I think the problem is that every relational query can be implemented a KV store, but usually the trade offs and bugs in your nascent query engine IS boring, an

I think the problem is that every relational query can be implemented a KV store, but usually the trade offs and bugs in your nascent query engine IS boring, and we can already use a bunch of hella fast KV stores out there if you dont care about ACID or you are willing to give up your decades long implementation details on SQL engine of choice.