jayzhan211 commented on PR #10391:
URL: https://github.com/apache/datafusion/pull/10391#issuecomment-2097141130

   @alamb This change is based on what the built-in function does, and what we 
need for UDAF to have the same behavior. If the change is not clear if it is 
necessary, we can also change it when moving the function to UDAF gradually.
   
   This PR exists because 1. breaking API changes at once, so we don't need to 
keep breaking API after that. 2. Split the change out can also reduce the 
review size of other functions moving (but less straightforward if the change 
is worth it)
   
   if we found out there is a better way to rewrite what the current builtin 
function does, the change here might be useless, so I think both way has pros 
and cons


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