Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{test:[{a:"1",b:"2"},{a:"3"}]}]
Query
db.collection.aggregate([{$project:{test:{$filter:{input:"$test",cond:{$ne:[{$type:"$$this.b"},"missing"]}}}}}])
Result