flink-tests/src/test/java/org/apache/flink/test/operators/ProjectITCase.java

/*
 * 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.test.operators;

import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.api.java.tuple.Tuple5;
import org.apache.flink.test.operators.util.CollectionDataSets;
import org.apache.flink.test.util.JavaProgramTestBase;

import java.util.List;

/** Integration tests for {@link DataSet#project}. */
public class ProjectITCase extends JavaProgramTestBase {

    @Override
    protected void testProgram() throws Exception {
        /*
         * Projection with tuple fields indexes
         */

        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Tuple5<Integer, Long, Integer, String, Long>> ds =
                CollectionDataSets.get5TupleDataSet(env);
        DataSet<Tuple3<String, Long, Integer>> projDs = ds.project(3, 4, 2);
        List<Tuple3<String, Long, Integer>> result = projDs.collect();

        String expectedResult =
                "Hallo,1,0\n"
                        + "Hallo Welt,2,1\n"
                        + "Hallo Welt wie,1,2\n"
                        + "Hallo Welt wie gehts?,2,3\n"
                        + "ABC,2,4\n"
                        + "BCD,3,5\n"
                        + "CDE,2,6\n"
                        + "DEF,1,7\n"
                        + "EFG,1,8\n"
                        + "FGH,2,9\n"
                        + "GHI,1,10\n"
                        + "HIJ,3,11\n"
                        + "IJK,3,12\n"
                        + "JKL,2,13\n"
                        + "KLM,2,14\n";

        compareResultAsTuples(result, expectedResult);
    }
}