timsaucer commented on code in PR #21240:
URL: https://github.com/apache/datafusion/pull/21240#discussion_r3065564984


##########
datafusion/proto/src/physical_plan/mod.rs:
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@@ -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:
   This feels like a bit of an anti-pattern. I'm going to need a bit of time to 
dive into what's going on here, but hopefully will get to it either this 
afternoon or maybe Sunday evening.



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