xiedeyantu commented on PR #4620:
URL: https://github.com/apache/calcite/pull/4620#issuecomment-3546155353

   Thanks for the explanation @dssysolyatin . Indeed, it's quite challenging to 
write a comprehensive test  #4641 . I've drafted a general approach (still a 
rough sketch) – please feel free to review its feasibility. As you mentioned, 
we probably need to clarify which RelNode classes should have visit methods in 
RelShuttle and which shouldn't (those should be excluded in the test). I'm not 
sure if this type of test would be acceptable to the team.


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