Examples with HllSketch com.yahoo.sketches.hll.HllSketch used on opensource projects

Example 56 with HllSketch

use of com.yahoo.sketches.hll.HllSketch in project Gaffer by gchq.

the class HllSketchAggregatorTest method testAggregate.

@Test
public void testAggregate() {
    final HllSketchAggregator sketchAggregator = new HllSketchAggregator();
    HllSketch currentSketch = new HllSketch(10);
    currentSketch.update("A");
    currentSketch.update("B");
    assertEquals(2.0D, currentSketch.getEstimate(), DELTA);
    HllSketch newSketch = new HllSketch(10);
    newSketch.update("C");
    newSketch.update("D");
    currentSketch = sketchAggregator.apply(currentSketch, newSketch);
    assertEquals(4.0D, currentSketch.getEstimate(), DELTA);
}

Example 57 with HllSketch

use of com.yahoo.sketches.hll.HllSketch in project Gaffer by gchq.

the class IterableToHllSketchTest method shouldCreateEmptyWhenNull.

@Test
public void shouldCreateEmptyWhenNull() {
    // Given
    IterableToHllSketch iterableToHllSketch = new IterableToHllSketch();
    // When
    HllSketch result = iterableToHllSketch.apply(null);
    // Then
    assertThat(result.getEstimate()).isEqualTo(0);
}

Example 58 with HllSketch

use of com.yahoo.sketches.hll.HllSketch in project Gaffer by gchq.

the class HllpSketchJsonSerialisationTest method shouldDeserialiseNewHllpWithValues.

@Test
public void shouldDeserialiseNewHllpWithValues() throws IOException {
    // Given
    final String sketchAsString = "{\"logK\": 20, \"values\": [\"value1\", \"value2\", \"value2\", \"value2\", \"value3\"]}";
    // When
    HllSketch hllp = JSONSerialiser.deserialise(sketchAsString, HllSketch.class);
    // Then
    HllSketch expected = new HllSketch(20);
    expected.update("value1");
    expected.update("value2");
    expected.update("value2");
    expected.update("value2");
    expected.update("value3");
    assertArrayEquals(expected.toCompactByteArray(), hllp.toCompactByteArray());
}