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Type:
Bug
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Resolution: Done
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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: Index Maintenance, Querying
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Labels:
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Major Change
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ALL
Seems like in 2.4 with certain indexes enabled the results returned from $not against empty fields changes. This behavior is not continued in 2.5, which is probably correct.
In 2.5:
> db.rep.insert({_id:0})
SingleWriteResult({
"writeErrors" : [ ],
"writeConcernErrors" : [ ],
"nInserted" : 1,
"nUpserted" : 0,
"nUpdated" : 0,
"nModified" : 0,
"nRemoved" : 0,
"upserted" : [ ]
})
> db.rep.find({a:{$not: {$gt:1}}})
{ "_id" : 0 }
> db.rep.ensureIndex({a:1})
> db.rep.find({a:{$not: {$gt:1}}})
{ "_id" : 0 }
> db.runCommand({buildinfo:1})
{
"version" : "2.5.5-pre-",
"gitVersion" : "f65a0b814b8c77e3fbe90bca0c061c9b77f6acdb",
"OpenSSLVersion" : "",
"sysInfo" : "Darwin Andrew-Emil-MacBook-Pro.local 12.4.0 Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49",
"loaderFlags" : "-fPIC -pthread -Wl,-bind_at_load -mmacosx-version-min=10.6",
"compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -Werror -pipe -O3 -Wno-unused-function -Wno-deprecated-declarations -mmacosx-version-min=10.6",
"allocator" : "tcmalloc",
"versionArray" : [
2,
5,
5,
-100
],
"javascriptEngine" : "V8",
"bits" : 64,
"debug" : false,
"maxBsonObjectSize" : 16777216,
"ok" : 1
}
In 2.4:
> mydb.rep.insert({_id:0})
> mydb.rep.find({a:{$not: {$gt:1}}})
{ "_id" : 0 }
> mydb.rep.ensureIndex({a:1})
> mydb.rep.find({a:{$not: {$gt:1}}})
>