@Udf(description = "Returns the inverse (arc) tangent of an INT value")
  public Double atan(
          @UdfParameter(
                  value = "value",
                  description = "The value to get the inverse tangent of."
          ) final Integer value
  ) {
    return atan(value == null ? null : value.doubleValue());
  }
@Test
  public void shouldHandlePositive() {
    assertThat(udf.atan(0.43), closeTo(0.40609805831761564, 0.000000000000001));
    assertThat(udf.atan(0.5), closeTo(0.4636476090008061, 0.000000000000001));
    assertThat(udf.atan(1.0), closeTo(0.7853981633974483, 0.000000000000001));
    assertThat(udf.atan(1), closeTo(0.7853981633974483, 0.000000000000001));
    assertThat(udf.atan(1L), closeTo(0.7853981633974483, 0.000000000000001));
  }