waitingkuo opened a new issue, #3149:
URL: https://github.com/apache/arrow-datafusion/issues/3149
**Describe the bug**
A clear and concise description of what the bug is.
**To Reproduce**
Steps to reproduce the behavior:
`now()` originally output `Timestamp(Nanosecond, Some("UTC"))`
```bash
❯ select arrow_typeof(now());
+------------------------------------+
| arrowtypeof(now()) |
+------------------------------------+
| Timestamp(Nanosecond, Some("UTC")) |
+------------------------------------+
1 row in set. Query took 0.002 seconds.
```
it becomes `Timestamp(NanoSecond, None)` after casting to `timestamp with
time zone`
```bash
❯ select arrow_typeof(now()::timestamp with time zone);
+---------------------------------------------------------+
| arrowtypeof(CAST(now() AS Timestamp(Nanosecond, None))) |
+---------------------------------------------------------+
| Timestamp(Nanosecond, None) |
+---------------------------------------------------------+
1 row in set. Query took 0.002 seconds.
```
**Expected behavior**
A clear and concise description of what you expected to happen.
should keep the timezone
**Additional context**
Add any other context about the problem here.
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