At first glance it looks like doing a query involves streaming the entire dataset into memory while selecting and projecting on the fly. If that's true, what ha

At first glance it looks like doing a query involves streaming the entire dataset into memory while selecting and projecting on the fly. If that's true, what happens when you have truly massive rows (i.e., things containing MEDIUMTEXTs or worse)? Okay, reading further down you only get very basic data types. Still, nothing in the spec appears to prohibit very long rows, and I'd imagine performance starts to fall off once you're throwing around tens of kilobytes per row. Any plans to support pushing the projection operation into the read phase so you can work with massive individual records? And where's the source? I want to see exactly how much this differs from a modern SQL engine.