Google definitely uses MySQL (e.g. https://www.mysql.com/customers/view/?id=555 https://www.mysql.com/customers/view/?id=555) and offers a MySQL deployment/mana

Google definitely uses MySQL (e.g. https://www.mysql.com/customers/view/?id=555 https://www.mysql.com/customers/view/?id=555) and offers a MySQL deployment/management as a Service in GCloud. No idea what, if any, their contributions back to upstream have been, but I know they've been using it for important internal stuff for years, so I would be very surprised if, at the very least, no patches have come from out from the chocolate factory doors.