FA-100269 / Dataset deduplication grouping / Member archive
Dataset deduplication: later duplicate replaces the first source record · case 04
later duplicate replaces the first source record.
Case contract
Rows are [key,id] in source order. Return representative IDs in first-key encounter order.
Why this case matters
This deterministic toy operation makes one dataset equivalence or representative rule explicit.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| later duplicate | ["later"] | ["first"] | Failed |
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