mingmwang commented on PR #6009:
URL: 
https://github.com/apache/arrow-datafusion/pull/6009#issuecomment-1508251440

   Could you please add a flag to turn on/off the partition aware logic ?
   Originally I add the logic is because there is an open ticket for this.
   https://github.com/apache/arrow-datafusion/issues/189
   
   And in SparkSQL, it has similar optimization.
   
   For `UnionExec`, keep the ordering or keep the partitioning are conflict 
requirements. In some case we would like to keep
   the ordering info but in some other cases/systems(distributed systems), we 
want to keep the partitioning to avoid data shuffle.
   


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