Github user ckadner commented on the pull request:
https://github.com/apache/spark/pull/6242#issuecomment-103670515
@srowen ...so far I have no luck with running ./dev/mima
@davies ...I propose to remove the test case _"Date comparison test 2"_
since the expression `"CAST(CAST(0 AS timestamp) AS date) > CAST(0 AS
timestamp)"` will produce different results based on the system timezone of the
machine running it,
i.e. it will evaluate to `true` in time zones east of GMT, i.e. Berlin,
Germany ...
```
"CAST(0 AS timestamp)" --> "1 Jan 1970 00:00:00 GMT"
"CAST(CAST(0 AS timestamp) AS date)" --> "1 Jan 1970 01:00:00 GMT"
```
... but to `false` west of GMT, i.e. San Francisco ...
```
"CAST(0 AS timestamp)" --> "1 Jan 1970 00:00:00 GMT"
"CAST(CAST(0 AS timestamp) AS date)" --> "31 Dec 1969 08:00:00 GMT"
```
Note, this conversion is only accurate down to the _day_ of the `Date`
object, since DateUtils uses full days to convert dates and the back-and-forth
timezone adjustment
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