Under big data, does CBO have such a big effect? Node like filter/join/aggregate, their cost is estimated.
There's one case, I call it runtime optimizing, it means optimizing while c alculating, You adjust your execution plan in real-time based on the execution statistics of the previous step(like join stragety selection, hash or broadcast or SMJ), but it's not CBO, like in volcano planner. Regards! Aron Tao
