tustvold commented on code in PR #2246:
URL: https://github.com/apache/arrow-datafusion/pull/2246#discussion_r854030100


##########
ballista/rust/core/src/serde/logical_plan/mod.rs:
##########
@@ -1016,6 +1016,55 @@ mod roundtrip_tests {
                 "this is only a test object store".to_string(),
             ))
         }
+
+        fn file_writer(
+            &self,
+            _path: &str,
+        ) -> datafusion_data_access::Result<Arc<dyn ObjectWriter>> {
+            unimplemented!();
+        }
+
+        async fn create_dir(
+            &self,
+            _path: &str,
+            _recursive: bool,
+        ) -> datafusion_data_access::Result<()> {
+            unimplemented!();
+        }
+
+        async fn remove_dir_all(
+            &self,
+            _path: &str,
+        ) -> datafusion_data_access::Result<()> {
+            unimplemented!();
+        }
+
+        async fn remove_dir_contents(
+            &self,
+            _path: &str,
+        ) -> datafusion_data_access::Result<()> {
+            unimplemented!();
+        }
+
+        async fn remove_file(&self, _path: &str) -> 
datafusion_data_access::Result<()> {
+            unimplemented!();
+        }
+
+        async fn rename(

Review Comment:
   https://doc.rust-lang.org/book/ch10-02-traits.html#default-implementations



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