docs: public static Map<String, AttributeValue> fromSimpleMap(
          Map<String, Object> map) {
          if (map == null)
              return null;
          // row with multiple attributes
          Map<String, AttributeValue> result = new LinkedHashMap<String, AttributeValue>();
          for (Map.Entry<String, Object> entry : map.entrySet())
              result.put(entry.getKey(), toAttributeValue(entry.getValue()));
          return result;
      }