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  1. Core Server
  2. SERVER-21502

$group using index

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    • Type: Icon: Improvement Improvement
    • Resolution: Duplicate
    • Priority: Icon: Minor - P4 Minor - P4
    • None
    • Affects Version/s: None
    • Component/s: Aggregation Framework
    • Labels:
      None

      It would be great for a $group stage to use indexes for easy group.

      For example, this aggregation

      [
{
    $group: {
        _id: "$media",
        count: {$sum:1}
    }
},
{
    $sort: {
        count: 1
    }
},
{
    $limit: 10
}
]

      is not using the "media" index.

            Assignee:
            Unassigned Unassigned
            Reporter:
            bappr Benjamin Appréderisse
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              Created:
              Updated:
              Resolved: