Inclusion projection scenario that falsely writes included field to document

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    • Type: Bug
    • Resolution: Duplicate
    • Priority: Major - P3
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    • Affects Version/s: 4.0.10, 4.3.1
    • Component/s: Aggregation Framework
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      db.coll.drop();
db.coll.insert({});
db.coll.createIndex({"str": 1});

var result =
    db.coll.aggregate([{$match: {'str': {$not: {$eq: ''}}}},
                                         {$project: {"str": 1, "_id": 0}}]).toArray();
assert.eq({}, result[0]);
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      db.coll.drop(); db.coll.insert({}); db.coll.createIndex({ "str" : 1}); var result = db.coll.aggregate([{$match: { 'str' : {$not: {$eq: ''}}}}, {$project: { "str" : 1, "_id" : 0}}]).toArray(); assert .eq({}, result[0]);
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      In the reproduction below an aggregate with match and inclusion projection writes the included field to the output document. It should instead produce an empty document. This is consistently reproducible on 4.0.10 and occurs sporadically on master and 4.2.0-rc0.

      The assertion fails with the following error:

      assert: [{ }] != [{ "str" : null }] are not equal

              Assignee:
              James Wahlin
              Reporter:
              James Wahlin
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                Created:
                Updated:
                Resolved: