/*
* 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.javaApiOperators;
import java.util.List;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.functions.RichMapFunction;
import org.apache.flink.api.java.tuple.Tuple1;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.api.java.tuple.Tuple5;
import org.apache.flink.test.javaApiOperators.util.CollectionDataSets;
import org.apache.flink.test.javaApiOperators.util.CollectionDataSets.CustomType;
import org.apache.flink.test.javaApiOperators.util.CollectionDataSets.POJO;
import org.apache.flink.test.util.MultipleProgramsTestBase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
@SuppressWarnings("serial")
@RunWith(Parameterized.class)
public class DistinctITCase extends MultipleProgramsTestBase {
public DistinctITCase(TestExecutionMode mode){
super(mode);
}
@Test
public void testCorrectnessOfDistinctOnTuplesWithKeyFieldSelector() throws Exception {
/*
* check correctness of distinct on tuples with key field selector
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple3<Integer, Long, String>> ds = CollectionDataSets.getSmall3TupleDataSet(env);
DataSet<Tuple3<Integer, Long, String>> distinctDs = ds.union(ds).distinct(0, 1, 2);
List<Tuple3<Integer, Long, String>> result = distinctDs.collect();
String expected = "1,1,Hi\n" +
"2,2,Hello\n" +
"3,2,Hello world\n";
compareResultAsTuples(result, expected);
}
@Test
public void testCorrectnessOfDistinctOnTuplesWithKeyFieldSelectorWithNotAllFieldsSelected() throws Exception{
/*
* check correctness of distinct on tuples with key field selector with not all fields selected
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple5<Integer, Long, Integer, String, Long>> ds = CollectionDataSets.getSmall5TupleDataSet(env);
DataSet<Tuple1<Integer>> distinctDs = ds.union(ds).distinct(0).project(0);
List<Tuple1<Integer>> result = distinctDs.collect();
String expected = "1\n" +
"2\n";
compareResultAsTuples(result, expected);
}
@Test
public void testCorrectnessOfDistinctOnTuplesWithKeyExtractorFunction() throws Exception {
/*
* check correctness of distinct on tuples with key extractor function
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple5<Integer, Long, Integer, String, Long>> ds = CollectionDataSets.getSmall5TupleDataSet(env);
DataSet<Tuple1<Integer>> reduceDs = ds.union(ds).distinct(new KeySelector1()).project(0);
List<Tuple1<Integer>> result = reduceDs.collect();
String expected = "1\n" + "2\n";
compareResultAsTuples(result, expected);
}
public static class KeySelector1 implements KeySelector<Tuple5<Integer, Long, Integer, String, Long>, Integer> {
private static final long serialVersionUID = 1L;
@Override
public Integer getKey(Tuple5<Integer, Long, Integer, String, Long> in) {
return in.f0;
}
}
@Test
public void testCorrectnessOfDistinctOnCustomTypeWithTypeExtractor() throws Exception {
/*
* check correctness of distinct on custom type with type extractor
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<CustomType> ds = CollectionDataSets.getCustomTypeDataSet(env);
DataSet<Tuple1<Integer>> reduceDs = ds
.distinct(new KeySelector3())
.map(new Mapper3());
List<Tuple1<Integer>> result = reduceDs.collect();
String expected = "1\n" +
"2\n" +
"3\n" +
"4\n" +
"5\n" +
"6\n";
compareResultAsTuples(result, expected);
}
public static class Mapper3 extends RichMapFunction<CustomType, Tuple1<Integer>> {
@Override
public Tuple1<Integer> map(CustomType value) throws Exception {
return new Tuple1<Integer>(value.myInt);
}
}
public static class KeySelector3 implements KeySelector<CustomType, Integer> {
private static final long serialVersionUID = 1L;
@Override
public Integer getKey(CustomType in) {
return in.myInt;
}
}
@Test
public void testCorrectnessOfDistinctOnTuples() throws Exception{
/*
* check correctness of distinct on tuples
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple3<Integer, Long, String>> ds = CollectionDataSets.getSmall3TupleDataSet(env);
