[SERVER-5224] support index-only queries under aggregation pipelines Created: 06/Mar/12  Updated: 15/Aug/12  Resolved: 30/Mar/12

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

Type: Improvement Priority: Major - P3
Reporter: Chris Westin Assignee: Chris Westin
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
depends on SERVER-4644 aggregation: optimize memory utilitz... Closed
Duplicate
duplicates SERVER-5090 aggregation: use covered index Closed
Related
related to SERVER-3642 make sure yieldSometimes RecordNeeds ... Closed
Participants:

 Description   

The aggregation framework doesn't currently have a notion of which fields are referenced, but this will come with SERVER-4644. Once that is in place, the arguments to ClientCursor::yieldSometimes() should be improved to take advantage of index-only queries when possible. However, at this time, apparently the RecordNeeds variations aren't all implemented, and still require too much knowledge on the callers' part. See the related tickets above.


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