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  1. Core Server
  2. SERVER-19095

$lookup

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    • Type: Icon: New Feature New Feature
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 3.2.0-rc2
    • Affects Version/s: None
    • Component/s: Aggregation Framework
    • None
    • Fully Compatible
    • Quint Iteration 7, QuInt 8 08/28/15, Quint 9 09/18/15, QuInt A (10/12/15)

      Summary

      Add a $lookUp operator to the aggregation pipeline to pull data from one collection into a pipeline executed on a different collection.

      Goals

      • Aggregation stage to do left outer join
      • Works across any shard/collection boundary
        • left-hand side sharded, right-hand side unsharded

      Non-Goals

      • Enforced collocation of “related” chunks.
      • More parallelization for agg
      • Small collections that co-exist on all shards (aka, “enum” collections)

      Examples

      Forthcoming

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              Created:
              Updated:
              Resolved: