xudong963 commented on code in PR #23319:
URL: https://github.com/apache/datafusion/pull/23319#discussion_r3524356965


##########
datafusion/physical-plan/src/joins/hash_join/shared_bounds.rs:
##########
@@ -754,6 +867,90 @@ mod tests {
         (partitions.clone(), *completed_partitions)
     }
 
+    #[test]
+    fn collect_left_updates_with_membership_only() {
+        let acc = make_collect_left_accumulator_for_test();
+
+        acc.build_filter(FinalizeInput::CollectLeft(reported(
+            in_list(&[1, 2, 3]),
+            no_bounds(),
+        )))
+        .unwrap();
+
+        let expr = current_expr(&acc);
+        in_list_expr(&expr);

Review Comment:
   after `in_list_expr(&expr)`, also asserting the child column and the in-list 
values are `[1,2,3]`  would be better.



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