Optimize $sample+$project

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    • Type: Improvement
    • Resolution: Duplicate
    • Priority: Minor - P4
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    • Affects Version/s: None
    • Component/s: Aggregation Framework
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    • Query
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    • 3
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      When performing a pipeline doing a sample then project I noticed it was much slower than doing a project then sample. Could this be optimized? In a similar fashion as to: https://docs.mongodb.com/manual/core/aggregation-pipeline-optimization

      For example with the MovieLens dataset ~1million documents:

      Pipeline: $sample + $project _id: 76120 ms
      Pipeline: $project _id + $sample: 1124 ms

              Assignee:
              Backlog - Query Team (Inactive)
              Reporter:
              Ross Lawley
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                Created:
                Updated:
                Resolved: