mingjialiu commented on pull request #29564:
URL: https://github.com/apache/spark/pull/29564#issuecomment-689963482


   > If exchange reuse is broken, it means plan equality is broken somewhere. I 
think `Seq[Expression]` is OK as long as we canonicalize it before comparing 
it. `FileSourceScanExec` also contains `Seq[Expression]` and it's fine.
   > 
   > Can you look into it more and have a more surgical fix?
   
   Updated with a more surgical fix. Please review.


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