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Type: Bug
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 8.3.0-rc0
Affects Version/s: None
Component/s: None
Labels:
None

Assigned Teams:

Query Execution
Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Sprint:
QE 2026-01-05, QE 2025-12-22
CAR Domain/s:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

Consider the repro.js
The $merge aggregation should use collation and find the matching document, but it doesn't.

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repro.js
0.6 kB
Dec 19 2025 02:29:03 PM UTC

related to

SERVER-115810 When $merge "on" field uses default value, it doesn't respect collation

In Progress

SERVER-109034 $merge execution uses update when insert may be more efficient

Closed

Assignee:: Ivan Fefer
Reporter:: Ivan Fefer
Participants:: Githook User, Ivan Fefer
Votes:: 0 Vote for this issue
Watchers:: 2 Start watching this issue

Created:: Dec 19 2025 02:16:29 PM UTC
Updated:: Dec 23 2025 09:48:30 AM UTC
Resolved:: Dec 23 2025 09:42:18 AM UTC