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https://issues.apache.org/jira/browse/LUCENE-6015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14178115#comment-14178115
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ASF subversion and git services commented on LUCENE-6015:
---------------------------------------------------------

Commit 1633306 from [~jpountz] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1633306 ]

LUCENE-6015: DocIdSetBuilder: Use the sparse set until more than 1/16 of the 
longs have one bit set.

> Revisit DocIdSetBuilder's heuristic to switch to FixedBitSet
> ------------------------------------------------------------
>
>                 Key: LUCENE-6015
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6015
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-6015.patch
>
>
> DocIdSetBuilder starts with a SparseFixedBitSet and then upgrades to a 
> FixedBitSet when the cardinality grows larger than maxDoc >>> 14. However 
> Robert improved SparseFixedBitSet performance quite significantly in 
> LUCENE-6003 so we should see if it makes sense to update this heuristic.



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