Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/19938
  
    I have the same feeling with @viirya , expressions/operators usually won't 
mutate input from children. One concern is how to guarantee this 
programmatically, but might be OK as I don't think this would happen. We can 
also remove the temp global variables introduced by the recent commits from 
@kiszk 


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