Contains a map of tables and their respective keys that were not processed with the current response, possibly due to reaching a limit on
the response size. The UnprocessedKeys value is in the same form as a RequestItems parameter (so the value can be provided
directly to a subsequent BatchGetItem operation). For more information, see the above RequestItems parameter.
Constraints:

C# |
public Dictionary<string, KeysAndAttributes> UnprocessedKeys { get; set; }