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https://issues.apache.org/jira/browse/LUCENE-5103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13707731#comment-13707731
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Robert Muir commented on LUCENE-5103:
-------------------------------------

This wasn't actually fixed on the 4.4 release branch.
                
> join on single-valued field with deleted docs scores too few docs
> -----------------------------------------------------------------
>
>                 Key: LUCENE-5103
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5103
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/join
>    Affects Versions: 4.3.1
>            Reporter: David Smiley
>            Assignee: David Smiley
>             Fix For: 4.4
>
>         Attachments: LUCENE-5103_join_livedocs_bug.patch
>
>
> TermsIncludingScoreQuery has an inner class SVInnerScorer used when the "to" 
> side of a join is single-valued.  This has a nextDocOutOfOrder() method that 
> is faulty when there are deleted documents, and a document that is deleted is 
> matched by the join.  It'll terminate with NO_MORE_DOCS prematurely.  
> Interestingly, it _appears_ MVInnerScorer (multi-valued) was coded properly 
> to not have this problem.

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