SpanQueryFilter addition
------------------------
Key: LUCENE-960
URL: https://issues.apache.org/jira/browse/LUCENE-960
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Reporter: Grant Ingersoll
Priority: Trivial
Similar to the QueryFilter (or whatever it is called now) the SpanQueryFilter
is a regular Lucene Filter, but it also can return Spans-like information.
This is useful if you not only want to filter based on a Query, but you then
want to be able to compare how a given match from a new query compared to the
positions of the filtered SpanQuery. Patch to come shortly also contains a
caching mechanism for the SpanQueryFilter
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