yuanfeng0905 opened a new issue #4130:
URL: https://github.com/apache/incubator-doris/issues/4130
example sql:
```sql
select a,from_base64(a)
from (
select "aGVsbG8=" a
union all
select null a
) t
```
The expect result is:
| a | from_base64(`a`) |
| - | - |
| aGVsbG8= | hello |
| | |
But now the result is:
| a | from_base64(`a`) |
| - | - |
| aGVsbG8= | hello |
| | hello |
**Doris version: 0.11.25 (baidu-doris/incubator-doris)**
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