Sergey Shelukhin created HIVE-20029:
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             Summary: add negative tests
                 Key: HIVE-20029
                 URL: https://issues.apache.org/jira/browse/HIVE-20029
             Project: Hive
          Issue Type: Sub-task
            Reporter: Sergey Shelukhin


We need a few tests, esp. for parallel case, where we verify that stats are NOT 
used.
Right now many code paths don't fail but return -1, null or whatever when 
something else is not present, so positive tests might pass because they skip 
the check, not because the check passes.



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