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Type:
Bug
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Resolution: Duplicate
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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None
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Query Execution
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ALL
In the classic engine, $lookup (specified with localField/foreignField syntax) fails when a local field is undefined:
> db.foo.find()
{ "_id" : ObjectId("672b7fa1046b20cdaa4eba47"), "a" : undefined }
> db.foo.aggregate([{$lookup: {from: "foo", localField: "a", foreignField: "a", as: "res"}}])
uncaught exception: Error: command failed: {
"ok" : 0,
"errmsg" : "PlanExecutor error during aggregation :: caused by :: cannot compare to undefined",
"code" : 2,
"codeName" : "BadValue"
}
But with SBE enabled, this query succeeds:
> db.foo.find()
{ "_id" : ObjectId("672b7fa1046b20cdaa4eba47"), "a" : undefined }
> db.foo.aggregate([{$lookup: {from: "foo", localField: "a", foreignField: "a", as: "res"}}])
{ "_id" : ObjectId("672b7fa1046b20cdaa4eba47"), "a" : undefined, "res" : [ { "_id" : ObjectId("672b7fa1046b20cdaa4eba47"), "a" : undefined } ] }
- duplicates
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- Closed
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