{d,f,m} | {"3, 4": 2550, "3, 6": 800, "4, 6": 1632, "3, 4, 6": 5000}
(1 row)
--- correct esimates
+-- correct estimates
SELECT * FROM check_estimated_rows('SELECT COUNT(*) FROM ndistinct GROUP BY a, b');
estimated | actual
-----------+--------
WHERE s.stxrelid = 'ndistinct'::regclass
AND d.stxoid = s.oid;
--- correct esimates
+-- correct estimates
SELECT * FROM check_estimated_rows('SELECT COUNT(*) FROM ndistinct GROUP BY a, b');
SELECT * FROM check_estimated_rows('SELECT COUNT(*) FROM ndistinct GROUP BY a, b, c');