flink-java/src/test/java/org/apache/flink/api/java/operator/ReduceOperatorTest.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.api.java.operator;

import org.apache.flink.api.common.functions.ReduceFunction;
import org.apache.flink.api.common.operators.SemanticProperties;
import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.functions.FunctionAnnotation;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.api.java.operators.ReduceOperator;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.tuple.Tuple5;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;

import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.assertTrue;

/**
 * Tests for {@link DataSet#reduce(ReduceFunction)}.
 */
@SuppressWarnings("serial")
public class ReduceOperatorTest {

	private final List<Tuple5<Integer, Long, String, Long, Integer>> emptyTupleData =
			new ArrayList<Tuple5<Integer, Long, String, Long, Integer>>();

	private final TupleTypeInfo<Tuple5<Integer, Long, String, Long, Integer>> tupleTypeInfo = new
			TupleTypeInfo<Tuple5<Integer, Long, String, Long, Integer>>(
					BasicTypeInfo.INT_TYPE_INFO,
					BasicTypeInfo.LONG_TYPE_INFO,
					BasicTypeInfo.STRING_TYPE_INFO,
					BasicTypeInfo.LONG_TYPE_INFO,
					BasicTypeInfo.INT_TYPE_INFO
			);

	@Test
	public void testSemanticPropsWithKeySelector1() {

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		ReduceOperator<Tuple5<Integer, Long, String, Long, Integer>> reduceOp =
				tupleDs.groupBy(new DummyTestKeySelector())
						.reduce(new DummyReduceFunction1());

		SemanticProperties semProps = reduceOp.getSemanticProperties();

		assertTrue(semProps.getForwardingTargetFields(0, 0).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 1).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 2).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 2).contains(4));
		assertTrue(semProps.getForwardingTargetFields(0, 3).size() == 2);
		assertTrue(semProps.getForwardingTargetFields(0, 3).contains(1));
		assertTrue(semProps.getForwardingTargetFields(0, 3).contains(3));
		assertTrue(semProps.getForwardingTargetFields(0, 4).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 4).contains(2));
		assertTrue(semProps.getForwardingTargetFields(0, 5).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 6).size() == 0);

		assertTrue(semProps.getForwardingSourceField(0, 0) < 0);
		assertTrue(semProps.getForwardingSourceField(0, 1) == 3);
		assertTrue(semProps.getForwardingSourceField(0, 2) == 4);
		assertTrue(semProps.getForwardingSourceField(0, 3) == 3);
		assertTrue(semProps.getForwardingSourceField(0, 4) == 2);

		assertTrue(semProps.getReadFields(0).size() == 3);
		assertTrue(semProps.getReadFields(0).contains(2));
		assertTrue(semProps.getReadFields(0).contains(5));
		assertTrue(semProps.getReadFields(0).contains(6));
	}

	@Test
	public void testSemanticPropsWithKeySelector2() {

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		ReduceOperator<Tuple5<Integer, Long, String, Long, Integer>> reduceOp =
				tupleDs.groupBy(new DummyTestKeySelector())
						.reduce(new DummyReduceFunction2())
							.withForwardedFields("0->4;1;1->3;2");

		SemanticProperties semProps = reduceOp.getSemanticProperties();

		assertTrue(semProps.getForwardingTargetFields(0, 0).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 1).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 2).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 2).contains(4));
		assertTrue(semProps.getForwardingTargetFields(0, 3).size() == 2);
		assertTrue(semProps.getForwardingTargetFields(0, 3).contains(1));
		assertTrue(semProps.getForwardingTargetFields(0, 3).contains(3));
		assertTrue(semProps.getForwardingTargetFields(0, 4).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 4).contains(2));
		assertTrue(semProps.getForwardingTargetFields(0, 5).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 6).size() == 0);

		assertTrue(semProps.getForwardingSourceField(0, 0) < 0);
		assertTrue(semProps.getForwardingSourceField(0, 1) == 3);
		assertTrue(semProps.getForwardingSourceField(0, 2) == 4);
		assertTrue(semProps.getForwardingSourceField(0, 3) == 3);
		assertTrue(semProps.getForwardingSourceField(0, 4) == 2);

		assertTrue(semProps.getReadFields(0).size() == 3);
		assertTrue(semProps.getReadFields(0).contains(2));
		assertTrue(semProps.getReadFields(0).contains(5));
		assertTrue(semProps.getReadFields(0).contains(6));
	}

	@Test
	public void testSemanticPropsWithKeySelector3() {

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		ReduceOperator<Tuple5<Integer, Long, String, Long, Integer>> reduceOp =
				tupleDs.groupBy(new DummyTestKeySelector())
						.reduce(new DummyReduceFunction3())
						.withForwardedFields("4->0;3;3->1;2");

		SemanticProperties semProps = reduceOp.getSemanticProperties();

		assertTrue(semProps.getForwardingTargetFields(0, 0).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 1).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 2).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 3).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 4).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 4).contains(2));
		assertTrue(semProps.getForwardingTargetFields(0, 5).size() == 2);
		assertTrue(semProps.getForwardingTargetFields(0, 5).contains(1));
		assertTrue(semProps.getForwardingTargetFields(0, 5).contains(3));
		assertTrue(semProps.getForwardingTargetFields(0, 6).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 6).contains(0));

		assertTrue(semProps.getForwardingSourceField(0, 0) == 6);
		assertTrue(semProps.getForwardingSourceField(0, 1) == 5);
		assertTrue(semProps.getForwardingSourceField(0, 2) == 4);
		assertTrue(semProps.getForwardingSourceField(0, 3) == 5);
		assertTrue(semProps.getForwardingSourceField(0, 4) < 0);

		assertTrue(semProps.getReadFields(0) == null);
	}

	@Test
	public void testSemanticPropsWithKeySelector4() {

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		ReduceOperator<Tuple5<Integer, Long, String, Long, Integer>> reduceOp =
				tupleDs.groupBy(new DummyTestKeySelector())
						.reduce(new DummyReduceFunction4());

		SemanticProperties semProps = reduceOp.getSemanticProperties();

		assertTrue(semProps.getForwardingTargetFields(0, 0).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 1).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 2).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 2).contains(0));
		assertTrue(semProps.getForwardingTargetFields(0, 3).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 3).contains(1));
		assertTrue(semProps.getForwardingTargetFields(0, 4).size() == 0);
		assertTrue(semProps.getForwardingTargetFields(0, 5).size() == 1);
		assertTrue(semProps.getForwardingTargetFields(0, 5).contains(3));
		assertTrue(semProps.getForwardingTargetFields(0, 6).size() == 0);

		assertTrue(semProps.getForwardingSourceField(0, 0) == 2);
		assertTrue(semProps.getForwardingSourceField(0, 1) == 3);
		assertTrue(semProps.getForwardingSourceField(0, 2) < 0);
		assertTrue(semProps.getForwardingSourceField(0, 3) == 5);
		assertTrue(semProps.getForwardingSourceField(0, 4) < 0);

		assertTrue(semProps.getReadFields(0) == null);
	}

	private static class DummyTestKeySelector implements KeySelector<Tuple5<Integer, Long, String, Long, Integer>, Tuple2<Long, Integer>> {
		@Override
		public Tuple2<Long, Integer> getKey(Tuple5<Integer, Long, String, Long, Integer> value) throws Exception {
			return new Tuple2<Long, Integer>();
		}
	}

	@FunctionAnnotation.ForwardedFields("0->4;1;1->3;2")
	@FunctionAnnotation.ReadFields("0;3;4")
	private static class DummyReduceFunction1 implements ReduceFunction<Tuple5<Integer, Long, String, Long, Integer>> {
		@Override
		public Tuple5<Integer, Long, String, Long, Integer> reduce(Tuple5<Integer, Long, String, Long, Integer> v1,
																	Tuple5<Integer, Long, String, Long, Integer> v2) throws Exception {
			return new Tuple5<Integer, Long, String, Long, Integer>();
		}
	}

	@FunctionAnnotation.ReadFields("0;3;4")
	private static class DummyReduceFunction2 implements ReduceFunction<Tuple5<Integer, Long, String, Long, Integer>> {
		@Override
		public Tuple5<Integer, Long, String, Long, Integer> reduce(Tuple5<Integer, Long, String, Long, Integer> v1,
																	Tuple5<Integer, Long, String, Long, Integer> v2) throws Exception {
			return new Tuple5<Integer, Long, String, Long, Integer>();
		}
	}

	private static class DummyReduceFunction3 implements ReduceFunction<Tuple5<Integer, Long, String, Long, Integer>> {
		@Override
		public Tuple5<Integer, Long, String, Long, Integer> reduce(Tuple5<Integer, Long, String, Long, Integer> v1,
																	Tuple5<Integer, Long, String, Long, Integer> v2) throws Exception {
			return new Tuple5<Integer, Long, String, Long, Integer>();
		}
	}

	@FunctionAnnotation.NonForwardedFields("2;4")
	private static class DummyReduceFunction4 implements ReduceFunction<Tuple5<Integer, Long, String, Long, Integer>> {
		@Override
		public Tuple5<Integer, Long, String, Long, Integer> reduce(Tuple5<Integer, Long, String, Long, Integer> v1,
																	Tuple5<Integer, Long, String, Long, Integer> v2) throws Exception {
			return new Tuple5<Integer, Long, String, Long, Integer>();
		}
	}
}