qidaye commented on pull request #4612:
URL: https://github.com/apache/incubator-doris/pull/4612#issuecomment-692712619
`date_format()` behavior
```sql
mysql> select
date_format('20201300','%Y.%m.%d'),date_format('20200000','%Y.%m.%d');
+-------------------------------------+-------------------------------------+
| date_format('20201300', '%Y.%m.%d') | date_format('20200000', '%Y.%m.%d') |
+-------------------------------------+-------------------------------------+
| NULL | 2020.00.00 |
+-------------------------------------+-------------------------------------+
```
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