@Test
public void testTupleEncoder() {
Encoder<Tuple2<Integer, String>> encoder2 = Encoders.tuple(Encoders.INT(), Encoders.STRING());
List<Tuple2<Integer, String>> data2 = Arrays.asList(tuple2(1, "a"), tuple2(2, "b"));
Dataset<Tuple2<Integer, String>> ds2 = context.createDataset(data2, encoder2);
Assert.assertEquals(data2, ds2.collectAsList());
Encoder<Tuple3<Integer, Long, String>> encoder3 =
Encoders.tuple(Encoders.INT(), Encoders.LONG(), Encoders.STRING());
List<Tuple3<Integer, Long, String>> data3 =
Arrays.asList(new Tuple3<Integer, Long, String>(1, 2L, "a"));
Dataset<Tuple3<Integer, Long, String>> ds3 = context.createDataset(data3, encoder3);
Assert.assertEquals(data3, ds3.collectAsList());
Encoder<Tuple4<Integer, String, Long, String>> encoder4 =
Encoders.tuple(Encoders.INT(), Encoders.STRING(), Encoders.LONG(), Encoders.STRING());
List<Tuple4<Integer, String, Long, String>> data4 =
Arrays.asList(new Tuple4<Integer, String, Long, String>(1, "b", 2L, "a"));
Dataset<Tuple4<Integer, String, Long, String>> ds4 = context.createDataset(data4, encoder4);
Assert.assertEquals(data4, ds4.collectAsList());
Encoder<Tuple5<Integer, String, Long, String, Boolean>> encoder5 =
Encoders.tuple(
Encoders.INT(),
Encoders.STRING(),
Encoders.LONG(),
Encoders.STRING(),
Encoders.BOOLEAN());
List<Tuple5<Integer, String, Long, String, Boolean>> data5 =
Arrays.asList(new Tuple5<Integer, String, Long, String, Boolean>(1, "b", 2L, "a", true));
Dataset<Tuple5<Integer, String, Long, String, Boolean>> ds5 =
context.createDataset(data5, encoder5);
Assert.assertEquals(data5, ds5.collectAsList());
}
@Test
public void testNestedTupleEncoder() {
// test ((int, string), string)
Encoder<Tuple2<Tuple2<Integer, String>, String>> encoder =
Encoders.tuple(Encoders.tuple(Encoders.INT(), Encoders.STRING()), Encoders.STRING());
List<Tuple2<Tuple2<Integer, String>, String>> data =
Arrays.asList(tuple2(tuple2(1, "a"), "a"), tuple2(tuple2(2, "b"), "b"));
Dataset<Tuple2<Tuple2<Integer, String>, String>> ds = context.createDataset(data, encoder);
Assert.assertEquals(data, ds.collectAsList());
// test (int, (string, string, long))
Encoder<Tuple2<Integer, Tuple3<String, String, Long>>> encoder2 =
Encoders.tuple(
Encoders.INT(), Encoders.tuple(Encoders.STRING(), Encoders.STRING(), Encoders.LONG()));
List<Tuple2<Integer, Tuple3<String, String, Long>>> data2 =
Arrays.asList(tuple2(1, new Tuple3<String, String, Long>("a", "b", 3L)));
Dataset<Tuple2<Integer, Tuple3<String, String, Long>>> ds2 =
context.createDataset(data2, encoder2);
Assert.assertEquals(data2, ds2.collectAsList());
// test (int, ((string, long), string))
Encoder<Tuple2<Integer, Tuple2<Tuple2<String, Long>, String>>> encoder3 =
Encoders.tuple(
Encoders.INT(),
Encoders.tuple(Encoders.tuple(Encoders.STRING(), Encoders.LONG()), Encoders.STRING()));
List<Tuple2<Integer, Tuple2<Tuple2<String, Long>, String>>> data3 =
Arrays.asList(tuple2(1, tuple2(tuple2("a", 2L), "b")));
Dataset<Tuple2<Integer, Tuple2<Tuple2<String, Long>, String>>> ds3 =
context.createDataset(data3, encoder3);
Assert.assertEquals(data3, ds3.collectAsList());
}
@Test
public void testJoin() {
List<Integer> data = Arrays.asList(1, 2, 3);
Dataset<Integer> ds = context.createDataset(data, Encoders.INT()).as("a");
List<Integer> data2 = Arrays.asList(2, 3, 4);
Dataset<Integer> ds2 = context.createDataset(data2, Encoders.INT()).as("b");
Dataset<Tuple2<Integer, Integer>> joined =
ds.joinWith(ds2, col("a.value").equalTo(col("b.value")));
Assert.assertEquals(Arrays.asList(tuple2(2, 2), tuple2(3, 3)), joined.collectAsList());
}
@Test
public void testSelect() {
List<Integer> data = Arrays.asList(2, 6);
Dataset<Integer> ds = context.createDataset(data, Encoders.INT());
Dataset<Tuple2<Integer, String>> selected =
ds.select(expr("value + 1"), col("value").cast("string"))
.as(Encoders.tuple(Encoders.INT(), Encoders.STRING()));
Assert.assertEquals(Arrays.asList(tuple2(3, "2"), tuple2(7, "6")), selected.collectAsList());
}
@Test
public void testCommonOperation() {
List<String> data = Arrays.asList("hello", "world");
Dataset<String> ds = context.createDataset(data, Encoders.STRING());
Assert.assertEquals("hello", ds.first());
Dataset<String> filtered =
ds.filter(
new FilterFunction<String>() {
@Override
public boolean call(String v) throws Exception {
return v.startsWith("h");
}
});
Assert.assertEquals(Arrays.asList("hello"), filtered.collectAsList());
Dataset<Integer> mapped =
ds.map(
new MapFunction<String, Integer>() {
@Override
public Integer call(String v) throws Exception {
return v.length();
}
},
Encoders.INT());
Assert.assertEquals(Arrays.asList(5, 5), mapped.collectAsList());
Dataset<String> parMapped =
ds.mapPartitions(
new MapPartitionsFunction<String, String>() {
@Override
public Iterable<String> call(Iterator<String> it) throws Exception {
List<String> ls = new LinkedList<String>();
while (it.hasNext()) {
ls.add(it.next().toUpperCase());
}
return ls;
}
},
Encoders.STRING());
Assert.assertEquals(Arrays.asList("HELLO", "WORLD"), parMapped.collectAsList());
Dataset<String> flatMapped =
ds.flatMap(
new FlatMapFunction<String, String>() {
@Override
public Iterable<String> call(String s) throws Exception {
List<String> ls = new LinkedList<String>();
for (char c : s.toCharArray()) {
ls.add(String.valueOf(c));
}
return ls;
}
},
Encoders.STRING());
Assert.assertEquals(
Arrays.asList("h", "e", "l", "l", "o", "w", "o", "r", "l", "d"),
flatMapped.collectAsList());
}
@Test
public void testTypedAggregation() {
Encoder<Tuple2<String, Integer>> encoder = Encoders.tuple(Encoders.STRING(), Encoders.INT());
List<Tuple2<String, Integer>> data =
Arrays.asList(tuple2("a", 1), tuple2("a", 2), tuple2("b", 3));
Dataset<Tuple2<String, Integer>> ds = context.createDataset(data, encoder);
GroupedDataset<String, Tuple2<String, Integer>> grouped =
ds.groupBy(
new MapFunction<Tuple2<String, Integer>, String>() {
@Override
public String call(Tuple2<String, Integer> value) throws Exception {
return value._1();
}
},
Encoders.STRING());
Dataset<Tuple2<String, Integer>> agged =
grouped.agg(new IntSumOf().toColumn(Encoders.INT(), Encoders.INT()));
Assert.assertEquals(Arrays.asList(tuple2("a", 3), tuple2("b", 3)), agged.collectAsList());
Dataset<Tuple2<String, Integer>> agged2 =
grouped
.agg(new IntSumOf().toColumn(Encoders.INT(), Encoders.INT()))
.as(Encoders.tuple(Encoders.STRING(), Encoders.INT()));
Assert.assertEquals(
Arrays.asList(new Tuple2<>("a", 3), new Tuple2<>("b", 3)), agged2.collectAsList());
}
@Test
public void testReduce() {
List<Integer> data = Arrays.asList(1, 2, 3);
