一般来讲，中文注释乱码问题是字符集导致的。
1.进入hive元数据库,查看字符集
(1)mysql uroot -pmysql123
(2)use hive;
(3)查看：
show variables like '%char%';
+--------------------------+-------------------------------------+
| Variable_name | Value |
+--------------------------+-------------------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /opt/beh/core/mysql/share/charsets/ |
+--------------------------+-------------------------------------+
show variables like '%colla%';
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database | utf8_general_ci |
| collation_server | utf8_general_ci |
+----------------------+-----------------+
2.修改字符集
(1)mysql下修改：
alter database hive default character set utf8;
ALTER DATABASE DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
ALTER TABLE columns_v2 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
ALTER TABLE columns_v2 CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
(2)修改配置文件/etc/my.cnf
vim /etc/my.conf
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8
[mysqld]
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8
其他解决方案：
字符集问题 可进元数据库
刷：
alter table COLUMNS_V2 modify column COMMENT varchar(256) character set utf8;
alter table TABLE_PARAMS modify column PARAM_VALUE varchar(4000) character set utf8;
alter table PARTITION_PARAMS modify column PARAM_VALUE varchar(4000) character set utf8;
alter table PARTITION_KEYS modify column PKEY_COMMENT varchar(4000) character set utf8;
alter table INDEX_PARAMS modify column PARAM_VALUE varchar(4000) character set utf8;
