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Type:
Task
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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: None
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Component/s: Aggregation Framework
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Query Execution
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None
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It is rather awkward that to get topN array elements, you would do $sortArray+$slice while there's topN accumulator available.
Proposing:
$topN: {input: <expression resolving to array>, n: <n expression>, sortBy: <spec>}
e.g.:
[
{
$set: {
topThreeOptions: {
$topN: {
input: "$options",
n: 3,
sortBy: { votes: -1 },
},
},
fiveWatchersAZ: {
$topN: {
input: "$watchers",
n: 5,
sortBy: 1
},
},
},
},
]
- related to
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SERVER-59149 Add $top/$bottom/$topN/$bottomN as expressions
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- Closed
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