Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"isNull":null,"isNotNull":0}]
Query
db.collection.aggregate([{$set:{_id:"$$REMOVE",isNull:{$eq:["$isNull",null]},isNotNull:{$eq:["$isNotNull",null]}}}])
Result