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https://issues.apache.org/jira/browse/LUCENE-3282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14202176#comment-14202176
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Mikhail Khludnev commented on LUCENE-3282:
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[~kimchy] fwiw SOLR-5743 uses BJQScorer method to obtain matched children. Does
it solves 'custom child collector' ?
> BlockJoinQuery: Allow to add a custom child collector, and customize the
> parent bitset extraction
> -------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3282
> URL: https://issues.apache.org/jira/browse/LUCENE-3282
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 3.4, 4.0-ALPHA
> Reporter: Shay Banon
> Attachments: LUCENE-3282.patch, LUCENE-3282.patch
>
>
> It would be nice to allow to add a custom child collector to the
> BlockJoinQuery to be called on every matching doc (so we can do things with
> it, like counts and such). Also, allow to extend BlockJoinQuery to have a
> custom code that converts the filter bitset to an OpenBitSet.
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