Comment by sedev

Digging down a couple layers of links from this, the underlying paper, "Partial State in Dataflow-Based Materialized Views" https://jon.thesquareplanet.com/papers/phd-thesis.pdf is pretty intriguing. It sounds like a potential free lunch in specific performance areas, which means it also sounds too good to be true, but if it turns out to be a metaphorical 90%-off lunch that's still very promising.