junjunjd commented on code in PR #7901:
URL: https://github.com/apache/arrow-datafusion/pull/7901#discussion_r1379688238


##########
datafusion/common/src/scalar.rs:
##########
@@ -676,13 +696,13 @@ macro_rules! build_values_list {
                     ScalarValue::$SCALAR_TY(None) => {
                         builder.values().append_null();
                     }
-                    _ => panic!("Incompatible ScalarValue for list"),

Review Comment:
   I agree this error can be unreachable if invariant is established that the 
`data_type` and `values` arguments passed to 
[`new_list`](https://github.com/apache/arrow-datafusion/blob/main/datafusion/common/src/scalar.rs#L1664)
 align with each other. 
   I will change this back to `panic` and thus making `new_list` panic instead 
of returning `Result`.



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