Github user davies commented on the pull request:
https://github.com/apache/spark/pull/9004#issuecomment-147598897
From Oracle:
https://docs.oracle.com/cd/B28359_01/server.111/b28286/functions004.htm
```
If date is the last day of the month or if the resulting month has fewer
days than the day component of date, then the result is the last day of the
resulting month.
```
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