hequn8128 commented on a change in pull request #13155:
URL: https://github.com/apache/flink/pull/13155#discussion_r471450438



##########
File path: 
flink-python/src/test/java/org/apache/flink/python/util/PartitionCustomTestMapFunction.java
##########
@@ -0,0 +1,43 @@
+/*
+ * 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.python.util;
+
+import org.apache.flink.api.common.functions.RichMapFunction;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.types.Row;
+
+/**
+ * {@link PartitionCustomTestMapFunction} is a dedicated MapFunction to make 
sure the specific field data is equal to
+ * current sub-task index.
+ */
+public class PartitionCustomTestMapFunction extends RichMapFunction<Row, Row> {
+
+       private int currentTaskIndex;
+
+       @Override
+       public void open(Configuration parameters) {
+               this.currentTaskIndex = 
getRuntimeContext().getIndexOfThisSubtask();
+       }
+
+       @Override
+       public Row map(Row value) throws Exception {
+               assert value.getField(1).equals(currentTaskIndex);

Review comment:
       you need to turn on the -ea switch (enable assertions), otherwise no 
assert instructions will be run by the JVM at all




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