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https://issues.apache.org/jira/browse/LUCENE-3685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-3685.
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Resolution: Fixed
> Add top-down version of BlockJoinQuery
> --------------------------------------
>
> Key: LUCENE-3685
> URL: https://issues.apache.org/jira/browse/LUCENE-3685
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/join
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3685.patch
>
>
> Today, BlockJoinQuery can join from child docIDs up to parent docIDs.
> EG this works well for product (parent) + many SKUs (child) search.
> But the reverse, which BJQ cannot do, is also useful in some cases.
> EG say you index songs (child) within albums (parent), but you want to
> search and present by song not album while involving some fields from
> the album in the query. In this case you want to wrap a parent query
> (against album), joining down to the child document space.
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