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Type:
New Feature
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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: None
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Component/s: Aggregation Framework
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None
Here's the use case.
I need a sorted array of elements within a document:
[
...
{
$group: {
"_id": "$athing",
"anArray": {$push :"$aVal"}
}
},
{ $addFields : { "sortedArr" : { $sort :"$anArray" } } }, //something like this
...
]
Now, I could sort before the grouping, but that'll only work if the data set is small. If I have a much smalled subset of the data, sorting it would be much faster.
...
[
...
{ $sort : { "aVal" : -1 } }, //Does not work for very large data sets
{
$group: {
"_id": "$athing",
"sortedArr": {$push :"$aVal"}
}
},
...
]
- duplicates
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SERVER-29425 Add an expression to sort an array
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- Closed
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