Right, that's a sort of counterpoint. It is nice to know that you're going to be getting a fork so you have context for the kitchen -> sink -> drawer instructions. Similarly, I expect in many cases, when you have a complex query, the fact that you know the result is going to be "userid, sum(score)", it makes the subsequent query easier to understand (as you know where it's got to end up). "Can you get me a fork? In the kitchen, next to the sink, in the drawer" might be even friendlier.