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https://issues.apache.org/jira/browse/LUCENE-6228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16604039#comment-16604039
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Alan Woodward commented on LUCENE-6228:
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This should be fixed now, sorry for the noise.
> Do not expose full-fledged scorers in LeafCollector.setScorer
> -------------------------------------------------------------
>
> Key: LUCENE-6228
> URL: https://issues.apache.org/jira/browse/LUCENE-6228
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Alan Woodward
> Priority: Major
> Fix For: master (8.0)
>
> Attachments: LUCENE-6228.patch, LUCENE-6228.patch, LUCENE-6228.patch,
> LUCENE-6228.patch, LUCENE-6228.patch, LUCENE-6228.patch
>
>
> Currently LeafCollector.setScorer takes a Scorer, which I don't like because
> several methods should never be called in the context of a Collector (like
> nextDoc or advance).
> I think it's even more trappy for methods that might seem to work in some
> particular cases but will not work in the general case, like getChildren
> which will not work if you have a specialized BulkScorer or iterating over
> positions which will not work if you are in a MultiCollector and another leaf
> collector consumes positions too.
> So I think we should restrict what can be seen from a collector to avoid such
> traps.
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