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https://issues.apache.org/jira/browse/LUCENE-3602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187457#comment-13187457
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Robert Muir commented on LUCENE-3602:
-------------------------------------
Just a few ideas about 3.x backport:
* MultiTermQuery doesn't have a real 'seek' there... you have to open up and
swap in a new 'actualEnum' (does this clone the indexinput etc?) starting at
the new seek position... I think its tricky and ugly. Maybe we can/should seek
to 3.x TermEnum/FilteredTermEnum so this will work nicer...? I havent looked at
how hairy this would be though.
* The rewrites are not always per-segment like they are in trunk, and it could
be bad to "seek" a lot when MTQ is in 'auto mode' because if I recall its
expensive (creating lots of multitermsenums). Maybe since Join knows up-front
how many terms are in the hash it should determine which method to use itself
(setRewriteMethod)... maybe on 3.x just set filter rewrite since you know will
be "seeking"? Since you return the query the user could still always override
the rewrite method if they really care, it would just be a default.
> 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
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch,
> LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch,
> 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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