Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"_id":100,"narr":[{"field":1}]},{"_id":101,"narr":[{"field":1,},{"field":2}]}]
Query
db.collection.find({$expr:{$eq:["$narr.field",[1,2]]}})
Result