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  1. Core Server
  2. SERVER-58587

Improve performance of $setIsSubset by replacing std::set with an unordered set

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    • Type: Icon: New Feature New Feature
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 5.1.0-rc0
    • Affects Version/s: None
    • Component/s: None
    • Labels:
      None
    • Fully Compatible
    • v5.0, v4.4
    • QE 2021-08-09

      The $setIsSubset currently uses std::set to creating a lookup table on the RHS array elements. We should replace this with stdx::unordered_set which provides 3-4x performance for large data sets.

        1. patch-1
          9 kB

            Assignee:
            rui.liu@mongodb.com Rui Liu
            Reporter:
            arun.banala@mongodb.com Arun Banala
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              Created:
              Updated:
              Resolved: