guozhangwang commented on a change in pull request #11582:
URL: https://github.com/apache/kafka/pull/11582#discussion_r771744164



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/StoreQueryUtils.java
##########
@@ -162,15 +163,39 @@ public static boolean isPermitted(
             }
             final R result = (R) iterator;
             return QueryResult.forResult(result);
-        } catch (final Throwable t) {
-            final String message = parseStoreException(t, store, query);
+        } catch (final Exception e) {
+            final String message = parseStoreException(e, store, query);
             return QueryResult.forFailure(
                 FailureReason.STORE_EXCEPTION,
                 message
             );
         }
     }
 
+    @SuppressWarnings("unchecked")
+    private static <R> QueryResult<R> runKeyQuery(final Query<R> query,
+                                                  final PositionBound 
positionBound,
+                                                  final boolean 
collectExecutionInfo,
+                                                  final StateStore store) {
+        if (store instanceof KeyValueStore) {
+            final KeyQuery<Bytes, byte[]> rawKeyQuery = (KeyQuery<Bytes, 
byte[]>) query;
+            final KeyValueStore<Bytes, byte[]> keyValueStore =
+                (KeyValueStore<Bytes, byte[]>) store;
+            try {
+                final byte[] bytes = keyValueStore.get(rawKeyQuery.getKey());
+                return (QueryResult<R>) QueryResult.forResult(bytes);

Review comment:
       @vvcephei but in this PR at least, `Should we use swap here as well?`?




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