adriangb commented on code in PR #19300:
URL: https://github.com/apache/datafusion/pull/19300#discussion_r2615212727
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datafusion/proto/src/physical_plan/to_proto.rs:
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@@ -227,6 +228,30 @@ pub fn serialize_physical_expr(
let value = snapshot_physical_expr(Arc::clone(value))?;
let expr = value.as_any();
+ // HashTableLookupExpr is used for dynamic filter pushdown in hash joins.
Review Comment:
Yes I agree
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