dima5rr commented on a change in pull request #8706:
URL: https://github.com/apache/kafka/pull/8706#discussion_r431687179



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/QueryableStoreProvider.java
##########
@@ -58,9 +58,21 @@ public QueryableStoreProvider(final 
List<StreamThreadStateStoreProvider> storePr
         }
         final List<T> allStores = new ArrayList<>();
         for (final StreamThreadStateStoreProvider storeProvider : 
storeProviders) {
-            allStores.addAll(storeProvider.stores(storeQueryParameters));
+            final List<T> stores = storeProvider.stores(storeQueryParameters);
+            if (stores != null && !stores.isEmpty()) {
+                allStores.addAll(stores);
+                if (storeQueryParameters.partition() != null) {
+                    break;
+                }
+            }
         }
         if (allStores.isEmpty()) {
+            if (storeQueryParameters.partition() != null) {

Review comment:
       I extended StateStoreProviderStub functionality to add store by 
partition with default partition 0, + relevant tests in 
QueryableStoreProviderTest




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