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if you have something like
db.users.save(

{ name : "" , address... , etc... }

)
db.users.ensureIndex(

{ name : 1 }

)
and you do
db.users.find( {} ,

{ name : 1 }

)
it should only look at the index and never go to object.

depends on

SERVER-822 Field exclusion on _id should actually exclude _id

is depended on by

SERVER-2104 covered index should support dotted fields

SERVER-2109 Query optimizer should pick plans that can use covered indexes