[SERVER-48119] Support cross-database $unionWith Created: 12/May/20  Updated: 06/Dec/22

Status: Backlog
Project: Core Server
Component/s: Aggregation Framework, Performance
Affects Version/s: 4.4.0
Fix Version/s: None

Type: Improvement Priority: Major - P3
Reporter: Charlie Swanson Assignee: Backlog - Query Optimization
Resolution: Unresolved Votes: 4
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Query Optimization
Participants:

 Description   

Add support to union with the results of a collection in another database. Syntax could be something like

{$unionWith: {
   coll: "collection name",
   db: "db name",
   pipeline: []
}}


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