liukun4515 commented on code in PR #3721:
URL: https://github.com/apache/arrow-datafusion/pull/3721#discussion_r988916394


##########
datafusion/optimizer/src/type_coercion.rs:
##########
@@ -398,6 +398,20 @@ impl ExprRewriter for TypeCoercionRewriter {
                     }
                 }
             }
+            Expr::ScalarFunction { fun, args } => match fun {
+                BuiltinScalarFunction::Concat
+                | BuiltinScalarFunction::ConcatWithSeparator => {
+                    let new_args = args

Review Comment:
   Yes, we can do it in the 
https://github.com/apache/arrow-datafusion/issues/3582#issuecomment-1254441358
   
   And this pr can be merged first.



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