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https://issues.apache.org/jira/browse/LUCENE-6959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15836779#comment-15836779
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Martijn van Groningen commented on LUCENE-6959:
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+1 To remove this collector in the master and 6x branches.
As a follow up issue we can add back to ability to include child docs, but in a
different way than is done today. A subsequent search after the main search,
that selects child docs for specific parents. For example like is done here:
https://github.com/elastic/elasticsearch/blob/master/core/src/main/java/org/elasticsearch/search/fetch/subphase/InnerHitsContext.java#L160
> 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
>
>
> 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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