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  1. Core Server
  2. SERVER-94533

FCV downgrade during distinct command can cause malformed query plan

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    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 8.1.0-rc0
    • Affects Version/s: None
    • Component/s: None
    • Query Optimization
    • Fully Compatible
    • ALL
    • 0

      A single distinct command checks the Feature Compatibility Version (FCV) multiple times to determine if it should use multi-planning. If a downgrade occurs concurrently with the command, it is possible for command execution to prepare for multi-planning at first but then assume multi-planning is off later in the command.

            Assignee:
            alya.berciu@mongodb.com Alya Berciu
            Reporter:
            justin.seyster@mongodb.com Justin Seyster
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              Created:
              Updated:
              Resolved: