FA-99529 / Vector retrieval ranking / Member archive
Vector retrieval: Duplicate IDs keep the first shard score · case 04
Duplicate IDs keep the first shard score.
Case contract
Across shards, repeated IDs retain their maximum score before global ranking.
Why this case matters
An offline vector retrieval toy model isolates one ranking contract from embedding generation, storage, and serving.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| later better | ["b", "a"] | ["a", "b"] | Failed |
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