What does SPJ stand for in MySQL parlance?

Question

MySQL has a lot of references to SPJ in MySQL including in official Oracle slides but I can't find what it actually stands for. I see it show up in a few blogs too.

I looked in the source and found nothing.

What does SPJ stand for?

Answer 1

Apparently it stands for "Select Project Join":

What’s in a name?

If some of this seems familiar but you don’t remember hearing the term “Adaptive Query Localization” before then you’re not going crazy – previous internal names were SPJ (Select Project Join) and Pushed-Down Joins. We just figured that Adaptive Query Localization was more descriptive.

Source: Dramatically Increased MySQL Cluster JOIN performance with Adaptive Query Localization