Abstract Spatial distance filtering process and supported field formats
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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
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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