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  1. Core Server
  2. SERVER-5919

Add set/array operations to $unwind in new aggregation framework

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    • Icon: Improvement Improvement
    • Resolution: Duplicate
    • Icon: Minor - P4 Minor - P4
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    • Aggregation Framework
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    • Fully Compatible

    Description

      $unwind operates on a single array field. sometimes tag-like information can be stored in multiple document fields. it may be useful to allow $unwind to operate on multiple array fields whose contents have been combined by some set/array operation. this could help users group by values that are contained across multiple fields.

      i.e.

      {x: [s1, s2], y: [s2, s3]}

      $unwind(x).$unwind(y) would create four documents.

      would something like $unwind($union(x,y)) and group on $union(x,y) be possible/desirable?

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            Unassigned Unassigned
            kaleigh@renttherunway.com kaleigh smith
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              Updated:
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