@Udf
  public String chr(@UdfParameter(
      description = "Decimal codepoint") final Integer decimalCode) {
    if (decimalCode == null) {
      return null;
    }
    if (!Character.isValidCodePoint(decimalCode)) {
      return null;
    }
    final char[] resultChars = Character.toChars(decimalCode);
    return String.valueOf(resultChars);
  }
@Test
  public void shouldConvertFromUTF16StringWithSlash() {
    final String result = udf.chr("\\u004b");
    assertThat(result, is("K"));
  }