Stamatis Zampetakis created HIVE-23976:

             Summary: Enable vectorization for multi-col semi join reducers
                 Key: HIVE-23976
             Project: Hive
          Issue Type: Improvement
            Reporter: Stamatis Zampetakis
            Assignee: Stamatis Zampetakis

HIVE-21196 introduces multi-column semi-join reducers in the query engine. 
However, the implementation relies on GenericUDFMurmurHash which is not 
vectorized thus the respective operators cannot be executed in vectorized mode. 

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