Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/1528#issuecomment-49848091
This looks like a clean implementation, but you still need to open a JIRA
issue to explain why you want this; then edit the description of this PR to
reference that JIRA.
https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark#ContributingtoSpark-ContributingCode
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