[SERVER-22912] Query Optimizer Created: 01/Mar/16  Updated: 02/Mar/16  Resolved: 01/Mar/16

Status: Closed
Project: Core Server
Component/s: Aggregation Framework, Querying
Affects Version/s: 3.0.9
Fix Version/s: None

Type: Improvement Priority: Trivial - P5
Reporter: Taelen Lewis Assignee: Unassigned
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Duplicate
duplicates SERVER-5477 when sharded, no need to merge groups... Backlog
duplicates SERVER-12015 Reenable use of covering indexes with... Closed
Participants:

 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.



 Comments   
Comment by Charlie Swanson [ 01/Mar/16 ]

Hi taelen.lewis,

I think that both of these requests have existing tickets (one of which has already been fixed!), which I have linked as duplicates. If you can think of a case in which the $group merging can be improved other than the case described in SERVER-5477, please let us know

Thanks!
-Charlie

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