Investigate match_expression::addDependencies() creating empty fields when not needed

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    • Type: Bug
    • Resolution: Unresolved
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: None
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    • Query Optimization
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    • 3
    • TBD
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      During work for SERVER-101795, the dependency set that match_expression::addDependencies() outputs for 

      {$match: {a: {$elemMatch: {$elemMatch: {$eq: 0}, $eq: 0}}}}

        is [a, ""]. It was brought up in code review that the empty string outputted here seems to be incorrect/unnecessary as a is the only relevant path. There may be other queries that also generate empty string dependencies when not needed and it could potentially inhibit query optimization.

       

            Assignee:
            Unassigned
            Reporter:
            Erin Zhu
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              Created:
              Updated: