findepi commented on issue #13716:
URL: https://github.com/apache/datafusion/issues/13716#issuecomment-2535240527

   > Should we deprecate this function if it is no longer the correct approach 
for determining UDF return types? It looks like `return_type_from_exprs` should 
now be used instead?
   
   Short term yes
   
   Long term -- the UDF weaved into the plan should know it's return type. It's 
wasteful to recalculate it over again. 
https://github.com/apache/datafusion/issues/12604


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