gengliangwang commented on pull request #28741:
URL: https://github.com/apache/spark/pull/28741#issuecomment-640172081


   @wangyum Thanks for point it out.
   I made a mistake. This solution is not as powerful as CNF conversion since 
it can't even push down such predicate
   ```
   (p1(t1) or p2(t2)) and p3(t1)
   ```
   to `t1`
   
   with CNF we can push down 
   ```
   p1(t1) or p3(t1)
   ```
   
   I am closing this one and reopening #28733


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