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https://issues.apache.org/jira/browse/LUCENE-5983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14160163#comment-14160163
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ASF subversion and git services commented on LUCENE-5983:
---------------------------------------------------------
Commit 1629606 from [~jpountz] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1629606 ]
LUCENE-5983: CachingWrapperFilter now uses RoaringDocIdSet.
> RoaringDocIdSet
> ---------------
>
> Key: LUCENE-5983
> URL: https://issues.apache.org/jira/browse/LUCENE-5983
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-5983.patch
>
>
> Robert pointed me to this paper: http://arxiv.org/pdf/1402.6407v4 that
> describes an interesting way to build doc id sets: The bit space is divided
> into blocks of 2^16 bits so that you can store the bits which are set either
> in a short[] (2 bytes per doc ID) or in a FixedBitSet. The choice is easy, if
> less than 2^12 bits are set, then the short[] representation is more compact
> otherwise a FixedBitSet would be more compact. It's quite similar to the way
> that Solr builds DocSets in {{SolrIndexSearcher.getDocSet(DocsEnumState)}}.
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