Failing test case.

t/lib/samples/cardinality.sql

@@ -0,0 +1,49 @@
+DROP DATABASE IF EXISTS cardb;
+CREATE DATABASE cardb;
+USE cardb;
+CREATE TABLE t (
+  high  INT UNSIGNED NOT NULL,
+  low   INT UNSIGNED NOT NULL,
+  INDEX a (low),
+  INDEX b (high),
+  INDEX c (low)
+) ENGINE=InnoDB;
+INSERT INTO t VALUES
+  (1,   1),
+  (2,   1),
+  (3,   1),
+  (4,   1),
+  (5,   1),
+  (6,   1),
+  (7,   1),
+  (8,   1),
+  (9,   1),
+  (10,  1),
+  (11,  1),
+  (12,  1),
+  (13,  1),
+  (14,  1),
+  (15,  1),
+  (16,  1),
+  (17,  1),
+  (18,  1),
+  (19,  1),
+  (20,  1),
+  (21,  2),
+  (22,  2),
+  (23,  2),
+  (24,  2),
+  (25,  2),
+  (26,  2),
+  (27,  2),
+  (28,  2),
+  (29,  2),
+  (30,  2),
+  (31,  2),
+  (32,  2),
+  (33,  2),
+  (34,  2),
+  (35,  2),
+  (36,  2),
+  (37,  2);
+ANALYZE TABLE t;