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https://issues.apache.org/jira/browse/LUCENE-6959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15842606#comment-15842606
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Michael McCandless commented on LUCENE-6959:
--------------------------------------------

New patch looks great, except for the {{TestBlockJoin}} tests ... I can take a 
crack at putting back some of the child hit checking there, if you all haven't 
started on that yet?

> 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
>         Attachments: LUCENE_6959.patch, LUCENE_6959.patch, LUCENE_6959.patch, 
> LUCENE_6959.patch, LUCENE-6959.patch
>
>
> 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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