@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 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 testTake() {
   List<String> data = Arrays.asList("hello", "world");
   Dataset<String> ds = context.createDataset(data, Encoders.STRING());
   List<String> collected = ds.takeAsList(1);
   Assert.assertEquals(Arrays.asList("hello"), collected);
 }
  @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 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 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 testSetOperation() {
    List<String> data = Arrays.asList("abc", "abc", "xyz");
    Dataset<String> ds = context.createDataset(data, Encoders.STRING());

    Assert.assertEquals(
        Arrays.asList("abc", "xyz"), sort(ds.distinct().collectAsList().toArray(new String[0])));

    List<String> data2 = Arrays.asList("xyz", "foo", "foo");
    Dataset<String> ds2 = context.createDataset(data2, Encoders.STRING());

    Dataset<String> intersected = ds.intersect(ds2);
    Assert.assertEquals(Arrays.asList("xyz"), intersected.collectAsList());

    Dataset<String> unioned = ds.union(ds2);
    Assert.assertEquals(
        Arrays.asList("abc", "abc", "foo", "foo", "xyz", "xyz"),
        sort(unioned.collectAsList().toArray(new String[0])));

    Dataset<String> subtracted = ds.subtract(ds2);
    Assert.assertEquals(Arrays.asList("abc", "abc"), subtracted.collectAsList());
  }
  @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 testForeach() {
    final Accumulator<Integer> accum = jsc.accumulator(0);
    List<String> data = Arrays.asList("a", "b", "c");
    Dataset<String> ds = context.createDataset(data, Encoders.STRING());

    ds.foreach(
        new ForeachFunction<String>() {
          @Override
          public void call(String s) throws Exception {
            accum.add(1);
          }
        });
    Assert.assertEquals(3, accum.value().intValue());
  }
Exemple #10
0
  @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());
  }