Github user davies commented on the pull request:
https://github.com/apache/spark/pull/7353#issuecomment-121682853
In master, we can't cast `'238'` as timestamp,
```
spark-sql> select DATEDIFF(CAST(238 AS timestamp), CAST('2002-03-21
00:00:00' AS timestamp));
-11767
Time taken: 0.171 seconds, Fetched 1 row(s)
spark-sql> select DATEDIFF(CAST('238' AS timestamp), CAST('2002-03-21
00:00:00' AS timestamp));
NULL
Time taken: 0.1 seconds, Fetched 1 row(s)
```
I think you should check that the year is larger than `1000`.
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