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  1. Core Server
  2. SERVER-44828

Correct logic to re-compute dependencies after absorbing a $sort into query layer

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    • Backwards Compatibility:
      Fully Compatible
    • Operating System:
      ALL
    • Backport Requested:
      v4.0, v3.6
    • Sprint:
      Query 2019-12-02, Query 2019-12-16
    • Case:

      Description

      SERVER-39109 inadvertently thwarted an optimization to re-compute the set of fields needed for the aggregation. Instead of re-computing the dependencies in such a scenario, it will get confused because the $cursor stage has already been added and mistakenly report that all fields are needed for the aggregation. We should restore the optimization.

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