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  1. Core Server
  2. SERVER-24799

$group aggregation command should maintain document order

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Won't Fix
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: Aggregation Framework
    • Labels:
      None
    • Backwards Compatibility:
      Fully Compatible

      Description

      I just wasted a ton of time before realizing that $group doesn't group by the order of input documents. This is incredibly counter-intuitive and makes the already-complicated aggregation more complex to understand. I don't see why $group shouldn't guarantee input order, and it would be very helpful if it did.

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          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-41891 $group on sorted cursor forces full collection scan

          • Major - P3 - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. SERVER-43029 sort before group, without changing key...

          • Major - P3 - Major loss of function.
          • Closed

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                Dates

                • Created:
                  Updated:
                  Resolved: