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Dataset deduplication: hash collision merges distinct records · case 02
hash collision merges distinct records.
Case contract
Given rows [hash,key,id], return IDs of distinct full keys, retaining first occurrence order even when hashes collide.
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 |
|---|---|---|---|
| collision distinct keys | ["a"] | ["a", "b"] | Failed |
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