/*
* 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 java.util.ArrayList;
import java.util.List;
import org.apache.flink.api.common.InvalidProgramException;
import org.apache.flink.api.common.operators.Order;
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.tuple.Tuple5;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;
import org.junit.Assert;
import org.junit.Test;
public class FirstNOperatorTest {
// TUPLE DATA
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 testUngroupedFirstN() {
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);
// should work
try {
tupleDs.first(1);
} catch(Exception e) {
Assert.fail();
}
// should work
try {
tupleDs.first(10);
} catch(Exception e) {
Assert.fail();
}
// should not work n == 0
try {
tupleDs.first(0);
Assert.fail();
} catch(InvalidProgramException ipe) {
// we're good here
} catch(Exception e) {
Assert.fail();
}
// should not work n == -1
try {
tupleDs.first(-1);
Assert.fail();
} catch(InvalidProgramException ipe) {
// we're good here
} catch(Exception e) {
Assert.fail();
}
}
@Test
public void testGroupedFirstN() {
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);
// should work
try {
tupleDs.groupBy(2).first(1);
} catch(Exception e) {
Assert.fail();
}
// should work
try {
tupleDs.groupBy(1,3).first(10);
} catch(Exception e) {
Assert.fail();
}
// should not work n == 0
try {
tupleDs.groupBy(0).first(0);
Assert.fail();
} catch(InvalidProgramException ipe) {
// we're good here
} catch(Exception e) {
Assert.fail();
}
// should not work n == -1
try {
tupleDs.groupBy(2).first(-1);
Assert.fail();
} catch(InvalidProgramException ipe) {
// we're good here
} catch(Exception e) {
Assert.fail();
}
}
@Test
public void testGroupedSortedFirstN() {
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);
// should work
try {
tupleDs.groupBy(2).sortGroup(4, Order.ASCENDING).first(1);
} catch(Exception e) {
Assert.fail();
}
// should work
try {
tupleDs.groupBy(1,3).sortGroup(4, Order.ASCENDING).first(10);
} catch(Exception e) {
Assert.fail();
}
// should not work n == 0
try {
tupleDs.groupBy(0).sortGroup(4, Order.ASCENDING).first(0);
Assert.fail();
} catch(InvalidProgramException ipe) {
// we're good here
} catch(Exception e) {
Assert.fail();
}
// should not work n == -1
try {
tupleDs.groupBy(2).sortGroup(4, Order.ASCENDING).first(-1);
Assert.fail();
} catch(InvalidProgramException ipe) {
// we're good here
} catch(Exception e) {
Assert.fail();
}
}
}