yunfengzhou-hub commented on code in PR #23927:
URL: https://github.com/apache/flink/pull/23927#discussion_r1452009484


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flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/ResultSubpartitionIndexSet.java:
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@@ -0,0 +1,73 @@
+/*
+ * 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.flink.runtime.io.network.partition;
+
+import org.apache.flink.runtime.executiongraph.IndexRange;
+
+import org.apache.flink.shaded.netty4.io.netty.buffer.ByteBuf;
+
+import java.util.Iterator;
+
+/** A collection of subpartition indexes. */
+public class ResultSubpartitionIndexSet extends IndexRange {

Review Comment:
   In future we may need to dynamically assign subpartitions to an input 
channel during runtime, in which case the index of the subpartitions may not be 
adjacent to each other. The IndexSet naming could offer a abstraction that is 
general enough for these future uses.



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