pepijnve commented on issue #20585:
URL: https://github.com/apache/datafusion/issues/20585#issuecomment-3991615245

   > Ideally, all functions that consume strings and return the same will 
return values in the same data type as the primary
   
   @Omega359 could you elaborate on why that is the ideal situation? I tend to 
agree with @Rafferty97 that making `input_type == output_type` a hard rule 
might have unintended performance consequences.


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