[SERVER-72934] Avoid creating a metadata merging pipeline for search queries which do not reference $$SEARCH_META Created: 17/Jan/23  Updated: 29/Oct/23  Resolved: 04/Apr/23

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: 7.0.0-rc0

Type: Improvement Priority: Major - P3
Reporter: Nicholas Zolnierz Assignee: Alyssa Clark
Resolution: Fixed Votes: 0
Labels: quick-tech-debt
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Query Integration
Backwards Compatibility: Fully Compatible
Sprint: QO 2023-03-06
Participants:

 Description   

Mongos currently unconditionally builds a metadata merging pipeline with a $setVariableFromSubPipeline stage, even if the tail of the pipeline has no reference to the search metadata ($$SEARCH_META). We can avoid this extra step by analyzing the dependencies of the pipeline suffix and do not build the extra stage if there's no reference to $$SEARCH_META.


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