adriangb commented on code in PR #20416:
URL: https://github.com/apache/datafusion/pull/20416#discussion_r2842048151
##########
datafusion/proto/src/physical_plan/mod.rs:
##########
@@ -3818,6 +3822,18 @@ impl DeduplicatingSerializer {
session_id: rand::random(),
}
}
+
+ fn hash(&self, ptr: u64) -> u64 {
+ // Hash session_id, pointer address, and process ID together to create
expr_id.
+ // - session_id: random per serializer, prevents collisions when
merging serializations
+ // - ptr: unique address per Arc within a process
+ // - pid: prevents collisions if serializer is shared across processes
+ let mut hasher = DefaultHasher::new();
+ self.session_id.hash(&mut hasher);
+ ptr.hash(&mut hasher);
+ std::process::id().hash(&mut hasher);
+ hasher.finish()
+ }
}
impl PhysicalProtoConverterExtension for DeduplicatingSerializer {
Review Comment:
I thought DeduplicatingSerializer already handled dynamic filters without
any further work?
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