[SERVER-66815] Further refine the set of queries which are considered eligible for SBE Created: 26/May/22  Updated: 06/Dec/22  Resolved: 21/Sep/22

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

Type: Task Priority: Major - P3
Reporter: David Storch Assignee: Backlog - Query Execution
Resolution: Won't Do Votes: 0
Labels: pm2697-m4
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Query Execution
Participants:

 Description   

The goal would be to further mitigate risk of performance regression. We would need to settle on exactly what behavior we intend to implement. Ideas proposed thus far include:

  • Fall back to classic if there are more than n accumulators in a pushed down $group.
  • Fall back to classic if there is a match expression exceeding some complexity threshold. For instance, we could count the number of nodes in the tree and fallback if there are too many.

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