DataSet<Tuple3<Integer, Long, String>> distinctDs = ds.union(ds).distinct();
List<Tuple3<Integer, Long, String>> result = distinctDs.collect();
String expected = "1,1,Hi\n" +
"2,2,Hello\n" +
"3,2,Hello world\n";
compareResultAsTuples(result, expected);
}
@Test
public void testCorrectnessOfDistinctOnCustomTypeWithTupleReturningTypeExtractor() throws Exception{
/*
* check correctness of distinct on custom type with tuple-returning type extractor
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple5<Integer, Long, Integer, String, Long>> ds = CollectionDataSets.get5TupleDataSet(env);
DataSet<Tuple2<Integer, Long>> reduceDs = ds
.distinct(new KeySelector2())
.project(0,4);
List<Tuple2<Integer, Long>> result = reduceDs.collect();
String expected = "1,1\n" +
"2,1\n" +
"2,2\n" +
"3,2\n" +
"3,3\n" +
"4,1\n" +
"4,2\n" +
"5,1\n" +
"5,2\n" +
"5,3\n";
compareResultAsTuples(result, expected);
}
public static class KeySelector2 implements KeySelector<Tuple5<Integer, Long, Integer, String, Long>, Tuple2<Integer, Long>> {
private static final long serialVersionUID = 1L;
@Override
public Tuple2<Integer,Long> getKey(Tuple5<Integer, Long, Integer, String, Long> t) {
return new Tuple2<Integer, Long>(t.f0, t.f4);
}
}
@Test
public void testCorrectnessOfDistinctOnTuplesWithFieldExpressions() throws Exception {
/*
* check correctness of distinct on tuples with field expressions
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple5<Integer, Long, Integer, String, Long>> ds = CollectionDataSets.getSmall5TupleDataSet(env);
DataSet<Tuple1<Integer>> reduceDs = ds.union(ds).distinct("f0").project(0);
List<Tuple1<Integer>> result = reduceDs.collect();
String expected = "1\n" +
"2\n";
compareResultAsTuples(result, expected);
}
@Test
public void testCorrectnessOfDistinctOnPojos() throws Exception {
/*
* check correctness of distinct on Pojos
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<POJO> ds = CollectionDataSets.getDuplicatePojoDataSet(env);
DataSet<Integer> reduceDs = ds.distinct("nestedPojo.longNumber").map(new Mapper2());
List<Integer> result = reduceDs.collect();
String expected = "10000\n20000\n30000\n";
compareResultAsText(result, expected);
}
public static class Mapper2 implements MapFunction<CollectionDataSets.POJO, Integer> {
@Override
public Integer map(POJO value) throws Exception {
return (int) value.nestedPojo.longNumber;
}
}
@Test
public void testDistinctOnFullPojo() throws Exception {
/*
* distinct on full Pojo
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<POJO> ds = CollectionDataSets.getDuplicatePojoDataSet(env);
DataSet<Integer> reduceDs = ds.distinct().map(new Mapper1());
List<Integer> result = reduceDs.collect();
String expected = "10000\n20000\n30000\n";
compareResultAsText(result, expected);
}
public static class Mapper1 implements MapFunction<CollectionDataSets.POJO, Integer> {
@Override
public Integer map(POJO value) throws Exception {
return (int) value.nestedPojo.longNumber;
}
}
@Test
public void testCorrectnessOfDistinctOnAtomic() throws Exception {
/*
* check correctness of distinct on Integers
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Integer> ds = CollectionDataSets.getIntegerDataSet(env);
DataSet<Integer> reduceDs = ds.distinct();
List<Integer> result = reduceDs.collect();
String expected = "1\n2\n3\n4\n5";
compareResultAsText(result, expected);
}
@Test
public void testCorrectnessOfDistinctOnAtomicWithSelectAllChar() throws Exception {
/*
* check correctness of distinct on Strings, using Keys.ExpressionKeys.SELECT_ALL_CHAR
*/
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<String> ds = CollectionDataSets.getStringDataSet(env);
DataSet<String> reduceDs = ds.union(ds).distinct("*");
List<String> result = reduceDs.collect();
String expected = "I am fine.\n" +
"Luke Skywalker\n" +
"LOL\n" +
"Hello world, how are you?\n" +
"Hi\n" +
"Hello world\n" +
"Hello\n" +
"Random comment\n";
compareResultAsText(result, expected);
}
}