done through the 2 impls of DistanceFilter, LatLngDistanceFilter and
> GeoHashDistanceFilter. The main difference between these 2 impls is the
> format of data they support, the former supporting lat/lngs being stored in 2
> distinct fields, while the latter supports geohashed lat/lngs through the
> GeoHashUtils. This difference should be abstracted out so that the distance
> filtering process is data format agnostic.
> The second issue is that the distance filtering algorithm can be considerably
> optimized by using multiple-threads. Therefore it makes sense to have an
> abstraction of DistanceFilter which has different implementations, one being
> a multi-threaded implementation and the other being a blank implementation
> that can be used when no distance filtering is to occur.
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