Blizzara commented on code in PR #13647:
URL: https://github.com/apache/datafusion/pull/13647#discussion_r1873185289


##########
datafusion/substrait/src/logical_plan/producer.rs:
##########
@@ -2422,6 +2424,20 @@ mod test {
         Ok(())
     }
 
+    #[test]
+    fn to_field_reference() -> Result<()> {
+        let expression = substrait_field_ref(2)?;
+
+        match &expression.rex_type {
+            Some(RexType::Selection(field_ref)) => {
+                assert_ne!(field_ref.root_type, None);

Review Comment:
   would this work?
   ```suggestion
                   assert_eq!(field_ref.root_type.expect("root type should be 
set"), RootType::RootReference(RootReference {}));
   ```



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