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https://issues.apache.org/jira/browse/LUCENE-6332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14345689#comment-14345689
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Mikhail Khludnev commented on LUCENE-6332:
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might be made available for Solr as a query parser like SOLR-6234
> JoinUtil.createSemiJoinQuery()
> ------------------------------
>
> Key: LUCENE-6332
> URL: https://issues.apache.org/jira/browse/LUCENE-6332
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/join
> Affects Versions: 5.0
> Reporter: Mikhail Khludnev
>
> I want to contribute the subj which should do something like ..{{WHERE EXISTS
> (SELECT 1 FROM fromSearcher.search(fromQuery) WHERE fromField=toField)}}. It
> turns out, that it can be returned by the current method
> {{createJoinQuery(...ScoreMode.None)}}
> * at first, it should run {{fromQuery}} first, collect {{fromField}} into
> {{BytesRefHash}} by {{TermsCollector}}, like it's done now
> * then it should return query with _TwoPhase_ Scorer
> * which obtains {{toField}} on {{matches()}} and check term for existence in
> {{BytesRefHash}}
> Do you think it's ever useful? if you do, I can bake a patch.
> Anyway, suggest the better API eg separate method, or enum and actual name!
>
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