At the moment, returnKey with an all paths index causes the query to fail uncleanly. This can be reproduced as follows:
db.c.drop();
db.c.createIndex({"$**": 1});
db.c.insert({a: 1});
db.c.find({a: 1}).hint({"$**": 1}).returnKey().itcount();
- is depended on by
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SERVER-36198 Enable $** index builds by default in non-test configurations
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- Closed
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