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Assigned Teams:

Storage Execution
Backwards Compatibility:
Fully Compatible
Sprint:
Storage Execution 2026-09-28, Storage Execution 2026-10-12, Storage Execution 2026-10-26, Storage Execution 2026-11-09
Linked BF Score:
200
CAR Domain/s:
None

Consider a sparse index with key {"a.b": 1}. A document in that index's collection collection like

{a: [{c:1}]}

will be considered multikey even though it generates no keys for that index.

depends on

SERVER-136559 Allow non-multikey key generation to traverse arrays in sparse documents that generate no index keys

SERVER-138098 Exclude sparse indexes from collection-wide path arrayness inference

SERVER-138109 Skip multikey path-coverage validation for documents generating no index keys

SERVER-135300 Record multikey updates in their own side write entries

related to

SERVER-39705 IndexBuildInterceptor does not faithfully preserve multikey when a document generates no keys