1fanwang commented on code in PR #5222:
URL: https://github.com/apache/calcite/pull/5222#discussion_r3875130296


##########
core/src/test/java/org/apache/calcite/test/enumerable/EnumerableSortedAggregateTest.java:
##########
@@ -74,6 +74,40 @@ public class EnumerableSortedAggregateTest {
         .throws_("There are not enough rules to produce a node with desired 
properties");
   }
 
+  /** Test case for
+   * <a 
href="https://issues.apache.org/jira/browse/CALCITE-6089";>[CALCITE-6089]
+   * EnumerableSortedAggregate fails with ClassCastException: class X cannot be
+   * cast to class org.apache.calcite.runtime.FlatLists$ComparableList</a>.
+   *
+   * <p>The aggregate has no group key, so since

Review Comment:
   ack, dropped the reference



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