[SERVER-2538] MR: shouldn't create _id index in temp collection for merge or reduce output styles Created: 11/Feb/11  Updated: 06/Dec/22  Resolved: 09/Mar/20

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

Type: Bug Priority: Major - P3
Reporter: Mathias Stearn Assignee: Backlog - Query Team (Inactive)
Resolution: Done Votes: 1
Labels: query-44-grooming
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Related
Assigned Teams:
Query
Operating System: ALL
Participants:

 Comments   
Comment by Charlie Swanson [ 09/Mar/20 ]

In a recent project we reimplemented mapReduce on top of the aggregation framework. In particular, these output modes now use $merge, which doesn't involve any temporary collections.

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