For global table, in select ...where... syntax, now not support "schema.table.column" in where clause

[wjl1619]

• dble version：
  5.6.29-dble-9.9.9.9-b83955577d2f5f3555ac6f1254e9c5edb69cefb4-20190129042006
• preconditions ：

drop table if exists test1;
drop table if exists schema3.test3;
CREATE TABLE test1(`id` int(10) unsigned NOT NULL,`t_id` int(10) unsigned NOT NULL DEFAULT '0',`name` char(120) NOT NULL DEFAULT '',`pad` int(11) NOT NULL,PRIMARY KEY (`id`),KEY `k_1` (`t_id`))DEFAULT CHARSET=UTF8;
CREATE TABLE schema3.test3(`id` int(10) unsigned NOT NULL,`m_id` int(10) unsigned NOT NULL DEFAULT '0',`name` char(120) NOT NULL DEFAULT '',`pad` int(11) NOT NULL,PRIMARY KEY (`id`),KEY `k_1` (`m_id`))DEFAULT CHARSET=UTF8;

• configs：

schema.xml

<schema name="schema1" sqlMaxLimit="100">
		<table name="global_4_t1" dataNode="dn1,dn2,dn3,dn4" type="global" />
		<table name="test1" dataNode="dn1,dn2,dn3,dn4" type="global" />
	</schema>
<schema name="schema3" sqlMaxLimit="100" dataNode="dn5">
		<table name="test3" dataNode="dn1,dn2,dn3,dn4" type="global" />
	</schema>

server.xml

<user name="test">
		<property name="password">111111</property>
		<property name="schemas">schema1,schema2,schema3</property>
	</user>

• steps：
  step1. execute the sql:

select schema3.test3.id,schema3.test3.pad from test1 join schema3.test3 where test1.pad=schema3.test3.pad;

• expect result：
  1.execute correctly and return right result

• real result：
  mysql> select schema3.test3.id,schema3.test3.pad from test1 join schema3.test3 where test1.pad=schema3.test3.pad;
  ERROR 1003 (HY000): Unknown column 'schema3.test3.pad' in 'where clause'
  mysql> explain select schema3.test3.id,schema3.test3.pad from test1 join schema3.test3 where test1.pad=schema3.test3.pad;
  +-----------+----------+---------------------------------------------------------------------------------------------------+
  | DATA_NODE | TYPE | SQL/REF |
  +-----------+----------+---------------------------------------------------------------------------------------------------+
  | dn1_0 | BASE SQL | select test3.id,test3.pad from test1 join test3 where test1.pad = schema3.test3.pad |
  | merge_1 | MERGE | dn1_0 |
  +-----------+----------+---------------------------------------------------------------------------------------------------+

• supplements：
  1.

/label ~BUG
located in auto_test: dble/features/sql_cover/special/sql_global.feature, dble/sqls/special_global/select/join.sql (line 17)

[FlyingMao]

#965

[wjl1619]

verified on version: 5.6.29-dble-9.9.9.9-2c240dda40d1ed03c20d5c8415c5916c88f53491-20190215032215