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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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    • Type: Icon: Improvement Improvement
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Aggregation Framework, Sharding
    • Labels:
      None
    • Query Optimization

      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.

            Assignee:
            backlog-query-optimization [DO NOT USE] Backlog - Query Optimization
            Reporter:
            asya.kamsky@mongodb.com Asya Kamsky
            Votes:
            1 Vote for this issue
            Watchers:
            9 Start watching this issue

              Created:
              Updated: