showuon commented on a change in pull request #11124:
URL: https://github.com/apache/kafka/pull/11124#discussion_r678903334



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamSlidingWindowAggregate.java
##########
@@ -351,7 +351,8 @@ private void processEarly(final K key, final V value, final 
long inputRecordTime
             }
 
             if (combinedWindow == null) {
-                final TimeWindow window = new TimeWindow(0, 
windows.timeDifferenceMs());
+                // created a [start, end] time interval window via 
SessionWindow
+                final SessionWindow window = new SessionWindow(0, 
windows.timeDifferenceMs());

Review comment:
       add a comment here to avoid confusion.




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