title: Projection Expression with DynamoDBMapper
body: <p>I have 500 items to be retrieved using 500 primary key attribute and I want to retrieve 4 attributes of each item instead of all the attributes. I am using DynamoDBMapper in Java, but I am unable to find a way to project them to a specific number of attributes. Retrieving all the attributes might be very costly since one of attributes can be very big. Is there a way to get 4 attributes of all those 500 items using DynamoDBMapper?</p>