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  1. Core Server
  2. SERVER-22912

Query Optimizer

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Trivial - P5
    • Resolution: Duplicate
    • Affects Version/s: 3.0.9
    • Fix Version/s: None
    • Component/s: Aggregation Framework, Querying
    • Labels:
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      Description

      Feedback from long-term MongoDB community users:

      -index-covered queries will still fetch documents in the aggregation pipeline

      -$group only executes post cursor merge in aggregation pipeline, while it would be more efficient to do it pre-merge.

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          duplicates

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-5477 when sharded, no need to merge groups if $group _id is the shard key or original document _id

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

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-12015 Reenable use of covering indexes with aggregation

          • Critical - P2 - Crashes, loss of data, severe memory leak.
          • Closed

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                • Created:
                  Updated:
                  Resolved: