Re: [I] Access children `DataType` or return-type in `ScalarUDFImpl::invoke` [datafusion]

["findepi (via GitHub)" <gi...@apache.org>]

findepi commented on issue #12819:
URL: https://github.com/apache/datafusion/issues/12819#issuecomment-2401937768

   You may want to implement `ScalarUDFImpl::simplify` which is given nullability info.
   From there you'd return a  new  `ScalarUDFImpl` instance with the nullability information stored on a field. 
   When the information is already stored, subsequent `simplify` call (if any), should return original expression.
   Let me know if it works for your case.
   
   At some point we could probably rename `simplify` to `specialize` cc @alamb 
   
   


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