sum() and distinct() come to mind for sure, but I don't know how easy they'd be to implement. The particular use case I have in mind is where we have events str

sum() and distinct() come to mind for sure, but I don't know how easy they'd be to implement. The particular use case I have in mind is where we have events streaming in and we usually don't care about the actual events, just various sums, counts and distinct counts over them grouped by various dimensions.