Stamatis Zampetakis created HIVE-23999:

             Summary: Unify the code creating single and multi column semijoin 
                 Key: HIVE-23999
             Project: Hive
          Issue Type: Improvement
            Reporter: Stamatis Zampetakis
            Assignee: Stamatis Zampetakis

In HIVE-21196, we add a transformation capable of merging single column 
semijoin reducers to multi column semijoin reducer.

The code for creating multi-column semijoin reducers in SemiJoinReductionMerge 
presents some similarities with the code creating single-column semijoin 
reducers in DynamicPartitionPruningOptimization.

Possibly we could refactor the respective parts to unify the creation logic of 
semijoin reducers.

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