Github user davies commented on the issue:
https://github.com/apache/spark/pull/13652
@ckadner The test function here try to similar this SQL function:
cast(from_unix_timestamp(cast("2016-03-13 01:59:59" as timestamp), "PST")
as string)
In the beginning, I want to run all these tests in different timezone, but
unfortunately some of them could not pass the tests, because of
```
* TODO: Because of DST, the conversion between UTC and human time is not
exactly one-to-one
* mapping, the conversion here may return wrong result, we should make
the timestamp
* timezone-aware.
```
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