[SERVER-71940] Support visiting nested pipelines in DocumentSourceWalker Created: 07/Dec/22  Updated: 08/Dec/22

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

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

Issue Links:
Related
is related to SERVER-71941 Support in and post-visitors in the D... Backlog
Assigned Teams:
Query Optimization
Participants:

 Description   

DocumentSourceWalker currently iterates over all Document Sources in the top-level pipeline. This is currently sufficient for ABT translation which is the only user of DocumentSourceWalker. The ability to visit all stages in sub-pipelines (like $unionWith or $lookup) could be a nice to have for future use-cases.


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