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  1. C Driver
  2. CDRIVER-2764

aggregate inherits writeConcern only if the "pipeline" parameter contains a "pipeline" field

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.13.0
    • Component/s: libmongoc
    • Labels:
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      Description

      mongo_collection_aggregate used to accept only a document that includes a "pipeline" array. A pipeline that includes an $out stage looks like:

      {pipeline: [{...}, {$out: ...}]}
      

      If the function finds "$out" but there's no explicit writeConcern then it inherits the collection's writeConcern, per spec.

      In CDRIVER-2606 we also accept a BSON array passed directly, not as an element of the input document. That work was incomplete: if mongoc_collection_aggregate is passed a BSON array directly then it doesn't search the array for "$out" and doesn't inherit writeConcern from its collection object.

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