I'd put it this way: It could be made to work, but IMO all current RDBMS have the same problems with terrible worst case guarantees. Query planners have not eno

I'd put it this way: It could be made to work, but IMO all current RDBMS have the same problems with terrible worst case guarantees. Query planners have not enough degrees of freedom - maybe with a new concept like automated indices it could be made to work with acceptable average and worst case guarantees.