Make the single element fetch do a random fetch, not sequential

[Frans Bouma]

It currently reads elements sequentially for the single element fetches, not using random keys. It might make some (not much) difference, though it likely won't be a significant delimiter as each framework has to deal with the slower fetch on the DB, materialization speed will be equal.

[Frans Bouma]

won't implement, it's not the goal of the bencher to test this.