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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: 2.4.8, 2.6.3
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Component/s: Index Maintenance, Querying
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Labels:None
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ALL
given the following collection:
db.test.find().pretty()
{
"_id" : ObjectId("53fe2798a3cfa2769eb8ca96"),
"name" : "jon",
"a" : [
{
"someDate" : ISODate("2011-02-28T12:49:00Z")
},
{
"someDate" : ISODate("2011-03-31T11:56:00Z")
},
{
"someDate" : ISODate("2012-12-03T20:22:00Z")
}
]
}
and the following indexes:
db.test.getIndexes()
[
{
"v" : 1,
"key" : {
"_id" : 1
},
"ns" : "db.test",
"name" : "_id_"
},
{
"v" : 1,
"key" : {
"a.someDate" : 1
},
"ns" : "db.test",
"name" : "a.someDate_1"
}
]
here is the explain of the query:
db.test.find({'a' :{$elemMatch : {'someDate':{$gte:ISODate("2011-03-01T00:00:00"), $lte:ISODate("2011-05-01T00:00:00")}}}}).explain()
{
"cursor" : "BtreeCursor a.someDate_1",
"isMultiKey" : true,
"n" : 1,
"nscannedObjects" : 2,
"nscanned" : 2,
"nscannedObjectsAllPlans" : 2,
"nscannedAllPlans" : 2,
"scanAndOrder" : false,
"indexOnly" : false,
"nYields" : 0,
"nChunkSkips" : 0,
"millis" : 0,
"indexBounds" : {
"a.someDate" : [
[
ISODate("2011-03-01T00:00:00Z"),
ISODate("0NaN-NaN-NaNTNaN:NaN:NaNZ")
]
]
},
"server" : "local":27017"
}
1. the collection is being scanned twice
2. upper index bound is NaN
I would expect the index to be used for this range query with proper lower/upper bounds.
- duplicates
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SERVER-15086 Allow for efficient range queries over non-array fields in multikey indices
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- Closed
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- related to
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- Closed
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- Closed
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