db.a.find({ "id" :

{ "$in" : ["3", "5"] }

})

for this query, I just create a filter like below bson object which is workable.

new BasicDBObject("id", new BasicDBObject("$in", new String[] {"3", "5"]));

 

db.a.find({ "id" :

{ "$in" : db.b.distinct("id") }

})

for this second query, is there a way to create a BasicDBObject for filter object.

I mean how to express nested query body, db.b.distinct("id"), in BasicDBObject.