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  1. Core Server
  2. SERVER-37304

Extend $sort+$group+$first pipeline optimization to $last

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      The optimization described in SERVER-9507 can be applied to $group expressions that exclusively use $last accumulators by running the DISTINCT_SCAN in the reverse direction.

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          Improvement - An improvement or enhancement to an existing feature or task. SERVER-9507 Optimize $sort+$group+$first pipeline to avoid full index scan

          • Major - P3 - Major loss of function.
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