{ //此处为age=26 "$eq" : 26 } }, "winningPlan" : { //最佳的执行计划 "stage" : "COLLSCAN", //COLLSCAN为集合扫描 "filter" : { //过滤条件 "age" : { "$eq" : 26 } }, "direction" : "forward" //方向:forward }, "rejectedPlans" : [