In memory of Bob Kooi (1951–1993)

He single-handedly constructed the cost-based optimizer for which Ingres is still well known. With only minor modifications, his design survives to this day. His Ingres co-workers remember his intense determination to deliver the best technology possible and his willingness to do whatever it took to make good on that goal Even though he took a fair amount of kidding about it, it was not unexpected for early arrivers at the office to find him sleeping on the foam pad he kept under his desk when in the midst of this project. Some of this work was reported in [ 11