yangzhg opened a new pull request #3806:
URL: https://github.com/apache/incubator-doris/pull/3806


   implemnets #3803 
   Support remove some unmeaningful order by clause.
   Because of we don't support memory  spill, so add a session variable to 
allow  remove order by for subquery in set opertion clause, after we support 
memory  spill we should set the default value to true.


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