Github user marmbrus commented on the issue:
https://github.com/apache/spark/pull/10162
Thanks for working on this! Sorry for letting this PR go stale. While I
think this could be a good feature, I'm worried that as its implemented it
would be a breaking change (since we are renaming columns). It also seems like
its broken some python tests?
Perhaps it would be best to go back to JIRA and agree on the API. In
pandas for example, I think you might need to explicitly ask for a prefix.
As a minor note, there are also a few style issues. The [style
guide](https://cwiki.apache.org/confluence/display/SPARK/Spark+Code+Style+Guide)
talks more about our rules for indenting, etc.
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