hsyuan commented on pull request #1976:
URL: https://github.com/apache/calcite/pull/1976#issuecomment-628792593


   > How do you guarantee only logical nodes are generated in transformation 
rule? 
   
   It is allowed, but not encouraged. Just a contract, unless we add a check 
inside `call.transformTo`, which can be added in next version.
   
   > Also please make sure to include this in the release note as a potential 
breaking change.
   
   What do you think it will break?
   


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