[BUG] parse failed in a joint index of multiple fields in mysql dialect

[hubertshelley]

CREATE TABLE `data` (
  `id` bigint NOT NULL AUTO_INCREMENT,
  `bind_id` varchar(36) COLLATE utf8mb4_general_ci NOT NULL,
  `json` json NOT NULL,
  `source_key` varchar(128) COLLATE utf8mb4_general_ci NOT NULL,
  `is_synced` tinyint(1) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `bind_id_source_key_ids` (`bind_id`,`source_key`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci

sql parser error: Expected ',' or ')' after column definition, found: USING at Line: 8, Column 64