kosiew commented on code in PR #24813:
URL: https://github.com/apache/datafusion/pull/24813#discussion_r3947578226


##########
datafusion/proto/src/physical_plan/mod.rs:
##########
@@ -374,6 +400,55 @@ mod file_scan_config_serde {
         Ok(())
     }
 
+    #[test]
+    fn new_file_scan_config_serde_preserves_explicit_order_flag() -> 
Result<()> {

Review Comment:
   Optional: could we add protobuf JSON coverage for `preserve_order: 
Some(false)` and the legacy case where the field is absent? The `json` feature 
supports this representation, and the generated `pbjson` code preserves the 
distinction between an explicit `false` and an absent value.
   
   I think this would be useful for protecting the generated JSON/codegen 
contract. A test in `datafusion-proto-models` compiled with its `json` feature 
would probably be the best place for it, rather than testing the handwritten 
serde path here. Not required for this PR.



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