docs: private <T> List<FieldMetaData> praseFieldList(Class<T> genericType) {
          Field[] fields = genericType.getDeclaredFields();
          List<FieldMetaData> mapedFieldList = new ArrayList<FieldMetaData>();
          for (int i = 0; i < fields.length; i++) {
              if (fields[i].isAnnotationPresent(FdfsColumn.class)) {
                  FieldMetaData fieldMetaData = new FieldMetaData(fields[i], fieldsTotalSize);
                  mapedFieldList.add(fieldMetaData);
                  // 计算偏移量
                  fieldsTotalSize += fieldMetaData.getRealeSize();
                  // 如果是动态计算列
                  if (fieldMetaData.isDynamicField()) {
                      dynamicFieldList.add(fieldMetaData);
                  }
              }
          }
          return mapedFieldList;
      }