Backport Join support to Solr 3.x
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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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