jklamer commented on a change in pull request #1602:
URL: https://github.com/apache/avro/pull/1602#discussion_r826450904



##########
File path: lang/rust/avro/src/encode.rs
##########
@@ -496,4 +495,268 @@ mod tests {
         encode(&outer_value2, &schema, &mut buf);
         assert!(!buf.is_empty());
     }
+
+    #[test]
+    fn test_avro_3448_proper_multi_level_encoding_outer_namespace() {
+        let schema = r#"
+        {
+          "name": "record_name",
+          "namespace": "space",
+          "type": "record",
+          "fields": [
+            {
+              "name": "outer_field_1",
+              "type": [
+                        "null",
+                        {
+                            "type": "record",
+                            "name": "middle_record_name",
+                            "fields":[
+                                {
+                                    "name":"middle_field_1",
+                                    "type":[
+                                        "null",
+                                        {
+                                            "type":"record",
+                                            "name":"inner_record_name",
+                                            "fields":[
+                                                {
+                                                    "name":"inner_field_1",
+                                                    "type":"double"
+                                                }
+                                            ]
+                                        }
+                                    ]
+                                }
+                            ]
+                        }
+                    ]
+            },
+            {
+                "name": "outer_field_2",
+                "type" : "space.inner_record_name"
+            }
+          ]
+        }
+        "#;
+        let schema = Schema::parse_str(schema).unwrap();
+        let inner_record = Value::Record(vec![("inner_field_1".into(), 
Value::Double(5.4))]);
+        let middle_record_variation_1 = Value::Record(vec![(
+            "middle_field_1".into(),
+            Value::Union(0, Box::new(Value::Null)),
+        )]);
+        let middle_record_variation_2 = Value::Record(vec![(
+            "middle_field_1".into(),
+            Value::Union(1, Box::new(inner_record.clone())),
+        )]);
+        let outer_record_variation_1 = Value::Record(vec![
+            (
+                "outer_field_1".into(),
+                Value::Union(0, Box::new(Value::Null)),
+            ),
+            ("outer_field_2".into(), inner_record.clone()),
+        ]);
+        let outer_record_variation_2 = Value::Record(vec![
+            (
+                "outer_field_1".into(),
+                Value::Union(1, Box::new(middle_record_variation_1)),
+            ),
+            ("outer_field_2".into(), inner_record.clone()),
+        ]);
+        let outer_record_variation_3 = Value::Record(vec![
+            (
+                "outer_field_1".into(),
+                Value::Union(1, Box::new(middle_record_variation_2)),
+            ),
+            ("outer_field_2".into(), inner_record),
+        ]);
+
+        // TODO add in error result wrapping to encoding flow

Review comment:
       Right now encoding doesn't return anything when I believe it should 
return AvroResult<()> with proper error message. I believe we are in alignment. 
My code comment wasn't clear. 




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