title: AWSDynamoDBQueryExpression order by UNIX timestamp
body: <p>I am new to NoSQL databases and I have changed my database schema from storing dates as a UTC timestamp string, to a UNIX timestamp (number), in hopes that I can create either a scan or a query expression to find the 1000 most recent items in the table. I have yet to find a simple snippet of code to accomplish this using the AWSDynamoDBQueryExpression class. Scan doesn't appear to have any sort mechanism but query might. Any ideas?</p>