Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5836#discussion_r185942219
--- Diff:
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/datastream/SplitSideOutputTest.java
---
@@ -0,0 +1,75 @@
+/*
+ * 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.streaming.api.datastream;
+
+import
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.ProcessFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.util.OutputTag;
+
+import org.junit.Test;
+
+import java.util.Collections;
+
+/**
+ * Tests that verify correct behavior when applying split/getSideOutput
operations on one {@link DataStream}.
+ */
+public class SplitSideOutputTest {
+
+ private static final OutputTag<String> outputTag = new
OutputTag<String>("outputTag") {};
+
+ @Test
+ public void testSideOutputAfterSelectIsForbidden() {
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+ SingleOutputStreamOperator<String> processInput =
env.fromElements("foo")
+ .process(new DummyProcessFunction());
+
+ processInput.split(Collections::singleton);
+
+ try {
+ processInput.getSideOutput(outputTag);
+ } catch (UnsupportedOperationException expected){
+ // expected
+ }
+ }
+
+ @Test
+ public void testSelectAfterSideOutputIsForbidden() {
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+ SingleOutputStreamOperator<String> processInput =
env.fromElements("foo")
+ .process(new DummyProcessFunction());
+
+ processInput.getSideOutput(outputTag);
+
+ try {
+ processInput.split(Collections::singleton);
--- End diff --
same as above
---
