Query's projection does not obey partial inclusion or exclusion of _id

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    • Minor Change
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    • Query 2019-11-04
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      > db.a.find()
{ "_id" : { "a" : 1, "b" : 1 }, "v" : 123 }
{ "_id" : { "a" : 1, "b" : 2 }, "v" : 345 }
{ "_id" : { "a" : 2, "b" : 2 }, "v" : 222 }
{ "_id" : { "a" : 2, "b" : 1 }, "v" : 567 }
> db.a.find({}, {'_id.a':1})  // Should only include "_id.a".
{ "_id" : { "a" : 1, "b" : 1 } }
{ "_id" : { "a" : 1, "b" : 2 } }
{ "_id" : { "a" : 2, "b" : 2 } }
{ "_id" : { "a" : 2, "b" : 1 } }
> db.a.find({}, { '_id.b':0})  // Should exclude "_id.b".
{ "_id" : { "a" : 1, "b" : 1 }, "v" : 123 }
{ "_id" : { "a" : 1, "b" : 2 }, "v" : 345 }
{ "_id" : { "a" : 2, "b" : 2 }, "v" : 222 }
{ "_id" : { "a" : 2, "b" : 1 }, "v" : 567 }

              Assignee:
              Ian Boros
              Reporter:
              Mathias Stearn
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                Created:
                Updated:
                Resolved: