adriangb commented on issue #22065:
URL: https://github.com/apache/datafusion/issues/22065#issuecomment-4427473669

   @alamb i think this is another reason to do something like 
https://github.com/apache/datafusion/issues/21835.
   
   As it currently stands it’s easy to add a new expression and forget to add 
it to the proto (it downcast matches), and it’s easy to add a new field to an 
execution plan or expression and forget to add it (nothing forces you to call a 
new public function, moving the implements to the struct itself would allow 
destructuring which forces new fields to be handled).


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