Details
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Improvement
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Status: Closed
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Minor - P4
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Resolution: Duplicate
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None
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None
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None
Description
It would be great for a $group stage to use indexes for easy group.
For example, this aggregation
[
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{
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$group: {
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_id: "$media",
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count: {$sum:1}
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}
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},
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{
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$sort: {
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count: 1
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}
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},
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{
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$limit: 10
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}
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]
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is not using the "media" index.
Attachments
Issue Links
- duplicates
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- Backlog
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- related to
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SERVER-21471 Bad index selection on aggregate with $match + $sort
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- Closed
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