[SERVER-60759] Eliminate mkbson stage when multiple $group stages are pushed down Created: 15/Oct/21  Updated: 29/Oct/23  Resolved: 21/Oct/21

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: 5.2.0

Type: Task Priority: Major - P3
Reporter: Yoon Soo Kim Assignee: Yoon Soo Kim
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Backwards Compatibility: Fully Compatible
Sprint: QE 2021-11-01
Participants:

 Description   

Eliminate PROJECT_SIMPLE for the following query solution tree.

GROUP - GROUP - PROJECTION_SIMPLE

This is a prerequisite to remove intermediate mkbson stage between GROUP and GROUP.

And then we can remove intermediate mkbson stage.



 Comments   
Comment by Yoon Soo Kim [ 15/Oct/21 ]

Draft PR: https://github.com/10gen/mongo/pull/1341

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