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  1. Core Server
  2. SERVER-36254

No index support for filtering on array fields inside $expr operator

    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 3.6.4
    • Component/s: Aggregation Framework
    • None
    • ALL

      I have a collection containing the following documents:

      The index below is defined:

      I'm testing an aggregation with a single $match stage:

      It returns the second document as expected, but without index support:

      I discovered this strange behavior when testing a $lookup stage with an internal pipeline, where $expr operator is a must.

      BTW - I'm aware of this issue. I have tested non-array fields and indeed indexes are used for them.

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            Assignee:
            nick.brewer Nick Brewer
            Reporter:
            cbartosiak Cezary Bartosiak
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              Created:
              Updated:
              Resolved: