HappenLee edited a comment on issue #5447:
URL:
https://github.com/apache/incubator-doris/issues/5447#issuecomment-794960744
Hi, @francisoliverlee It's look like the problem of type cast. Before we fix
the problem, you can use the sql like
```
select
distinct teacher_region
from
(
select
cast (teacher_region as varcher) as teacher_region
from
test.dp_class_student_test
union all
select
'全国' as teacher_region
from
test.dp_class_student_test
) as aaa
where teacher_region in ('1', '全国')
```
to avoid the problem appear.
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