Covered Query returns null for unset fields

XMLWordPrintableJSON

    • Type: Bug
    • Resolution: Duplicate
    • Priority: Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Querying
    • None
    • ALL
    • Hide 
      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 }
      Show
      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 }
    • None
    • 3
    • None
    • None
    • None
    • None
    • None
    • None
    • None

      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
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

                Created:
                Updated:
                Resolved: