[SERVER-71554] Follow up pipeline golden tests with overridden Cost Model Created: 22/Nov/22  Updated: 05/Dec/22

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

Type: Task Priority: Major - P3
Reporter: Alexander Ignatyev Assignee: Backlog - Query Optimization
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Query Optimization
Participants:

 Description   

The new Cost Model introduces ABT nodes startup costs and makes IndexScan plans relatively more expansive then PhysicalScan on smaller collections. It laso makes index intersection plans with HashJoin and MergeJoin more expensive comparing to plain IndexScan plans which sometimes make IndexScan plan more preferable over index intersection plans.

As a result, we use old Cost Model in the pipeline golden tests to guarantee that the generated plans are the same.

This ticket is created to keep track of the override and consider possibility of changing the tests to use the new model at some moment.


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