Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/7419#issuecomment-131324275
@shivaram , as you pointed out, I come with a simpler fix. I realized that
simply creating an empty vector using vector() without mode is OK when there is
no row in columns. Because vector() creates a zero-length vector of type
"logical", and "logical" is of virutally lowest precedence in the R's type
hierarchy, so it is supposed that "logical" type won't affect later coercion in
operations on a data.frame of 0 row, for example, rbind().
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