zhztheplayer commented on PR #6744:
URL: 
https://github.com/apache/incubator-gluten/pull/6744#issuecomment-2272911353

   Thanks for working on this.
   
   Since the new rule looks like a manually written "coster", actually I 
recommend to use RAS planner to achieve the same.
   
   RAS planner is so far mature enough to handle cases like this. All we need 
is to change the cost model. 
   
   I know it's a safer choice to make the change in legacy planner but I am 
afraid using single rules to do such fallback is a way that increases planner 
code's complexity silently until being unmaintainable.


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