They're against coprocessors (having functions in the db) so you'll always be somewhat limited. Doing with shared-memory-etc will be hard. Also you can shard m

They're against coprocessors (having functions in the db) so you'll always be somewhat limited. Doing with shared-memory-etc will be hard. Also you can shard many tables as hash, so most hot-path transactions be inside a server, which you can't guarantee with range-sharding.