Streams records (sync or async iterable), accumulating the column corpus + uniqueness/null stats until exhaustion or the time budget. Read-only; the caller supplies whatever read-only fetch yields the records (no save, no ack happens here).
Streams records (sync or async iterable), accumulating the column corpus + uniqueness/null stats until exhaustion or the time budget. Read-only; the caller supplies whatever read-only fetch yields the records (no save, no ack happens here).