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Type:
Bug
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Resolution: Unresolved
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Priority:
Minor - P4
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None
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Affects Version/s: 3.4.10, 3.6.0-rc4
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Query Optimization
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ALL
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3
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In the query language, when a numerical path component is used to select an element of an array, elements are only selected if the numerical path component matches their exact fieldname:
> db.c.insert({_id: 0, a: [0]})
WriteResult({ "nInserted" : 1 })
> db.c.find({"a.00": 0})
> db.c.find({"a.0": 0})
{ "_id" : 0, "a" : [ 0 ] }
In the update language, a numerical path components is parsed as an unsigned base 10 integer n, and we select the nth array element:
> db.c.insert({_id: 0, a: [0]})
WriteResult({ "nInserted" : 1 })
> db.c.update({_id: 0}, {$set: {"a.00": 1}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.c.find()
{ "_id" : 0, "a" : [ 1 ] }