What is QP layer?

Question

From blogs.innodb.com: InnoDB Memcached with Binlog Capability

In our earlier Labs release, we presented a MySQL NoSQL solution through InnoDB Memcached Daemon Plugin (see earlier Calvin’s and my posts). That earlier release allows the Memcached Plugin directly interacting with InnoDB, completely bypassing MySQL optimizer and QP layers. It differs with another popular MySQL NoSQL solution, HandlerSocket, by skipping even the Handler API layer and directly access the InnoDB through InnoDB APIs. Thus, in theory, it would be simpler and more efficient.

What are QP Layers?

Searching did not yield me any good results. The closest I came to was Query Path. Is this right?

Answer 1

I assume it means Query Processing which includes parsing, optimizing, etc.