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https://issues.apache.org/jira/browse/SOLR-2604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825222#comment-13825222
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Thomas Champagne commented on SOLR-2604:
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This issue is not in the good milestone.
I think it can be closed because it is outdated.
> Backport Join support to Solr 3.x
> ---------------------------------
>
> Key: SOLR-2604
> URL: https://issues.apache.org/jira/browse/SOLR-2604
> Project: Solr
> Issue Type: New Feature
> Components: search
> Reporter: Doug Mittendorf
> Priority: Minor
> Fix For: 4.6
>
> Attachments: SOLR-2604.patch
>
>
> Join support was recently added to Solr trunk (4.0) via SOLR-2272. We have a
> need for this functionality, but don't want to upgrade to trunk, so I spent
> some time back-porting the feature to work with the 3.x APIs. Not all of the
> optimizations that Yonik implemented have been ported since the 3.x APIs
> don't allow the same low-level access to the index, but the basic
> functionality is in place and seems to work well when joining between an
> index with 1.2M docs and another with 300k docs.
> I still have yet to back-port the unit tests as those are heavily dependent
> on other 4.0 code, but wanted to go ahead and post the initial code in case
> others can make use of it.
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