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https://issues.apache.org/jira/browse/LUCENE-6329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14345395#comment-14345395
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Adrien Grand commented on LUCENE-6329:
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I opened LUCENE-6330 to tackle BooleanScorer (and maybe others).
> Calling score() should be ok even if needsScores is false
> ---------------------------------------------------------
>
> Key: LUCENE-6329
> URL: https://issues.apache.org/jira/browse/LUCENE-6329
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: Trunk, 5.1
>
> Attachments: LUCENE-6329.patch
>
>
> Currently if you use approximations on a disjunction scorer and call score()
> while needsScores was set to false, then you might run into exceptions.
> The reason is that when scores are not needed then the scorer doesn't
> maintain the list of scorers positioned on the current doc ID and you can eg.
> end up with exhausted scorers in this list.
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