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https://issues.apache.org/jira/browse/LUCENE-6337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14346901#comment-14346901
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Adrien Grand commented on LUCENE-6337:
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I added ToParentBlockJoinIndexSearcher as a hack so that
ToParentBlockJoinCollector still works. We should remove
ToParentBlockJoinCollector or fix it so that it does not depend on
Scorer.getChildren and the fact that sub scorers are positioned.
> ToParentBlockJoinIndexSearcher does not handle CollectionTerminatedException
> correctly
> --------------------------------------------------------------------------------------
>
> Key: LUCENE-6337
> URL: https://issues.apache.org/jira/browse/LUCENE-6337
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/join
> Affects Versions: 5.0
> Reporter: Christoph Kaser
>
> ToParentBlockJoinIndexSearcher overrides the search-method of IndexSearcher.
> However, unlike IndexSearcher, it does not catch the
> CollectionTerminatedException, which would allow a Collector to permaturely
> terminate the collection of a segment.
> This is an issue if this searcher is used for a search with a MultiCollector
> oder a collector other than ToParentBlockJoinCollector.
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