code: public void fillMutation(T instance, ColumnListMutation<String> mutation) {
          for (String fieldName : getNames()) {
              Coercions.setColumnMutationFromField(instance, fields.get(fieldName), fieldName, mutation);
          }
      }
docs: Map a bean to a column mutation. i.e. set the columns in the mutation to
  the corresponding values from the instance
  
  @param instance
  instance
  @param mutation
  mutation