cshuo commented on pull request #16669:
URL: https://github.com/apache/flink/pull/16669#issuecomment-894096227


   @beyond1920 My main concern is that `translateSessionWindowOperator` is 
actually duplicated and non-trivial code as that in 
`StreamExecGroupWindowAggregate`, I think we should avoid maintaining same code 
in two places.
   
   For 2, I not quite clear about what you mean by "limit", routine to old 
window only changes the runtime operator, which does not affect any plan.
   


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