jacques-n commented on pull request #2639:
URL: https://github.com/apache/calcite/pull/2639#issuecomment-991723967


   @jamesstarr, you're right that technically it wouldn't be a breaking change. 
However, it doesn't seem like a good approach since it is a misleading change. 
Having getDef() throw and marking the subinterfaces as functional means you 
have a suggested interface that doesn't actually work in the reflective 
provider. The change here avoids causing that unexpected/misleading behavior. 
As I said, if you want to get rid of the method moving forward, I'm fully 
supportive of doing that.


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