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https://issues.apache.org/jira/browse/LUCENE-6332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikhail Khludnev updated LUCENE-6332:
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Attachment: LUCENE-6332.patch
attaching DocValuesScanQuery.java with a trivial test. It works for BinaryDV
only (ord- coded Sorted(Set)DV can be implemented too, but avoiding term
lookups is more preferable, eg LUCENE-6352).
One more idea is to check number of collected terms at from side and choose
between TermsQuery (lookup in term dict, current JoinUtil) and this approach -
scanning all DV column. WDYT?
> join query scanning "toField" docValue
> -----------------------------------------
>
> 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
> Attachments: LUCENE-6332.patch
>
>
> 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}} docValue 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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