morningman opened a new issue #4785:
URL: https://github.com/apache/incubator-doris/issues/4785
**Describe the bug**
Doris:
```
mysql> select dayofweek("10:00:00");
+-----------------------+
| dayofweek('10:00:00') |
+-----------------------+
| 2 |
+-----------------------+
1 row in set (0.06 sec)
```
MySQL:
```
mysql> select dayofweek("10:00:00");
+-----------------------+
| dayofweek("10:00:00") |
+-----------------------+
| NULL |
+-----------------------+
1 row in set, 1 warning (0.05 sec)
```
**Why**
This is because "10:00:00" is converted to "2020-00-00", both in Doris and
MySQL.
but `dayofweek("2020-00-00")` results in `NULL` in MySQL.
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