title: is there any impact in performance when we need to access last sort key for any particular partition key
body: <p>I am creating a dynamoDB table. I am using an custromerId as partition key and versionNumber as sort key. suppose there are 1000 versions for any particular customerId. for my use-case I always want to find out last version of any customerId. will there be any difference in performance when i want first versionNumber and when i want last versionNumber or both will take same time.</p>