OPERATIONAL DEFECT DATABASE
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Documents with empty arrays can be matched using the $size operator on the array field using the number -(2 ^ 63) as an argument. This problem affects 2.5.x of MongoDB but not 2.4.x.
xgen-internal-githook commented on Mon, 30 Dec 2013 17:34:28 +0000: Author: {u'username': u'dstorch', u'name': u'David Storch', u'email': u'david.storch@10gen.com'} Message: SERVER-11952 fix $size match expression parsing for negative longs Signed-off-by: Matt Kangas Branch: master https://github.com/mongodb/mongo/commit/44a01e7e4f4e86933ea792c1d110542d66560b6c
2.4.9-pre- > db.a.insert({arr:[]}) > db.a.find({arr:{$size:NumberLong("-9223372036854775808")}}) > 2.5.5-pre- > db.a.insert({arr:[]}) Insert WriteResult({ "ok" : 1, "n" : 1 }) > db.a.find({arr:{$size:NumberLong("-9223372036854775808")}}) { "_id" : ObjectId("529f77fca01bf21d39c74b48"), "arr" : [ ] } >
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