jayzhan211 commented on PR #14532:
URL: https://github.com/apache/datafusion/pull/14532#issuecomment-2641836978

   See this, 
https://github.com/apache/datafusion/issues/13819#issuecomment-2552554818.
   We only convert an inner fixed-size list to a regular list when the function 
performs a mutation operation, such as `array_append`. For non-mutation 
operations, like `array_element`, we keep T as a fixed-size list


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