Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/8360#issuecomment-133523560
From what I can infer from the original JIRA is that we are trying to match
R data.frame behavior.
I think it is handy, though it is easy to think of several alternative ways
to do this (head(df), showDF(df)) but those will need to be learned.
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