docs: public Entity addFieldNames(String... fieldNames) {
  		if (ArrayUtil.isNotEmpty(fieldNames)) {
  			if (null == this.fieldNames) {
  				return setFieldNames(fieldNames);
  			} else {
  				for (String fieldName : fieldNames) {
  					this.fieldNames.add(fieldName);
  				}
  			}
  		}
  		return this;
  	}