goldmedal opened a new issue, #12602:
URL: https://github.com/apache/datafusion/issues/12602
### Is your feature request related to a problem or challenge?
Currently, date_trunc function only accepts `TIMESTAMP` and `TIMESTAMP WITH
TIME ZONE`
```
> select date_trunc('MONTH', TIMESTAMP '2011-02-12 12:09:08');
+-------------------------------------------------------+
| date_trunc(Utf8("MONTH"),Utf8("2011-02-12 12:09:08")) |
+-------------------------------------------------------+
| 2011-02-01T00:00:00 |
+-------------------------------------------------------+
1 row(s) fetched.
Elapsed 0.003 seconds.
> select date_trunc('MONTH', DATE '2011-02-12');
Error during planning: The date_trunc function can only accept timestamp as
the second arg.
> select date_trunc('MONTH', current_date());
Error during planning: The date_trunc function can only accept timestamp as
the second arg.
```
In other databases (e.g. DuckDB), `DATE` is also acceptable.
```
D select date_trunc('MONTH', DATE '2011-02-12');
┌─────────────────────────────────────────────────┐
│ date_trunc('MONTH', CAST('2011-02-12' AS DATE)) │
│ date │
├─────────────────────────────────────────────────┤
│ 2011-02-01 │
└─────────────────────────────────────────────────┘
D select date_trunc('MONTH', current_date());
┌─────────────────────────────────────┐
│ date_trunc('MONTH', current_date()) │
│ date │
├─────────────────────────────────────┤
│ 2024-09-01 │
└─────────────────────────────────────┘
```
I think it's reasonable to support `DATE` type in DataFusion.
### Describe the solution you'd like
Add `Date32` to the `return_type` match at `date_trunc.rs`
https://github.com/apache/datafusion/blob/6546479c862af9a31a50d36b700c0e4b485ef105/datafusion/functions/src/datetime/date_trunc.rs#L124-L135
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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