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  1. Core Server
  2. SERVER-27496

allow self-$lookup on shard key value equality pre-merge on a sharded collection

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Details

    • Improvement
    • Status: Backlog
    • Major - P3
    • Resolution: Unresolved
    • None
    • None
    • Aggregation Framework, Sharding
    • None

    Description

      In cases where there is no merge stage (or we are before it), it may be possible to allow self-lookup on sharded collection if the local and foreign field is the same and it's the shard key.

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          depends on

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-29159 Allow "from" collection of $lookup to be sharded

          • 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-28705 Add optimization to execute $lookup on local shards when possible

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

          Activity

            People

              backlog-query-optimization Backlog - Query Optimization
              asya.kamsky@mongodb.com Asya Kamsky
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              Dates

                Created:
                Updated: