alamb opened a new pull request, #4332:
URL: https://github.com/apache/arrow-datafusion/pull/4332

   # Which issue does this PR close?
   
   Closes https://github.com/apache/arrow-datafusion/issues/4331
   
   # Rationale for this change
   
   
   # What changes are included in this PR?
   
   Teach optimizer that `CoalesceBatchesExec` does not destroy output order
   
   # Are these changes tested?
   
   TODO
   
   # Are there any user-facing changes?
   
   BasicEnforcement will not add unecessary `SortExec`s


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