alamb commented on issue #12819:
URL: https://github.com/apache/datafusion/issues/12819#issuecomment-2430176290

   > When, in the creation/execution path, do you mean re-compute the 
return_type? At invoke time?
   
   Yes
   
   
   > invoke is given a [ColumnarValue]) which is missing the necessarily type 
information to reconstruct the type 
   
   I think you can get it from: 
https://docs.rs/datafusion/latest/datafusion/logical_expr/enum.ColumnarValue.html#method.data_type


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