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https://issues.apache.org/jira/browse/LUCENE-3282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066536#comment-13066536
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Shay Banon commented on LUCENE-3282:
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The idea of this is to collect matching child docs regardless of what matches
parent wise, and yea, we might miss some depending on the type of query that is
actually "wrapping" it, but I think its still useful.
> 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 - Java
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 3.4, 4.0
> 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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