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docs: report the current differential sweep coverage #57

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Aybavs merged 1 commit into from
Aug 4, 2026
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docs: report the current differential sweep coverage #57

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9 changes: 5 additions & 4 deletions README.md
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Expand Up @@ -175,10 +175,11 @@ go test ./internal/difftest/ -run Differential -seed 31337 -queries 5000
```

Every failure prints the exact query and seed. The engine has been checked
across seeds 1, 2, 3, 99, 777, 12345, and 31337 at 5,000 queries each — 35,000
comparisons with no disagreements. Roughly a quarter of the generated queries
are joins, so the hash join is genuinely covered rather than incidentally
touched.
across ten seeds at 5,000 queries each — 50,000 comparisons with no
disagreements, about 15,000 of them joins. That join share is asserted rather
than assumed: the runner fails if joins fall below a threshold, because an
earlier version of the generator only ever queried a single table, which left
the hash join — the most intricate operator here — outside the oracle entirely.

Comparison ignores row order, because SQL leaves it unspecified without
`ORDER BY`, but duplicate counts still have to match. `ORDER BY` correctness is
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