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  1. Core Server
  2. SERVER-22402

Add dependency tracking to the $match stage

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    • Fully Compatible
    • Query 10 (02/22/16), Query 11 (03/14/16)

    Description

      Currently DocumentSourceMatch does not implement getDependencies, which means that we cannot tell which fields will be needed by the match stage, and hence must ask for all fields. This can limit our ability to project out unneeded fields.

      We should add an implementation of getDependencies that will look at it's MatchExpression to determine which fields are needed.

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          related to

          Bug - A problem which impairs or prevents the functions of the product. SERVER-30342 Slow performance of $project in aggregation pipeline in 3.4.6

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-22631 Improve efficiency of matching during an aggregation pipeline.

          • Major - P3 - Major loss of function.
          • Closed

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              benjamin.murphy Benjamin Murphy
              charlie.swanson@mongodb.com Charlie Swanson
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