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Type:
Bug
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Resolution: Fixed
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Priority:
Critical - P2
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Affects Version/s: None
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Component/s: Querying
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Fully Compatible
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ALL
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v4.0, v3.6, v3.4, v3.2
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Query 2018-06-18, Query 2018-07-02, Query 2018-07-16, Query 2018-07-30, Query 2018-08-13
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None
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It appears that when covered index can be used, but collation isn't involved in match or sort then the strings from covered index query are returned without being looked up.
db.stringtest.insertOne({ int: 1, text: "hello world" });
db.stringtest.createIndex({ int: -1, text: -1 }, { collation: { locale: "en", strength: 1 }});
db.stringtest.find({ int: 1 }, { _id: 0, int: 1, text: 1 })
// expected result { int: 1, text: "hello world" }
// actual result
{"int" : 1, "text" : "71??E\u0004UEK?/" }