ableegoldman commented on a change in pull request #9039:
URL: https://github.com/apache/kafka/pull/9039#discussion_r465379071



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/kstream/internals/CogroupedStreamAggregateBuilder.java
##########
@@ -132,16 +135,19 @@
                                                                                
     final boolean stateCreated,
                                                                                
     final StoreBuilder<?> storeBuilder,
                                                                                
     final Windows<W> windows,
+                                                                               
     final SlidingWindows slidingWindows,
                                                                                
     final SessionWindows sessionWindows,
                                                                                
     final Merger<? super K, VOut> sessionMerger) {
 
         final ProcessorSupplier<K, ?> kStreamAggregate;
 
-        if (windows == null && sessionWindows == null) {
+        if (windows == null && slidingWindows == null && sessionWindows == 
null) {
             kStreamAggregate = new KStreamAggregate<>(storeBuilder.name(), 
initializer, aggregator);
-        } else if (windows != null && sessionWindows == null) {
+        } else if (windows != null && slidingWindows == null && sessionWindows 
== null) {
             kStreamAggregate = new KStreamWindowAggregate<>(windows, 
storeBuilder.name(), initializer, aggregator);
-        } else if (windows == null && sessionMerger != null) {
+        } else if (windows == null && slidingWindows != null && sessionWindows 
== null) {
+            kStreamAggregate = new 
KStreamSlidingWindowAggregate<>(slidingWindows, storeBuilder.name(), 
initializer, aggregator);
+        } else if (windows == null && slidingWindows == null && sessionMerger 
!= null) {

Review comment:
       Not saying all this needs to be cleaned up in this PR. If we check one 
thing (eg `sessionMerger`) then we should check everything (eg `sessionMerged 
!= null && sessionWindows != null`). We can decide whether we really need to 
check anything as followup 




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