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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2022/10/06 09:03:36 UTC
[GitHub] [doris] lsy3993 opened a new issue, #13131: [Enhancement] Add new builtin function of the first day of month
lsy3993 opened a new issue, #13131:
URL: https://github.com/apache/doris/issues/13131
### Search before asking
- [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.
### Description
Add a new builtin function named **first_month_day**, the mechanism of this function is the same as **toStartOfMonth** in ClickHouse.
### Syntax
first_month_day(datetime)
### Arguments
**datetime** — This argument's type could be date, datetime, datev2 or datetimev2
### Returned values
This function return **date** when argument is date or datetime; return **datev2** when argument is datev2 or datetimev2.
And this function always returns the month first day, so the output day is always '01'.
Input **('2021-12-01')**, it returns **('2021-12-01')**; or Input **('2021-12-31')**, it still returns **('2021-12-01')**
### Solution
_No response_
### Are you willing to submit PR?
- [X] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)
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[GitHub] [doris] nextdreamblue commented on issue #13131: [Enhancement] Add new builtin function of the first day of month
Posted by GitBox <gi...@apache.org>.
nextdreamblue commented on issue #13131:
URL: https://github.com/apache/doris/issues/13131#issuecomment-1272446544
MySQL [(none)]> select month_floor('2021-12-22 01:02:03');
+------------------------------------+
| month_floor('2021-12-22 01:02:03') |
+------------------------------------+
| 2021-12-01 00:00:00 |
+------------------------------------+
1 row in set (0.01 sec)
MySQL [(none)]> select date_format(month_floor('2021-12-22 01:02:03'),'yyyy-MM-dd');
+-------------------------------------------------------------+
| date_format(month_floor('2021-12-22 01:02:03'), '%Y-%m-%d') |
+-------------------------------------------------------------+
| 2021-12-01 |
+-------------------------------------------------------------+
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