public static DistributionData create(long sum, long count, long min, long max) {
    return new AutoValue_DistributionData(sum, count, min, max);
  }
@Test
  public void testCreate() {
    DistributionData data = DistributionData.create(5, 2, 1, 4);
    assertEquals(5, data.sum());
    assertEquals(2, data.count());
    assertEquals(1, data.min());
    assertEquals(4, data.max());
  }