Gopal V created HIVE-19213:

             Summary: QueryCache: Stop opening transactions on _dummy_table
                 Key: HIVE-19213
             Project: Hive
          Issue Type: Bug
            Reporter: Gopal V

When the query-cache is hit, the ACID TxnManager opens a txn + lock + 
heartbeats on _dummy_database._dummy_table.

This is blocking the query-cache from jumping through the fast-paths for 

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