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https://issues.apache.org/jira/browse/LUCENE-3602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182329#comment-13182329
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Martijn van Groningen commented on LUCENE-3602:
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bq. But I think the first 2 passes could be combined?
That idea also crossed my mind. We should definitely do this.

bq Also, instead of making a toplevel bit set as the return result... could it 
be an ordinary filter? 
I like that approach. It can just return a TermsFilter instance, right?

Maybe we should have to variants one returns a MTQ and one a TermsFilter? So 
users can choose whether to want a filter or a query.

                
> Add join query to Lucene
> ------------------------
>
>                 Key: LUCENE-3602
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3602
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: modules/join
>            Reporter: Martijn van Groningen
>         Attachments: LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch
>
>
> Solr has (psuedo) join query for a while now. I think this should also be 
> available in Lucene.  

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