mjsax commented on a change in pull request #11582:
URL: https://github.com/apache/kafka/pull/11582#discussion_r771737576



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredKeyValueStore.java
##########
@@ -186,6 +203,68 @@ public boolean setFlushListener(final 
CacheFlushListener<K, V> listener,
         return false;
     }
 
+    @SuppressWarnings("unchecked")
+    @Override
+    public <R> QueryResult<R> query(final Query<R> query,
+        final PositionBound positionBound,
+        final boolean collectExecutionInfo) {
+
+        final long start = System.nanoTime();
+        final QueryResult<R> result;
+
+        final QueryHandler handler = queryHandlers.get(query.getClass());
+        if (handler == null) {
+            result = wrapped().query(query, positionBound, 
collectExecutionInfo);
+            if (collectExecutionInfo) {
+                result.addExecutionInfo(
+                    "Handled in " + getClass() + " in " + (System.nanoTime() - 
start) + "ns");
+            }
+        } else {
+            result = (QueryResult<R>) handler.apply(
+                query,
+                positionBound,
+                collectExecutionInfo,
+                this
+            );
+            if (collectExecutionInfo) {
+                result.addExecutionInfo(
+                    "Handled in " + getClass() + " with serdes "
+                        + serdes + " in " + (System.nanoTime() - start) + 
"ns");
+            }
+        }
+        return result;
+    }
+
+    @SuppressWarnings("unchecked")
+    private <R> QueryResult<R> runKeyQuery(final Query query,
+        final PositionBound positionBound, final boolean collectExecutionInfo) 
{
+        final QueryResult<R> result;
+        final KeyQuery<K, V> typedQuery = (KeyQuery<K, V>) query;
+        final KeyQuery<Bytes, byte[]> rawKeyQuery = 
KeyQuery.withKey(keyBytes(typedQuery.getKey()));
+        final QueryResult<byte[]> rawResult =
+            wrapped().query(rawKeyQuery, positionBound, collectExecutionInfo);
+        if (rawResult.isSuccess()) {
+            final boolean timestamped = 
WrappedStateStore.isTimestamped(wrapped());

Review comment:
       > Also, because we always wrap the non-timestamped store with the 
KeyValueToTimestampedKeyValueByteStoreAdapter, we also always pass through the 
MeteredTimestampedKeyValue store whether the inner store is really timestamped 
or not.
   
   I don't think so. We only do this in the DSL, but not the PAPI.




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