liukun4515 commented on issue #2021:
URL: 
https://github.com/apache/arrow-datafusion/issues/2021#issuecomment-1069977175


   Maybe we can add some tag in the `filterexpr` and the tag can point out 
whether it is pushed down or not.
   In the explain we can print the information for this.
   I think it's not a good way to add useless filed in the `TableScan`


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