[SERVER-58957] $match stage with $expr does not always need to make a 'MatchExpression' Created: 29/Jul/21  Updated: 06/Dec/22

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

Type: Improvement Priority: Major - P3
Reporter: Arun Banala Assignee: Backlog - Query Execution
Resolution: Unresolved Votes: 0
Labels: neweng
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Query Execution
Sprint: QE 2021-11-15, QE 2021-11-29, QE 2021-12-27, QE 2022-01-10, QE 2022-04-04, QE 2022-02-07, QE 2022-02-21, QE 2022-03-07, QE 2022-03-21, QE 2022-01-24
Participants:

 Description   

If a $match (with $expr) stage isn't a source stage after the rewrite, we could avoid building a 'MatchExpression' for the query inside the $match and directly evaluate the aggregate expression inside DocumentSourceMatch stage itself. The main advantage of doing this is that we avoid unnecessary transformation of Document -> BSONObj -> Document, that happens in DocumentSourceMatch stage for each document.


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