FA-45702 / Data systems / Member archive
Top-k retractions carry updated scores instead of old scores · case 02
Top-k retractions carry updated scores instead of old scores.
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, null, -1], [2, 4, 1]] | [[1, 5, -1], [2, 4, 1]] | Failed |
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