[SERVER-85710] Make stage builder's buildUnwind compatible with block processing Created: 25/Jan/24  Updated: 02/Feb/24

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

Type: Task Priority: Major - P3
Reporter: Alberto Massari Assignee: Foteini Alvanaki
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Query Execution
Sprint: QE 2024-02-05, QE 2024-02-19
Participants:

 Description   

The idea is to have a $match that can be vectorized, followed by a $addFields that creates an array using scalar processing, followed by an $unwind that works on that scalar array, followed by another stage that can be vectorized (a $match that compares a block variables with the scalar value generated by the $addFields). The purpose of the change would be to let the $unwind propagate the "can produce vectorized" flag down to the child stage, then create the scalar operation and don't insert the final block_to_row


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