$addToSet group operator should maintain insert order

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    • Type: Improvement
    • Resolution: Won't Fix
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: Aggregation Framework
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      Currently uses an unordered_set<>. Needs to maintain insert order so a pipeline like this has the original comment order:

      db.posts.aggregate(
    {$unwind: 'comments'},
    {$match: {'comments.deleted': {$ne: true}}},
    {$group: {_id: '$_id', comments: {$addToSet: '$comments'}}}
);

            Assignee:
            Unassigned
            Reporter:
            Mathias Stearn
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              Created:
              Updated:
              Resolved: