Unsupported data type in hasher: Timestamp(Second, None)

[jychen7]

Describe the bug
Datafusion have 4 specific functions related to timestamp:

• to_timestamp (nano)
• to_timestamp_micros
• to_timestamp_millis
• to_timestamp_seconds

only to_timestamp_seconds is NOT supported in hasher, while other 3 are supported.

To Reproduce
use testing data

CREATE EXTERNAL TABLE x (
    c9  BIGINT NOT NULL
)
STORED AS CSV
WITH HEADER ROW
LOCATION '/testing/data/csv/aggregate_test_100.csv';

to_timestamp_millis works in group by

select to_timestamp_millis(c9 * 1000), count(1) from x
group by 1
limit 1;

to_timestamp_seconds raise error in group by

select to_timestamp_seconds(c9), count(1) from x
group by 1
limit 1;

Internal error: Unsupported data type in hasher: Timestamp(Second, None). This was likely caused by a bug in DataFusion's code and we would welcome that you file an bug report in our issue tracker

Expected behavior

select to_timestamp_seconds(c9), count(1) from x
group by 1
limit 1;

should return value

Additional context

[jychen7]

seems TimeUnit::Second is missing in following, will try to create a PR for it

https://github.com/apache/arrow-datafusion/blob/af8786ebea1d62f2f4f28f3eb390cc73fd3a9e16/datafusion/src/physical_plan/hash_utils.rs#L390-L419