Mikhail Khludnev created LUCENE-6332:
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Summary: 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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