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Type:
Bug
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Resolution: Done
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Priority:
Critical - P2
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Affects Version/s: 2.6.0-rc2
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Component/s: Index Maintenance
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Please see the queries below performed on 2.6.0-rc2. When the query includes a .sort() no records are returned. When the .sort() is removed, the expected records are returned. The .explain() on the sorted version looks quite strange to me.
> db.version()
2.6.0-rc2
> db.config.users.find({},{un:1,pe:1,cre:1})
{ "_id" : ObjectId("53362b393004cde05e1ae35c"), "un" : "cailin.nelson@10gen.com", "cre" : ISODate("2014-03-29T02:08:57.062Z"), "pe" : "cailin.nelson@10gen.com" }
{ "_id" : ObjectId("533633aa300495bc76c058cb"), "un" : "cowboy@johnandcailin.com", "cre" : ISODate("2014-03-29T02:44:58.941Z"), "pe" : "cowboy@johnandcailin.com" }
{ "_id" : ObjectId("533633b2300495bc76c058d1"), "un" : "alberta@johnandcailin.com", "cre" : ISODate("2014-03-29T02:45:06.299Z"), "pe" : "alberta@johnandcailin.com" }
> db.config.users.find({$or:[{un: /cailin/},{pe:/cailin/}]},{un:1}).sort({cre:-1}).limit(10).skip(0).count()
3
> db.config.users.find({$or:[{un: /cailin/},{pe:/cailin/}]},{un:1}).sort({cre:-1}).limit(10).skip(0)
> db.config.users.find({$or:[{un: /cailin/},{pe:/cailin/}]},{un:1}).sort({cre:-1}).limit(10).skip(0).explain()
{
"cursor" : "BtreeCursor createdIdx reverse",
"isMultiKey" : false,
"n" : 0,
"nscannedObjects" : 0,
"nscanned" : 1,
"nscannedObjectsAllPlans" : 0,
"nscannedAllPlans" : 1,
"scanAndOrder" : false,
"indexOnly" : false,
"nYields" : 0,
"nChunkSkips" : 0,
"millis" : 0,
"indexBounds" : {
"cre" : [
[
/cailin/,
/cailin/
],
[
{
},
""
]
]
},
"server" : "cailinmac:27017",
"filterSet" : false
}
> db.config.users.find({$or:[{un: /cailin/},{pe:/cailin/}]},{un:1}).limit(10).skip(0)
{ "_id" : ObjectId("533633b2300495bc76c058d1"), "un" : "alberta@johnandcailin.com" }
{ "_id" : ObjectId("53362b393004cde05e1ae35c"), "un" : "cailin.nelson@10gen.com" }
{ "_id" : ObjectId("533633aa300495bc76c058cb"), "un" : "cowboy@johnandcailin.com" }
>
If I downgrade to 2.4.6, then the expected results are returned with the .sort()
[scripts] (feature_mmsp_1468)$ mongo
MongoDB shell version: 2.4.6
connecting to: test
> db.version()
2.4.6
> use mmsdbconfig
switched to db mmsdbconfig
> db.config.users.find({},{un:1,pe:1,cre:1})
{ "_id" : ObjectId("53362b393004cde05e1ae35c"), "un" : "cailin.nelson@10gen.com", "cre" : ISODate("2014-03-29T02:08:57.062Z"), "pe" : "cailin.nelson@10gen.com" }
{ "_id" : ObjectId("533633aa300495bc76c058cb"), "un" : "cowboy@johnandcailin.com", "cre" : ISODate("2014-03-29T02:44:58.941Z"), "pe" : "cowboy@johnandcailin.com" }
{ "_id" : ObjectId("533633b2300495bc76c058d1"), "un" : "alberta@johnandcailin.com", "cre" : ISODate("2014-03-29T02:45:06.299Z"), "pe" : "alberta@johnandcailin.com" }
> db.config.users.find({$or:[{un: /cailin/},{pe:/cailin/}]},{un:1}).sort({cre:-1}).limit(10).skip(0)
{ "_id" : ObjectId("533633b2300495bc76c058d1"), "un" : "alberta@johnandcailin.com" }
{ "_id" : ObjectId("533633aa300495bc76c058cb"), "un" : "cowboy@johnandcailin.com" }
{ "_id" : ObjectId("53362b393004cde05e1ae35c"), "un" : "cailin.nelson@10gen.com" }