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https://issues.apache.org/jira/browse/LUCENE-6015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14177439#comment-14177439
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Robert Muir commented on LUCENE-6015:
-------------------------------------
+1
> 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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