[teacpde]

> Writing record layer in C++ would be overkill

Mind to elaborate on why C++ would be overkill? I understand the layered architecture decouples data model from underlying storage so it can be implemented in whatever language. To me, Flow and not having GC makes C++ a good choice.

[ryanworl]

It would be a fine choice, (and the document layer is) but the most performance sensitive parts of the entire system when you take it as a whole are already written in Flow. Writing it in C++ entirely would take a lot longer.