public static String validateColumnName(@Nullable String columnName) {
    String name = requireNonNull(columnName, "Column name cannot be null");
    checkDbIdentifierCharacters(columnName, "Column name");
    return name;
  }
@Test
  public void accept_valid_table_name() {
    validateColumnName("date_in_ms");
    validateColumnName("date_in_ms_1");
  }