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  1. Core Server
  2. SERVER-28705

Add optimization to execute $lookup on local shards when possible

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

      Performing joins using local shard indices is cheap. In this setup, parent-child relationships can be implemented as long parent and child documents live on the same shard through proper routing by application developers. This feature is similar to ElasticSearch has_parent and has_child queries. $joinOne works with a single object while $joinMany works with an array of objects.

            Assignee:
            backlog-query-optimization [DO NOT USE] Backlog - Query Optimization
            Reporter:
            geekox86 Mohannad Saeed
            Votes:
            2 Vote for this issue
            Watchers:
            14 Start watching this issue

              Created:
              Updated:
              Resolved: