AHeise commented on a change in pull request #11467: [FLINK-16317][operators] 
Provide support for watermarks, key selector and latency marker in 
URL: https://github.com/apache/flink/pull/11467#discussion_r397004890

 File path: 
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+ * 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.
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+ */
+package org.apache.flink.streaming.api.transformations;
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.dag.Transformation;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.streaming.api.operators.StreamOperatorFactory;
+import java.util.ArrayList;
+import java.util.List;
+ * {@link AbstractMultipleInputTransformation} implementation for keyed 
+ */
+public class KeyedMultipleInputTransformation<OUT> extends 
AbstractMultipleInputTransformation<OUT> {
 Review comment:
   Can't that extend `MultipleInputTransformation` to get rid of 

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