morningman opened a new pull request #1489: Remove query status report from BE 
when query is cancelled normally
URL: https://github.com/apache/incubator-doris/pull/1489
 
 
   When query result reach limit, the Coordinator in FE will send a cancel
   request to BE to cancel the query. And when being cancelled, BE will report
   query status to FE for debug purpose. But actually it is not necessary
   and will generate too many logs.
   
   So I add a CancelReason to distinguish the difference between 'normally'
   cancellation and 'internal error' cancellation. if 'normally' cancelled,
   no status will be reported to FE.
   
   When query reach limit, or user cancel it actively, it is being cancelled 
'normally'.
   Otherwise, the query is cancelled due to internal error, which will need
   a report from BE.

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