Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/990#issuecomment-45465573
Thank you for your comments.
I added some tests.--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
