I'm doing this even more extreme... querying a whole complex object graph based on an entity framework core model :) https://github.com/MUnique/OpenMU/blob/master/src/Persistenc...

Oracle has cursor expressions that returns a resultset inside a cell from the parent resultset. The whole resultset could then be serialized to json, xml or whatever

I wish there was an equivalent function in PostgreSQL. I've even asked a question about that on stackoverflow:

https://stackoverflow.com/questions/8637050/cursor-inside-sq...

Nice !