notfilippo commented on PR #22572:
URL: https://github.com/apache/datafusion/pull/22572#issuecomment-4582278388

   > My only concern (which I will have to find as I go into the details) is 
whether or not we are able to adequately capture the more subtle details of 
function definitions (e.g. nullability handling, variadic behavior, any<N> type 
parameter binding)
   
   @benbellick , I've already included a system of manual overrides to extend 
the contract when the contextual information of a UDF is not enough. I think it 
satisfies your concerns.


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