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  1. Core Server
  2. SERVER-92325

$group + $topN sometimes returns different results

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    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 8.1.0-rc0, 8.0.0-rc14
    • Affects Version/s: 8.1.0-rc0, 8.0.0-rc11
    • Component/s: None
    • None
    • Query Optimization
    • Fully Compatible
    • ALL
    • v8.0

      See attached repro script. This is not reproducible on 7.0. If you re-run the same script several times in a row, eventually you get results like:

      Enterprise test> load("script.js")
[ { _id: 'D', tzdotz1: [], tzdotz2: [], tadotz1: [], tadotz2: [] } ]
true
Enterprise test> load("script.js")
[
  {
    _id: 'D',
    tadotz1: [ [] ],
    tadotz2: [ [] ],
    tzdotz1: [],
    tzdotz2: []
  }
]
true

        1. script.js
          3 kB

            Assignee:
            alya.berciu@mongodb.com Alya Berciu
            Reporter:
            alya.berciu@mongodb.com Alya Berciu
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              Created:
              Updated:
              Resolved: