alamb commented on code in PR #15921:
URL: https://github.com/apache/datafusion/pull/15921#discussion_r2071475600


##########
datafusion/spark/src/function/utils.rs:
##########
@@ -67,7 +69,12 @@ pub mod test {
                     let return_field = return_field.unwrap();
                     assert_eq!(return_field.data_type(), &$EXPECTED_DATA_TYPE);
 
-                    let result = 
func.invoke_with_args(datafusion_expr::ScalarFunctionArgs{args: $ARGS, 
number_rows: cardinality, return_field: &return_field, arg_fields: 
arg_fields_owned.iter().collect()});
+                    let result = 
func.invoke_with_args(datafusion_expr::ScalarFunctionArgs{
+                        args: $ARGS,
+                        number_rows: cardinality,
+                        return_field: &return_field,
+                        arg_fields: arg_fields.clone(),

Review Comment:
   it is actually somewhat unfortunate that this need to be `clone` -- I will 
propose a small follow on to try and avoid this



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