Details
Major - P3 Description
Regression from 2.4. Presumably never implemented for the IDHack runner?
2.4.9:
> db.foo.find({_id:1},{_id:1}).explain()
|
{
|
"cursor" : "BtreeCursor _id_", |
"isMultiKey" : false, |
"n" : 1, |
"nscannedObjects" : 0, // zero |
"nscanned" : 1, |
"nscannedObjectsAllPlans" : 0, |
"nscannedAllPlans" : 1, |
"scanAndOrder" : false, |
"indexOnly" : true, |
"nYields" : 0, |
"nChunkSkips" : 0, |
"millis" : 0, |
"indexBounds" : { |
"_id" : [ |
[
|
1,
|
1
|
]
|
]
|
},
|
"server" : "Rassi-MacBook-Pro.local:27017" |
}
|
2.6.0-rc0:
> db.foo.find({_id:1},{_id:1}).explain()
|
{
|
"cursor" : "IDCursor", |
"n" : 1, |
"nscannedObjects" : 1, // not zero |
"nscanned" : 1, |
"millis" : 0, |
"indexBounds" : { |
"_id" : [ |
[
|
1,
|
1
|
]
|
]
|
},
|
"server" : "Rassi-MacBook-Pro.local:27017" |
}
|
>
|
Attachments
Issue Links
- is related to
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SERVER-14304 Equality queries on _id with projection on _id may return orphan documents on sharded collections
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- Closed
-