The way I see it when you embark upon the journey of parenthood you sign a binding contract , if you can’t control your screaming child don’t bring it to a restaurant , café or other public place.
We don’t provide highchairs for a reason! Can you guess what it might be ?
You know what I was a child once (duh of course ) and my parents took me to restaurants and if I had behaved anywhere close to as the way this kid is behaving , 
running around the restaurant screaming walking on tables and throwing food on the floor on purpose . I can assure you there would have been consequences and we certainly wouldn’t have been staying to finish our meals . My father wasn’t being harsh or cruel he was right !
There are other than you in the café , some of them are on dates , some of them are trying to study and get some peace from their crazy roommates and some of them are waitresses trying to make a living off our tips. Reality check , people don’t want to be in a confined space with a screaming child , no customers = no tips for me = no romantic getaway to Quebec city , I am not amused .
If you insist on towing your poorly behaved child to a restaurant then make it a family restaurant , with highchairs , kids menus and waitresses paid to put up with it .
Option 2 discipline your child so it can exist in an adult setting without making fellow patrons and the staff want to rip their hair out and run out the door screaming themselves .
Or option 3 get a baby sitter , they exist for a reason!
I know I know you have a kid and you love them and don’t want to be mean , I have a dog and I love here too but what I don’t do is bring her to a restaurant . Why ? because she would run around the place , she would run around the place annoying people and it wouldn’t be appropriate . So why do you think it’s ok for your child to do the exact same thing ?
Order Up ! 