FA-11863 / Search retrieval semantics / Member archive
Posting frequency is mistaken for document frequency · case 03
Posting frequency is mistaken for document frequency.
Case contract
Return the number of tokenized documents containing the query term, including documents with repeated occurrences exactly once.
Why this case matters
An offline deterministic retrieval model isolates this search contract from tokenization, storage, and network behavior.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| repeated document | 5 | 1 | Failed |
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