disable_index_merge_plans causes SELECT data loss when more than 100 ORs

CREATE TABLE `index_merge_test` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `uniq2` smallint(6) NOT NULL DEFAULT 0,

  PRIMARY KEY (`id`),

  KEY `uniq2` (`uniq2`)

) ENGINE=MyISAM;

INSERT INTO `index_merge_test` (`id`, `uniq2`) VALUES

	(1, 1),

	(2, 1),

	(3, 2);

SELECT id FROM index_merge_test WHERE

 -- (uniq2 = 2 AND id = 3) OR /* Try to uncomment this line. Expected number of results: 3. Returned number results: 1.  */

  (uniq2 = 1)

 OR (uniq2 = 1)

 OR (uniq2 = 1)

 OR (uniq2 = 1)

-- (repeat 100x)