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  1. Core Server
  2. SERVER-14303

Allow aggregation $group operator to use an index

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: Major - P3 Major - P3
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    Description

      Given an index on {a:1, b:1, c:1}, the following aggregations could make use of it to run more efficiently

      db.foo.aggregate([{$group: {_id: "$a", b_sum: {$sum: '$b'}}}])
      db.foo.aggregate([{$group: {_id: {a: "$a", b: "$b"}, c_sum: {$sum: '$c'}}}])

      And other similar aggregations

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            Unassigned Unassigned
            joanna.cheng@mongodb.com Joanna Cheng
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