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https://issues.apache.org/jira/browse/LUCENE-3602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189501#comment-13189501
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Jason Rutherglen commented on LUCENE-3602:
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{quote}The terms collected in the first phase are from many segments{quote}
Why is that necessary?
{quote}Caching can be improved in the second phase as you described, by saving
a bitset per fromTerm?{quote}
Possibly, only for terms with a high number of documents. Or we can use a
faster to decode (less compressed) posting codec.
bq. The JoinUtil is between 2 till 3 times faster than Solr's JoinQuery with
this data set on my dev machine
Interesting, thanks for sharing.
> 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-3602-3x.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,
> 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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