andygrove commented on code in PR #3365:
URL: https://github.com/apache/arrow-datafusion/pull/3365#discussion_r964067463


##########
datafusion/proto/src/to_proto.rs:
##########
@@ -962,10 +965,10 @@ impl TryFrom<&ScalarValue> for protobuf::ScalarValue {
                             let scalar_type = match boxed_field.data_type() {
                                 DataType::List(field) => 
field.as_ref().data_type(),
                                 unsupported => {
-                                    todo!("Proper error handling {}", 
unsupported)
+                                    return Err(Error::General(format!("Proto 
serialization error: {:?} not supported to convert to DataType::List", 
unsupported)));
                                 }
                             };
-                            println!("Current scalar type for list: {:?}", 
scalar_type);
+                            //println!("Current scalar type for list: {:?}", 
scalar_type);

Review Comment:
   Debug logging can be removed



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