[Feature Request] Non Distinct Query / Distinct Options

[dplewis]

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Finding non unique values

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Looking for fields with duplicates.
Maybe add a parameter for number of duplicates like 1, 2, or 3, $gt / $eq

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Currently using the following.

It groups all field values to be unique but keeps count of how many objects had that value.
If more than one object had that value its not unique.

db.collection.aggregate([
    { "$group": {
        "_id": "$field",
        "count": { "$sum": 1 }
    }},
    { "$match": {
        "count": { "$gt": 1 }
    }}
])

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[flovilmart]

Closing as a reasonable workaround is available. Adding a new API just for that seems overkill.