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https://issues.apache.org/jira/browse/LUCENE-6959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15432496#comment-15432496
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Mikhail Khludnev commented on LUCENE-6959:
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Note. SOLR-8643 removed BlockJoinFacetCollector which calls scorer getChildren()
> Remove ToParentBlockJoinCollector
> ---------------------------------
>
> Key: LUCENE-6959
> URL: https://issues.apache.org/jira/browse/LUCENE-6959
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
>
> This collector uses the getWeight() and getChildren() methods from the passed
> in Scorer, which are not always available (eg. disjunctions expose fake
> scorers) hence the need for a dedicated IndexSearcher
> (ToParentBlockJoinIndexSearcher). Given that this is the only collector in
> this case, I would like to remove it.
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