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https://issues.apache.org/jira/browse/LUCENE-6850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14974175#comment-14974175
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ASF subversion and git services commented on LUCENE-6850:
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Commit 1710591 from [~jpountz] in branch 'dev/trunk'
[ https://svn.apache.org/r1710591 ]

LUCENE-6850: Optimize BooleanScorer for sparse clauses.

> BooleanWeight should not use BS1 when there is a single non-null clause
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-6850
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6850
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-6850.patch, LUCENE-6850.patch
>
>
> When a disjunction has a single non-null scorer, we still use BS1 for 
> bulk-scoring, which first collects matches into a bit set and then calls the 
> collector. This is inefficient: we should just call the inner bulk scorer 
> directly and wrap the scorer to apply the coord factor (like 
> BooleanTopLevelScorers.BoostedScorer does).



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