jayzhan211 commented on PR #13756:
URL: https://github.com/apache/datafusion/pull/13756#issuecomment-2544423933

   > > Given that we coerce fixed size list to list, the return type of 
`array_element(fixed size list)` makes sense to be list.
   > 
   > in the unit test, we ask for `array_element(list(fixed size list))` and we 
expect the return type to be `fixed size list`. in the fix, we make so that 
`array_element(list(T))` always returns `T`.
   
   The idea to coerce fixed size list to list is to simplify the logic to 
handle both kinds of list. Unless this leads to issue otherwise I think we 
should keep this aggressive coercion.


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