Github user gatorsmile commented on the pull request:

    https://github.com/apache/spark/pull/11765#issuecomment-199444598
  
    @sameeragarwal That is just an example that exposes this issue. I think 
`Cast` is just one of multiple compound cases. If we can avoid pushing down any 
filters that have been included in the children's `Constraints`. Then, it will 
avoid useless predicate pushdown. 


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