code: protected String createId(String group, String id) {
          if (group == null || id == null || group.contains(idSeparator) || id.contains(idSeparator)) {
              throw new IllegalArgumentException(String.format("Illegal arguments specified for column name creation (group = %s, id = %s)", group, id));
          }
          return String.format("%s%s%s", group, idSeparator, id);
      }
docs: @warn method description missing
  @warn parameter descriptions missing
  @warn exception IllegalArgumentException description missing
  
  @param group
  @param id
  @return
  @throws IllegalArgumentException