Github user rxin commented on the issue:

    https://github.com/apache/spark/pull/20560
  
    Just saw this - this seems like a somewhat awkward way to do it by just 
matching on filter / project. Is the main thing lacking a way to do back 
propagation for properties? (We can only do forward propagation at the moment 
on properties so we can't eliminate subtree's sort based on the parent's sort).


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