[GitHub] [kafka] mjsax commented on a change in pull request #11617: KAFKA-13557: Remove swapResult from the public API

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mjsax commented on a change in pull request #11617:
URL: https://github.com/apache/kafka/pull/11617#discussion_r772606055



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File path: streams/src/main/java/org/apache/kafka/streams/query/InternalQueryResultUtil.java
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@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.streams.query;
+
+import org.apache.kafka.common.annotation.InterfaceStability.Unstable;
+
+import java.util.List;
+
+/**
+ * This utility class is an internal API, but it must be located in the same package as
+ * {@link QueryResult} so that it can access the package-private constructor

Review comment:
       I would prefer to move this class into an internal package and make the constructor of QueryResult `public` -- it won't be useful for KS devs, but it also does not hurt if we allow them to create a `QueryResult`?
   
   Or should we extend `QueryResult` ? (Btw: why is `QueryResult` not an interface?)




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