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  1. Core Server
  2. SERVER-54822

Push $sort before $unwind when possible

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: 4.4.4
    • Fix Version/s: 5.1.0
    • Component/s: None
    • Labels:
    • Backwards Compatibility:
      Fully Compatible
    • Sprint:
      Query Optimization 2021-05-17, Query Optimization 2021-05-31, Query Optimization 2021-06-14, Query Optimization 2021-06-28

      Description

      $sort should be pushed automatically before $unwind if sort is happening on a different field.
      E.g.

      db.foo.aggregation([{$unwind: "fieldA"},{$sort: { fieldB: 1}}])

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          Issue Links

          is related to

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-26442 Push $sort before $project and $addFields

          • Major - P3 - Major loss of function.
          • Open
          related to

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-55417 Conditionally reorder $sort and $lookup depending on whether the query planner allows for an index-provided sort

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

            Activity

              People

              Assignee:
              militsa.sotirova Militsa Sotirova
              Reporter:
              renato.riccio Renato Riccio
              Participants:
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                Dates

                Created:
                Updated:
                Resolved: