I want the answer from Riot

When I que and select primary as mid, and secondary as support, what is the likeliness of me getting support over mid? I' want to know how the system goes about searching for your selective roles. WHen will it settle for your secondary? Does it really try to find your primary over your secondary?

I can't imagine there is ever much of a time in league of legends when there aren't any people searching for mid... with that being said, we all know there is an abundance of people who avoid selecting support at all costs. this leads me to believe there would be a longer wait timer for those who don't select support, whereas those who place support in either of the two categories will definetly get support 99,.% of time