sergiimk opened a new issue, #8790:
URL: https://github.com/apache/arrow-datafusion/issues/8790
### Describe the bug
The `coalesce()` function when applied to two `Timestamp(_, _)` columns
unexpectedly returns `Utf8` result.
### To Reproduce
In `datafusion-cli`:
```
create or replace table x as (
select
cast(null as timestamp) as n,
cast('2020-01-01T00:00:00Z' as timestamp) as v
);
describe x;
+-------------+-----------------------------+-------------+
| column_name | data_type | is_nullable |
+-------------+-----------------------------+-------------+
| n | Timestamp(Nanosecond, None) | YES |
| v | Timestamp(Nanosecond, None) | NO |
+-------------+-----------------------------+-------------+
select * from x;
+---+---------------------+
| n | v |
+---+---------------------+
| | 2020-01-01T00:00:00 |
+---+---------------------+
create or replace table y as (
select coalesce(n, v) as v from x
);
select * from y;
+---------------------+
| v |
+---------------------+
| 2020-01-01T00:00:00 |
+---------------------+
describe y;
+-------------+-----------+-------------+
| column_name | data_type | is_nullable |
+-------------+-----------+-------------+
| v | Utf8 | YES |
+-------------+-----------+-------------+
```
### Expected behavior
1) Result column is of `Timestamp` type
2) Result column is NOT nullable, as one of the arguments to `coalesce()`
cannot be NULL
### Additional context
_No response_
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