SteveStevenpoor commented on PR #27166:
URL: https://github.com/apache/flink/pull/27166#issuecomment-3540568585

   Hey @snuyanzin! Thanks for the review — most of the comments are already 
addressed.
   Regarding `NoCommonJoinKeyException`: I think we should keep it where it is, 
since `AttributeBasedJoinKeyExtractor` is used in both exec and physical rules, 
and this exception needs to be thrown from both places.


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