[{_id:ObjectId("63be16e7096c04c6f351c60c"),city:"Rio",economy:"Tourism",population:6000000,date:ISODate("2019-01-04T03:00:00.000+00:00")}]

db.collection.find({$expr:{$and:[{$or:[{$eq:[null,"Rio"/** self.city_entry*/]},{$eq:["$city","Rio"/** self.city_entry*/]}]},{$or:[{$eq:[null,null/** self.economy_entry*/]},{$eq:["$economy",null/** self.economy_entry*/]}]},{$or:[{$eq:[null,null/** self.population_entry*/]},{$eq:["$population",null/** self.population_entry*/]}]},{$or:[{$eq:[null,null/** self.date_entry*/]},{$eq:["$date",null/** self.date_entry*/]}]}]}})