neilconway commented on code in PR #21240:
URL: https://github.com/apache/datafusion/pull/21240#discussion_r3006626451


##########
datafusion/proto/src/physical_plan/mod.rs:
##########
@@ -3792,7 +3894,11 @@ struct DataEncoderTuple {
     pub blob: Vec<u8>,
 }
 
-pub struct DefaultPhysicalProtoConverter;
+#[derive(Default)]
+pub struct DefaultPhysicalProtoConverter {
+    scalar_subquery_results: RefCell<Option<ScalarSubqueryResults>>,

Review Comment:
   I don't know the serialization/deserialization code well; would love 
feedback on whether this is the right way to do this.



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