question: find the cardinality of the best join order in the cache for the specified plan concode_field_sep HashMap<Set<LogicalJoinNode>,Double> bestCosts concode_elem_sep HashMap<Set<LogicalJoinNode>,Integer> bestCardinalities concode_elem_sep HashMap<Set<LogicalJoinNode>,Vector<LogicalJoinNode>> bestOrders concode_field_sep void addPlan concode_elem_sep Vector<LogicalJoinNode> getOrder concode_elem_sep double getCost
target: int function ( Set < LogicalJoinNode > arg0 ) { return bestCardinalities . get ( arg0 ) ; }