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  1. Core Server
  2. SERVER-30449

ProjectionSpecValidator is O(N**2) in number of fields in the projection

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    • Fully Compatible
    • ALL
    • v3.4
    • Query 2017-09-11, Query 2017-10-02, Query 2017-10-23

    Description

      If it held the _seenPaths in a std::set() rather than a vector, it could check for prefix issues in O(N*logN) time. It may also be possible to use a StringMap to do it in O(N).

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          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-30633 Large performance regression for large aggregation queries

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

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              bernard.gorman@mongodb.com Bernard Gorman
              mathias@mongodb.com Mathias Stearn
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                Updated:
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