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  1. Core Server
  2. SERVER-22123

Add an option to the $sample stage to specify weights to use in the sampling.

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    • Query Optimization
    • Fully Compatible

    Description

      Specifying this option would prevent any optimized random cursor implementation from the storage engine, and would always use a top-k random sort, with the random value used to sort being multiplied by the specified weight.

      For example:

      db.example.aggregate([{
          $sample: {
              size: 100,
              weight: "$myWeightField"
          }
      }]);
      

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            backlog-query-optimization Backlog - Query Optimization
            m3t4lukas Lukas Wagner
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              Created:
              Updated: