表一:
"_id":"2a0398605f1114*****d69a167ebf9ed"
"alist":[{id:1},{id:2},{id:3}]
表二:
"_id":"1"
"name":"A"
"aAid":100
------------
"_id":"2"
"name":"B"
"aAid":101
--------------
"_id":"3"
"name":"C"
"aAid":200

这样的两张表，如何能聚合查询。吧aAid和alist数组中对象的id对应