jayshrivastava commented on code in PR #21807:
URL: https://github.com/apache/datafusion/pull/21807#discussion_r3134571155


##########
datafusion/proto/src/physical_plan/mod.rs:
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@@ -3839,85 +3836,16 @@ impl PhysicalProtoConverterExtension for 
DefaultPhysicalProtoConverter {
     }
 }
 
-/// Internal serializer that adds expr_id to expressions.
-/// Created fresh for each serialization operation.
-struct DeduplicatingSerializer {

Review Comment:
   Since the DynamicFilterPhysicalExpr self-generates an expr id and exposes it 
via expression_id, we don't need this anymore. We can just dedupe during 
deserialization.



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