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: 3.3


Join support was recently added to Solr trunk (4.0).  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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