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/*
* 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 test.org.apache.spark.sql.sources;
import java.util.Arrays;
import scala.Tuple2;
import org.junit.Assert;
import org.junit.Test;
import org.apache.spark.api.java.function.MapFunction;
import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Encoder;
import org.apache.spark.sql.Encoders;
import org.apache.spark.sql.KeyValueGroupedDataset;
import org.apache.spark.sql.expressions.Aggregator;
import org.apache.spark.sql.expressions.java.typed;
/**
* Suite for testing the aggregate functionality of Datasets in Java.
*/
public class JavaDatasetAggregatorSuite extends JavaDatasetAggregatorSuiteBase {
@Test
public void testTypedAggregationAnonClass() {
KeyValueGroupedDataset<String, Tuple2<String, Integer>> grouped = generateGroupedDataset();
Dataset<Tuple2<String, Integer>> agged = grouped.agg(new IntSumOf().toColumn());
Assert.assertEquals(Arrays.asList(tuple2("a", 3), tuple2("b", 3)), agged.collectAsList());
Dataset<Tuple2<String, Integer>> agged2 = grouped.agg(new IntSumOf().toColumn())
.as(Encoders.tuple(Encoders.STRING(), Encoders.INT()));
Assert.assertEquals(
Arrays.asList(
new Tuple2<>("a", 3),
new Tuple2<>("b", 3)),
agged2.collectAsList());
}
static class IntSumOf extends Aggregator<Tuple2<String, Integer>, Integer, Integer> {
@Override
public Integer zero() {
return 0;
}
@Override
public Integer reduce(Integer l, Tuple2<String, Integer> t) {
return l + t._2();
}
@Override
public Integer merge(Integer b1, Integer b2) {
return b1 + b2;
}
@Override
public Integer finish(Integer reduction) {
return reduction;
}
@Override
public Encoder<Integer> bufferEncoder() {
return Encoders.INT();
}
@Override
public Encoder<Integer> outputEncoder() {
return Encoders.INT();
}
}
@Test
public void testTypedAggregationAverage() {
KeyValueGroupedDataset<String, Tuple2<String, Integer>> grouped = generateGroupedDataset();
Dataset<Tuple2<String, Double>> agged = grouped.agg(typed.avg(
new MapFunction<Tuple2<String, Integer>, Double>() {
public Double call(Tuple2<String, Integer> value) throws Exception {
return (double)(value._2() * 2);
}
}));
Assert.assertEquals(Arrays.asList(tuple2("a", 3.0), tuple2("b", 6.0)), agged.collectAsList());
}
@Test
public void testTypedAggregationCount() {
KeyValueGroupedDataset<String, Tuple2<String, Integer>> grouped = generateGroupedDataset();
Dataset<Tuple2<String, Long>> agged = grouped.agg(typed.count(
new MapFunction<Tuple2<String, Integer>, Object>() {
public Object call(Tuple2<String, Integer> value) throws Exception {
return value;
}
}));
Assert.assertEquals(Arrays.asList(tuple2("a", 2), tuple2("b", 1)), agged.collectAsList());
}
@Test
public void testTypedAggregationSumDouble() {
KeyValueGroupedDataset<String, Tuple2<String, Integer>> grouped = generateGroupedDataset();
Dataset<Tuple2<String, Double>> agged = grouped.agg(typed.sum(
new MapFunction<Tuple2<String, Integer>, Double>() {
public Double call(Tuple2<String, Integer> value) throws Exception {
return (double)value._2();
}
}));
Assert.assertEquals(Arrays.asList(tuple2("a", 3.0), tuple2("b", 3.0)), agged.collectAsList());
}
@Test
public void testTypedAggregationSumLong() {
KeyValueGroupedDataset<String, Tuple2<String, Integer>> grouped = generateGroupedDataset();
Dataset<Tuple2<String, Long>> agged = grouped.agg(typed.sumLong(
new MapFunction<Tuple2<String, Integer>, Long>() {
public Long call(Tuple2<String, Integer> value) throws Exception {
return (long)value._2();
}
}));
Assert.assertEquals(Arrays.asList(tuple2("a", 3), tuple2("b", 3)), agged.collectAsList());
}
}
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