[GitHub] [incubator-doris] HappenLee edited a comment on issue #5447: [Bug][union all same field with different types make EXCEPTION] Unexpected exception: Failed analysis after expr substitution.

[GitBox <gi...@apache.org>]

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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