[SPARK-3598][SQL]cast to timestamp should be the same as hive

this patch fixes timestamp smaller than 0 and cast int as timestamp

select cast(1000 as timestamp) from src limit 1;

should return 1970-01-01 00:00:01, but we now take it as 1000 seconds.
also, current implementation has bug when the time is before 1970-01-01 00:00:00.
rxin marmbrus chenghao-intel

Author: Daoyuan Wang <daoyuan.wang@intel.com>

Closes #2458 from adrian-wang/timestamp and squashes the following commits:

4274b1d [Daoyuan Wang] set test not related to timezone
1234f66 [Daoyuan Wang] fix timestamp smaller than 0 and cast int as timestamp
[SPARK-3582][SQL] not limit argument type for hive simple udf

Since we have moved to `ConventionHelper`, it is quite easy to avoid call `javaClassToDataType` in hive simple udf. This will solve SPARK-3582.

Author: Daoyuan Wang <daoyuan.wang@intel.com>

Closes #2506 from adrian-wang/spark3582 and squashes the following commits:

450c28e [Daoyuan Wang] not limit argument type for hive simple udf
[SPARK-3536][SQL] SELECT on empty parquet table throws exception

It returns null metadata from parquet if querying on empty parquet file while calculating splits.So added null check and returns the empty splits.

Author : ravipesala ravindra.pesalahuawei.com

Author: ravipesala <ravindra.pesala@huawei.com>

Closes #2456 from ravipesala/SPARK-3536 and squashes the following commits:

1e81a50 [ravipesala] Fixed the issue when querying on empty parquet file.