> A library to parse and optimize SQL,

That's like saying "a library to parse and optimize computer programs", except probably even harder, since a compiler and runtime library can't make any assumptions about the programs they need to make run, so they're limited in the potential of utilizing all that context information.

Countless person-years have been spent on this and it's still a very active fields of research and engineering.

> 2x SparkSQL performance

Ah, ok, so it can be slow. Never mind then, carry on :-P