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  1. Core Server
  2. SERVER-4589

aggregation: need an array indexing operator

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Details

    • New Feature
    • Status: Closed
    • Major - P3
    • Resolution: Done
    • None
    • 3.1.5
    • Aggregation Framework
    • None
    • Minor Change
    • Quint Iteration 4, Quint Iteration 5

    Description

      At present, there's no way to extract a specific element from an array-valued field. An operator should be added that could be used in a projection, e.g.:

      db.runCommand({aggregate:"c", pipeline:[
      { $project : {
      foo :

      { $at:["$arrayField", 5] }

      }}
      ]});

      The effect of this would be put add the computed field (virtual field) foo to the projection, and give it the value of arrayField[5].

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        Issue Links

          is depended on by

          New Feature - A new feature of the product, which has yet to be developed. JAVA-2001 Projection builder support for array indexing operator

          • Major - P3 - Major loss of function.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-6075 Accessing array elements by position fails in $project

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

          Bug - A problem which impairs or prevents the functions of the product. SERVER-16462 Can't access specific array elements in $group

          • Major - P3 - Major loss of function.
          • Closed
          is related to

          New Feature - A new feature of the product, which has yet to be developed. SERVER-6074 Allow $slice operator in $project

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

          Task - A task that needs to be done. DRIVERS-234 Aggregation Builder Support for 3.2

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

          Bug - A problem which impairs or prevents the functions of the product. SERVER-5299 array element selection syntax returns wrong result

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

          New Feature - A new feature of the product, which has yet to be developed. CSHARP-1400 Support the new array indexing operator

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

          Activity

            People

              charlie.swanson@mongodb.com Charlie Swanson
              dan@mongodb.com Daniel Pasette (Inactive)
              Votes:
              75 Vote for this issue
              Watchers:
              46 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: