flink-tests/src/test/java/org/apache/flink/test/iterative/UnionStaticDynamicIterationITCase.java

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 * 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
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package org.apache.flink.test.iterative;

import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.io.LocalCollectionOutputFormat;
import org.apache.flink.api.java.operators.IterativeDataSet;
import org.apache.flink.test.util.JavaProgramTestBase;

import java.util.ArrayList;

import static org.junit.Assert.assertEquals;

/** Test union between static and dynamic path in an iteration. */
public class UnionStaticDynamicIterationITCase extends JavaProgramTestBase {

    private final ArrayList<Long> result = new ArrayList<Long>();

    @Override
    protected void testProgram() throws Exception {
        ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Long> inputStatic = env.generateSequence(1, 4);
        DataSet<Long> inputIteration = env.generateSequence(1, 4);

        IterativeDataSet<Long> iteration = inputIteration.iterate(3);

        DataSet<Long> result =
                iteration.closeWith(
                        inputStatic.union(inputStatic).union(iteration.union(iteration)));

        result.output(new LocalCollectionOutputFormat<Long>(this.result));

        env.execute();
    }

    @Override
    protected void postSubmit() throws Exception {
        assertEquals(88, result.size());
    }
}