I recently finally took the time to watch that video myself.
I am wondering if I’m confusing stuff when I’m thinking that Saśa Jurić touches on the topic in the video already - starting at around 49:57min he talks about the problem of a subquery being its own select_statement() parser function.
He ends up evaluating the term lazily, just like you ended up doing, so I think it is the same situation you were dealing with?
