Index column size too large. The maximum column size is 767 bytes
原因如下：https://izhong.me/index.php/archives/125/
解決辦法如下
1、set global innodb_large_prefix=on; (該參數可以在/etc/my.cnf中配置)
2、set global variable innodb_file_format=BARRACUDA;
3、使用 Innodb引擎在建表語句後加入ROW_FORMAT=DYNAMIC (例如語句最後加上:ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci COMMENT='日誌表' ROW_FORMAT=DYNAMIC ;)