Vineet Garg created HIVE-17308:

             Summary: Improvement in join cardinality estimation
                 Key: HIVE-17308
             Project: Hive
          Issue Type: Improvement
          Components: Query Planning
            Reporter: Vineet Garg
            Assignee: Vineet Garg

Currently during logical planning join cardinality is estimated assuming no 
correlation among join keys (This estimation is done using exponential 
backoff). Physical planning on the other hand consider correlation for multi 
keys and uses different estimation. We should consider correlation during 
logical planning as well.

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