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https://issues.apache.org/jira/browse/LUCENE-798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Harwood updated LUCENE-798:
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Attachment: CachedRangesFilterFactory.java
> Factory for RangeFilters that caches sections of ranges to reduce disk reads
> ----------------------------------------------------------------------------
>
> Key: LUCENE-798
> URL: https://issues.apache.org/jira/browse/LUCENE-798
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Reporter: Mark Harwood
> Attachments: CachedRangesFilterFactory.java
>
>
> 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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