To be clear, this demonstrates Lua scripts running in Nginx and making calls to MySQL (or Drizzle).
This is not running Lua scripts like stored procedures in a MySQL process.
Looks amazing, although quite complex. Hopefully I'll get the chance to install everything and test it out. Looks like it could have some great performance gains for an api.
Agentzh is doing some super impressive work with nginx+lua. Openresty is a very interesting project with tons of features over standard nginx and is highly recommended