select from多个设备时，返回结果有多个完全一样的列

[davy0118]

初始化数据如下:
insert into root.ln.wf01.wt01(timestamp,temp1)values(0,21);
insert into root.ln.wf01.wt01(timestamp,temp1)values(3600000,22);
insert into root.ln.wf01.wt01(timestamp,temp2)values(0,23);
insert into root.ln.wf01.wt01(timestamp,temp2)values(3600000,24);

insert into root.ln.wf01.wt02(timestamp,temp1)values(0,25);
insert into root.ln.wf01.wt02(timestamp,temp1)values(3600000,26);
insert into root.ln.wf01.wt02(timestamp,temp2)values(0,27);
insert into root.ln.wf01.wt02(timestamp,temp2)values(3600000,28);

insert into root.ln.wf01.wt03(timestamp,temp1)values(0,29);
insert into root.ln.wf01.wt03(timestamp,temp1)values(3600000,30);
insert into root.ln.wf01.wt03(timestamp,temp2)values(0,31);
insert into root.ln.wf01.wt03(timestamp,temp2)values(3600000,32);

查询sql:
select avg(temp1) from root.ln.wf01.wt03, root.ln.wf01.wt01 group by ([1970-01-01T08:00:00,1970-01-01T10:00:00),1h),level=2

结果错误：
+-------------------------------+------------------------+------------------------+
| Time |avg(root..wf01..temp1)|avg(root..wf01..temp1)|
+-------------------------------+------------------------+------------------------+
|1970-01-01T08:00:00.000+08:00 | 25.0 | 25.0 |
|1970-01-01T09:00:00.000+08:00 | 26.0 | 26.0 |
+-------------------------------+------------------------+------------------------+

因为产生了两列完全相同的结果

但是如果我用sql：
select avg(temp1) from root.ln.wf01.* group by ([1970-01-01T08:00:00,1970-01-01T10:00:00),1h),level=2

结果就是正确的
+-----------------------------+------------------------+
| Time |avg(root..wf01..temp1) |
+-----------------------------+------------------------+
|1970-01-01T08:00:00.000+08:00| 25.0 |
|1970-01-01T09:00:00.000+08:00| 26.0 |
+-----------------------------+------------------------+

我的应用场景是：我有多个设备，但是我需要对其中部分设备进行汇总，所以不能用通配符来实现，应该如何做到呢？