Covered Query returns null for unset fields

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    • Type: Bug
    • Resolution: Duplicate
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: Querying
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      db.widget.save({a:1})
db.widget.find({a:1}, {b:1, _id:0})
{ }
db.widget.ensureIndex({a:1, b:1})
db.widget.find({a:1}, {b:1, _id:0})
{ "b" : null }
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      db.widget.save({a:1}) db.widget.find({a:1}, {b:1, _id:0}) { } db.widget.ensureIndex({a:1, b:1}) db.widget.find({a:1}, {b:1, _id:0}) { "b" : null }
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      A covered query returns null instead of unset for values not present in a record. This means the result of the query can change depending on whether it's covered by an index or not.

            Assignee:
            David Storch
            Reporter:
            Gar Higgins
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              Created:
              Updated:
              Resolved: