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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.

duplicates

SERVER-4507 aggregation: optimize $group to take advantage of sorted sequences

related to

SERVER-21471 Bad index selection on aggregate with $match + $sort

Assignee:: Unassigned
Reporter:: Benjamin Appréderisse
Participants:: Benjamin Appréderisse, Charlie Swanson, Ramon Fernandez Marina
Votes:: 0 Vote for this issue
Watchers:: 6 Start watching this issue