on condition lower_case_table_names =1, error caused by schema_name case sensitive

[yexiaoli88]

• dble version:5.6.29-dble-9.9.9.9-0b5816d-20181016014338
• preconditions ：
  no
• configs：

schema.xml

<schema name="DBTEST">
            <table name="Test_Table" dataNode="dn1,dn2,dn3,dn4" rule="hash-four" />
 </schema>
<schema dataNode="dn5" name="mytest" sqlMaxLimit="100">
	<table dataNode="dn1,dn2,dn3,dn4" name="test" type="global" />
</schema>

server.xml

  <user name="root">
        <property name="password">111111</property>
        <property name="manager">true</property>
      </user>
      <user name="test">
        <property name="password">111111</property>
        <property name="schemas">mytest, DbTest</property>
      </user>

• steps：
  step1. vim my.cnf on backend msyql ,set lower_case_table_names = 1 ,restart ,mysql
  step2: restart dble
  step 3: query in dble

mysql> show databases;
+----------+
| DATABASE |
+----------+
| dbtest   |
| mytest   |

mysql> use mytest;

mysql> select t1.id from dbtest.Test_Table t1,test t2 where t1.id=t2.id and t1.id = 1;
Empty set (0.01 sec)

mysql> select t1.id from DbTest.Test_Table t1,test t2 where t1.id=t2.id and t1.id = 1;
ERROR 1146 (42S02): Table `DbTest`.`Test_Table` doesn't exist

mysql> explain select t1.id from DbTest.Test_Table t1,test t2 where t1.id=t2.id and t1.id = 1;
ERROR 1146 (HY000): Table `DbTest`.`Test_Table` doesn't exist

• expect result：
  1. schema name should case insensitive
• real result：
  1. schema name should case sensitive
• supplements：
  1. autotest position:
     features/cfg_test/lower_case_table_names.ffeature

/label ~BUG

[yexiaoli88]

verified on version: 5.6.29-dble-9.9.9.9-359645c-20181029082136