FA-45693 / Data systems / Member archive
Top-k maintenance drops a deleted row without backfilling from the full relation · case 03
Top-k maintenance drops a deleted row without backfilling from the full relation.
Case contract
Maintain unique-ID scored rows with upsert/delete operations, then report changes to a top-k materialized view. Scores order descending with ascending ID ties. Retractions carry old scores; insertions carry new scores. Score updates within the top-k emit both. Return retractions sorted by ID, then insertions sorted by ID.
Why this case matters
A bounded deterministic data engine model makes representation and changelog faults reproducible.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| delete leader | [[1, 6, -1]] | [[1, 6, -1], [2, 5, 1]] | Failed |
MEMBER ARCHIVE
The complete case is available to members.
This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
Member access is invitation-based. Sign in with your invited account to inspect the sources.
Sign in to the archive ↗