[SERVER-22966] Aggregation should use the output of DocumentSource::getOutputSorts() to optimize wherever possible. Created: 04/Mar/16  Updated: 06/Dec/22

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

Type: Improvement Priority: Major - P3
Reporter: Benjamin Murphy Assignee: Backlog - Query Optimization
Resolution: Unresolved Votes: 0
Labels: eng-s
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Query Optimization
Participants:

 Description   

As part of SERVER-4507, a virtual method was introduced on DocumentSource, getOutputSorts, that allows the following stage to determine what, if any, sorting is present on the stream of input documents. At the moment, only $group takes advantage of this knowledge. Where possible, other stages should be expanded to take advantage of it as well. Of course, the primary example is $sort, which can do far less work if the input is already sorted by the sort key, but other possibilities may exist as well.


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