924060929 opened a new issue #5440:
URL: https://github.com/apache/incubator-doris/issues/5440
**Describe the bug**
Execute follow sql, and expect response '', but response others
```sql
select bitmap_to_string(bitmap_not(bitmap_from_string('1'),
bitmap_from_string('1,2')));
```
This is beause there's something wrong with the code

We should modify to

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**Expected behavior**
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