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  1. Core Server
  2. SERVER-25897

Add a priming stage to Pipeline execution to help determine if further optimization can happen.

    • Query Optimization

      If the $group stage spills to disk, then the results will be output in order of their _id. If this is the case, we could potentially take advantage of this knowledge, by removing a subsequent sort on _id, or by making a subsequent group convert to streaming.

      We should add some sort of prep stage to pipeline execution, so that we will know if the $group is going to spill to disk before we have to make decisions on whether outputs are sorted.

            backlog-query-optimization Backlog - Query Optimization
            charlie.swanson@mongodb.com Charlie Swanson
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