Vineet Garg created HIVE-20842:

             Summary: Fix logic introduced in HIVE-20660 to estimate statistics 
for group by
                 Key: HIVE-20842
             Project: Hive
          Issue Type: Bug
          Components: Statistics
    Affects Versions: 4.0.0
            Reporter: Vineet Garg
            Assignee: Vineet Garg

HIVE-20660 introduced better estimation for group by operator. But the logic 
did not account for Partial and Full group by separately.
For partial group by parallelism (i.e. number of tasks) should be taken into 

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