alamb opened a new issue, #3980:
URL: https://github.com/apache/arrow-datafusion/issues/3980
**Describe the bug**
I would like to be able to find the current date, or the current day of
week, etc
DataFusion supports `now()` and `extract (hour from <timestamp>)` syntax ✅
However, you can't use `extract` with the value of `now()` 😢
**To Reproduce**
```
❯ select extract (day from now());
Plan("Coercion from [Utf8, Timestamp(Nanosecond, Some(\"UTC\"))] to the
signature OneOf([Exact([Utf8, Date32]), Exact([Utf8, Date64]), Exact([Utf8,
Timestamp(Second, None)]), Exact([Utf8, Timestamp(Microsecond, None)]),
Exact([Utf8, Timestamp(Millisecond, None)]), Exact([Utf8, Timestamp(Nanosecond,
None)])]) failed.")
```
**Expected behavior**
I expect the day part of `now()` to be extracted as in postgres:
```sql
postgres=# select extract(day from now());
extract
---------
27
(1 row)
```
Note that the error seems to be that DataFusion can't coerce a
`Timestamp(Nanosecond, "UTC")` to `Timestamp(Nanosecond, None)` -- aka it is
related to timezones
You can work around the problem by explicitly casting the output of `now()`
to timestamp (not timestamptz):
```sql
❯ select extract (day from cast(now() as timestamp));
+-----------------------------+
| datepart(Utf8("DAY"),now()) |
+-----------------------------+
| 27 |
+-----------------------------+
```
**Additional context**
This was reported by early (internal) users of IOx
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