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  1. Core Server
  2. SERVER-84487

Support block-based $group with $top/$bottom end-to-end

    • Type: Icon: Task Task
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 8.0.0-rc0
    • Affects Version/s: None
    • Component/s: None
    • Query Execution
    • Fully Compatible
    • 158

      Given a simple timeseries collection:

      ./build/install/bin/mongod --setParameter featureFlagSbeFull=true --setParameter featureFlagTimeSeriesInSbe=true --setParameter logComponentVerbosity='{query: 5}'
      > db.coll.drop()
      > db.createCollection("coll", {timeseries: {timeField: "t"}})
      > db.coll.insert({t: new Date(), a: 4, b: 7, c: 5})
      > db.coll.insert({t: new Date(), a: 2, b: 9, c: 8})
      > db.coll.insert({t: new Date(), a: 3, b: 1, c: 6})
      ..
      

      The goal of this task is to get the following queries working in block-processing mode (and to write a jstest that verifies it works):

      > db.coll.aggregate([{$project: {a: 1, b: 1}}, {$group: {_id: null, x: {$top: {output: ["$a","$b"], sortBy: {b: 1}}}}}])
      
      > db.coll.aggregate([{$project: {a: 1, b: 1}}, {$group: {_id: null, x: {$bottom: {output: ["$a","$b"], sortBy: {b: 1}}}}}])
      > db.coll.aggregate([{$project: {a: 1, b: 1}}, {$group: {_id: "$c", x: {$top: {output: ["$a","$b"], sortBy: {b: 1}}}}}])
      
      > db.coll.aggregate([{$project: {a: 1, b: 1}}, {$group: {_id: "$c", x: {$bottom: {output: ["$a","$b"], sortBy: {b: 1}}}}}])

            Assignee:
            andrew.paroski@mongodb.com Drew Paroski
            Reporter:
            andrew.paroski@mongodb.com Drew Paroski
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              Created:
              Updated:
              Resolved: