jonahgao commented on code in PR #9297:
URL: https://github.com/apache/arrow-datafusion/pull/9297#discussion_r1498544669


##########
datafusion/proto/proto/datafusion.proto:
##########
@@ -545,7 +545,7 @@ message InListNode {
 
 enum ScalarFunction {
   Abs = 0;
-  Acos = 1;
+  // 1 was Acos

Review Comment:
   Should we consider keeping it, perhaps by renaming it to Deprecated_Acos, 
and then decode it into the new ScalarUDF to maintain better backward 
compatibility?  
   
   We might need to mark the `BuiltinScalarFunction::Acos` as deprecated as 
well.



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