Eugene Koifman created HIVE-14946:

             Summary: Optimizations
                 Key: HIVE-14946
             Project: Hive
          Issue Type: Sub-task
          Components: Query Planning, Transactions
            Reporter: Eugene Koifman

For example, if there is only WHEN NOT MATCHED clause, the base generating 
expression can be an INNER JOIN

Generally, we should make sure the optimizer is able to work with the plan for 
Merge statement

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