Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{arr:["a","b","c"]},{arr:["b","c","d"]},{arr:["c","d","e"]},{arr:["d","e","f"]}]
Query
db.collection.find({arr:{$in:["a","b",]}},{_id:0})
Result