Factory for RangeFilters that caches sections of ranges to reduce disk reads
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Key: LUCENE-798
URL: https://issues.apache.org/jira/browse/LUCENE-798
Project: Lucene - Java
Issue Type: New Feature
Components: Search
Reporter: Mark Harwood
RangeFilters can be cached using CachingWrapperFilter but are only re-used if a
user happens to use *exactly* the same upper/lower bounds.
This class demonstrates a caching approach where *sections* of ranges are
cached as bitsets and these are re-used/combined to construct large range
filters if they fall within the required range. This can improve the "cache
hit" ratio and avoid going to disk to read large lists of Doc ids from TermDocs.
This class needs some more work to add thread safety but I'm making it
available to gather feedback on the design at this early stage before making
robust.
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