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  1. Core Server
  2. SERVER-55464

Optimize pipelines with $sort after $setWindowFields where possible

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    • Type: Icon: Improvement Improvement
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 5.0.0-rc0
    • Affects Version/s: None
    • Component/s: None
    • None
    • Fully Compatible
    • Query Optimization 2021-04-05, Query Optimization 2021-04-19, Query Optimization 2021-05-03, Query Optimization 2021-05-17

      Semantically, the $setWindowFields stage does not guarantee an output order so users may add a $sort stage to get the order they want. Since the physical implementation for $setWindowFields happens to have a guaranteed order, we should drop (or coalesce or swap) the user $sort if its not necessary.

            Assignee:
            david.percy@mongodb.com David Percy
            Reporter:
            nicholas.zolnierz@mongodb.com Nicholas Zolnierz
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              Created:
              Updated:
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