[jira] [Created] (KYLIN-2152) TopN group by column does not distinguish between NULL and ""

[hongbin ma (JIRA)]

hongbin ma created KYLIN-2152:
---------------------------------

             Summary: TopN group by column does not distinguish between NULL 
and ""
                 Key: KYLIN-2152
                 URL: https://issues.apache.org/jira/browse/KYLIN-2152
             Project: Kylin
          Issue Type: Bug
            Reporter: hongbin ma
            Assignee: Shaofeng SHI






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