| /* |
| * 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.common.functions.MapFunction; |
| import org.apache.flink.api.common.operators.Order; |
| 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.java.operators.GroupReduceOperator; |
| 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.test.operators.util.CollectionDataSets; |
| import org.apache.flink.test.util.MultipleProgramsTestBase; |
| |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.Parameterized; |
| |
| import java.util.List; |
| |
| /** Integration tests for {@link DataSet#first}. */ |
| @RunWith(Parameterized.class) |
| public class FirstNITCase extends MultipleProgramsTestBase { |
| public FirstNITCase(TestExecutionMode mode) { |
| super(mode); |
| } |
| |
| @Test |
| public void testFirstNOnUngroupedDS() throws Exception { |
| /* |
| * First-n on ungrouped data set |
| */ |
| |
| final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); |
| |
| DataSet<Tuple3<Integer, Long, String>> ds = CollectionDataSets.get3TupleDataSet(env); |
| DataSet<Tuple1<Integer>> seven = ds.first(7).map(new OneMapper()).sum(0); |
| |
| List<Tuple1<Integer>> result = seven.collect(); |
| |
| String expected = "(7)\n"; |
| |
| compareResultAsText(result, expected); |
| } |
| |
| @Test |
| public void testFirstNOnGroupedDS() throws Exception { |
| /* |
| * First-n on grouped data set |
| */ |
| |
| final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); |
| |
| DataSet<Tuple3<Integer, Long, String>> ds = CollectionDataSets.get3TupleDataSet(env); |
| DataSet<Tuple2<Long, Integer>> first = |
| ds.groupBy(1).first(4).map(new OneMapper2()).groupBy(0).sum(1); |
| |
| List<Tuple2<Long, Integer>> result = first.collect(); |
| |
| String expected = "(1,1)\n(2,2)\n(3,3)\n(4,4)\n(5,4)\n(6,4)\n"; |
| |
| compareResultAsText(result, expected); |
| } |
| |
| @Test |
| public void testFirstNOnGroupedAndSortedDS() throws Exception { |
| /* |
| * First-n on grouped and sorted data set |
| */ |
| |
| final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); |
| |
| DataSet<Tuple3<Integer, Long, String>> ds = CollectionDataSets.get3TupleDataSet(env); |
| DataSet<Tuple2<Long, Integer>> first = |
| ds.groupBy(1).sortGroup(0, Order.DESCENDING).first(3).project(1, 0); |
| |
| List<Tuple2<Long, Integer>> result = first.collect(); |
| |
| String expected = |
| "(1,1)\n" |
| + "(2,3)\n(2,2)\n" |
| + "(3,6)\n(3,5)\n(3,4)\n" |
| + "(4,10)\n(4,9)\n(4,8)\n" |
| + "(5,15)\n(5,14)\n(5,13)\n" |
| + "(6,21)\n(6,20)\n(6,19)\n"; |
| |
| compareResultAsText(result, expected); |
| } |
| |
| /** Test for FLINK-2135. */ |
| @Test |
| public void testFaultyCast() throws Exception { |
| ExecutionEnvironment ee = ExecutionEnvironment.getExecutionEnvironment(); |
| |
| DataSet<String> b = ee.fromElements("a", "b"); |
| GroupReduceOperator<String, String> a = |
| b.groupBy( |
| new KeySelector<String, Long>() { |
| @Override |
| public Long getKey(String value) throws Exception { |
| return 1L; |
| } |
| }) |
| .sortGroup( |
| new KeySelector<String, Double>() { |
| @Override |
| public Double getKey(String value) throws Exception { |
| return 1.0; |
| } |
| }, |
| Order.DESCENDING) |
| .first(1); |
| |
| List<String> result = b.collect(); |
| |
| String expected = "a\nb"; |
| |
| compareResultAsText(result, expected); |
| } |
| |
| private static class OneMapper |
| implements MapFunction<Tuple3<Integer, Long, String>, Tuple1<Integer>> { |
| private static final long serialVersionUID = 1L; |
| private final Tuple1<Integer> one = new Tuple1<Integer>(1); |
| |
| @Override |
| public Tuple1<Integer> map(Tuple3<Integer, Long, String> value) { |
| return one; |
| } |
| } |
| |
| private static class OneMapper2 |
| implements MapFunction<Tuple3<Integer, Long, String>, Tuple2<Long, Integer>> { |
| private static final long serialVersionUID = 1L; |
| private final Tuple2<Long, Integer> one = new Tuple2<>(0L, 1); |
| |
| @Override |
| public Tuple2<Long, Integer> map(Tuple3<Integer, Long, String> value) { |
| one.f0 = value.f1; |
| return one; |
| } |
| } |
| } |