jayzhan211 commented on code in PR #10807:
URL: https://github.com/apache/datafusion/pull/10807#discussion_r1630411768


##########
datafusion/optimizer/src/common_subexpr_eliminate.rs:
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@@ -861,105 +861,6 @@ mod test {
         assert_eq!(expected, formatted_plan);
     }
 
-    #[test]
-    fn id_array_visitor() -> Result<()> {

Review Comment:
   > for example we could add a sum() AggregateUDF that had the same signature 
as sum
   
   Introduce another similar function for test only increase the maintain cost 
unless they are not changed frequently 🤔 



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