gistfile1.txt

CREATE TABLE `gmf_commentmeta` (
  `meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, 
  `comment_id` bigint(20) unsigned NOT NULL, 
  `meta_key` varchar(600) DEFAULT NULL, 
  `meta_value` longtext DEFAULT NULL, 
PRIMARY KEY `PRIMARY` (`meta_id`) USING BTREE,
KEY `comment_id` (`comment_id`) USING BTREE,
KEY `meta_key` (`meta_key`) USING BTREE
) ENGINE=InnoDB ROW_FORMAT = COMPACT
MySQL said: Documentation

#1709 - Index column size too large. The maximum column size is 767 bytes.