docs: public Map<String, List<Item>> getTableItems() {
          Map<String, List<Map<String, AttributeValue>>> res = 
              result.getResponses();
          Map<String, List<Item>> map = new LinkedHashMap<String, List<Item>>(res.size());
          for (Map.Entry<String, List<Map<String, AttributeValue>>> e 
                  : res.entrySet()) {
              String tableName = e.getKey();
              List<Map<String, AttributeValue>> items = e.getValue();
              map.put(tableName, InternalUtils.toItemList(items));
          }
          return map;
      }