dot notation of projections doesn't work on embedded "_id" field

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    • Type: Bug
    • Resolution: Duplicate
    • Priority: Minor - P4
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    • Affects Version/s: 3.0.2
    • Component/s: Querying
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      db.test.save({ "_id" : { "d" : "x", "f" : "z" }})
db.test.find({},{"_id.d":1})  // should return {_id:{d:"x"}} instead of { "_id" : { "d" : "x", "f" : "z" }}
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      db.test.save({ "_id" : { "d" : "x" , "f" : "z" }}) db.test.find({},{ "_id.d" :1}) // should return {_id:{d: "x" }} instead of { "_id" : { "d" : "x" , "f" : "z" }}
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      If "_id" is an embedded field, then dot notation of projections doesn't work on that field.
      I think "_id" field should be able to projection to avoid unnecessary data transform

            Assignee:
            Unassigned
            Reporter:
            Jia Hongchao
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              Created:
              Updated:
              Resolved: