You would learn way more by asking an LLM how postgres works. Nobody is even reading this Rust code. There are 7000 commits over 2 weeks. What is being learned from that?
exactly zero knowledge gained. all former expert understanding is buried down in slop so it is inaccessible and will be completely inaccessible once slop-machine stops
You learn that you can build a version of Postgres that passes the tests and improves on these benchmarks in rust. You gain access to a codebase that does it which you can learn a lot from too. Definitely not zero like someone else said