jayzhan211 commented on issue #9098:
URL: 
https://github.com/apache/arrow-datafusion/issues/9098#issuecomment-1922589945

   The reason that we got UTF8 is that the signature of coalesce contains UTF8 
and both null and list(i64) can be coerced into UTF8.
   
   We should fix the signature of Coalesce and coercion rule `fn coerced_from`.


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