sharding value is an hextype,dble will report error or route to wrong node

[yanhuqing666]

• **dble version：any version,use develop version as example **
• preconditions ：
  You must konw，In MySQL

mysql> SELECT x'4D7953514
+---------------+
| x'4D7953514C' |
+---------------+
| MySQL         |
+---------------+
1 row in set (0.12 sec)

• configs：

sharding.xml

<schema name="testdb" >
<shardingTable name="tb_jump_hash" shardingNode="dn1,dn2" function="func_jumpHash" shardingColumn="code"/>
</schema>

<!-- jumpStringHash partition for string-->
<function name="func_jumpHash" class="jumpStringHash">
	<property name="partitionCount">2</property>
	<property name="hashSlice">0:2</property>
</function>

• steps：
  step1.

drop table if exists tb_jump_hash;
create table if not exists tb_jump_hash (
  id int not null,
  code varchar(250) not null,
  content varchar(250) not null,
  primary key(id)
)engine=innodb charset=utf8;

step2.

insert into tb_jump_hash values (12,x'4D7953514C','MySQL');

step3.

insert into tb_jump_hash values (13,'MySQL','MySQL');

• expect result：
  1.step2 success and route to current node
• real result：
  1.ERROR 1064 (HY000): Not Supported of Sharding Value EXPR :0x4D7953514C
• supplements：
  1.