Dataset<Integer> ds = context.createDataset(data, Encoders.INT());
int reduced =
ds.reduce(
new ReduceFunction<Integer>() {
@Override
public Integer call(Integer v1, Integer v2) throws Exception {
return v1 + v2;
}
});
Assert.assertEquals(6, reduced);
}
@Test
public void testGroupByColumn() {
List<String> data = Arrays.asList("a", "foo", "bar");
Dataset<String> ds = context.createDataset(data, Encoders.STRING());
GroupedDataset<Integer, String> grouped =
ds.groupBy(length(col("value"))).keyAs(Encoders.INT());
Dataset<String> mapped =
grouped.mapGroups(
new MapGroupsFunction<Integer, String, String>() {
@Override
public String call(Integer key, Iterator<String> data) throws Exception {
StringBuilder sb = new StringBuilder(key.toString());
while (data.hasNext()) {
sb.append(data.next());
}
return sb.toString();
}
},
Encoders.STRING());
Assert.assertEquals(Arrays.asList("1a", "3foobar"), mapped.collectAsList());
}
@Test
public void testGroupBy() {
List<String> data = Arrays.asList("a", "foo", "bar");
Dataset<String> ds = context.createDataset(data, Encoders.STRING());
GroupedDataset<Integer, String> grouped =
ds.groupBy(
new MapFunction<String, Integer>() {
@Override
public Integer call(String v) throws Exception {
return v.length();
}
},
Encoders.INT());
Dataset<String> mapped =
grouped.mapGroups(
new MapGroupsFunction<Integer, String, String>() {
@Override
public String call(Integer key, Iterator<String> values) throws Exception {
StringBuilder sb = new StringBuilder(key.toString());
while (values.hasNext()) {
sb.append(values.next());
}
return sb.toString();
}
},
Encoders.STRING());
Assert.assertEquals(Arrays.asList("1a", "3foobar"), mapped.collectAsList());
Dataset<String> flatMapped =
grouped.flatMapGroups(
new FlatMapGroupsFunction<Integer, String, String>() {
@Override
public Iterable<String> call(Integer key, Iterator<String> values) throws Exception {
StringBuilder sb = new StringBuilder(key.toString());
while (values.hasNext()) {
sb.append(values.next());
}
return Collections.singletonList(sb.toString());
}
},
Encoders.STRING());
Assert.assertEquals(Arrays.asList("1a", "3foobar"), flatMapped.collectAsList());
Dataset<Tuple2<Integer, String>> reduced =
grouped.reduce(
new ReduceFunction<String>() {
@Override
public String call(String v1, String v2) throws Exception {
return v1 + v2;
}
});
Assert.assertEquals(
Arrays.asList(tuple2(1, "a"), tuple2(3, "foobar")), reduced.collectAsList());
List<Integer> data2 = Arrays.asList(2, 6, 10);
Dataset<Integer> ds2 = context.createDataset(data2, Encoders.INT());
GroupedDataset<Integer, Integer> grouped2 =
ds2.groupBy(
new MapFunction<Integer, Integer>() {
@Override
public Integer call(Integer v) throws Exception {
return v / 2;
}
},
Encoders.INT());
Dataset<String> cogrouped =
grouped.cogroup(
grouped2,
new CoGroupFunction<Integer, String, Integer, String>() {
@Override
public Iterable<String> call(
Integer key, Iterator<String> left, Iterator<Integer> right) throws Exception {
StringBuilder sb = new StringBuilder(key.toString());
while (left.hasNext()) {
sb.append(left.next());
}
sb.append("#");
while (right.hasNext()) {
sb.append(right.next());
}
return Collections.singletonList(sb.toString());
}
},
Encoders.STRING());
Assert.assertEquals(Arrays.asList("1a#2", "3foobar#6", "5#10"), cogrouped.collectAsList());
}