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Mongodb聚合管道如何限制关联查询的子集合的字段?

在实现一个聚合管道查询两张表的功能时,子表中有些字段并不需要,该怎么排除掉无用的字段呢?
image
数据结构如图:
image
我试着用$project操作符可以排除掉结果主表的对应字段,但链接进的sdatas表中对应的字段却没有去除。
这种情况下,应该怎么去除掉sdatas子表中的特定字段?


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