Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/12493#issuecomment-215208501
@sun-rui I poked around this a little bit more today. It looks like what is
happening is that somehow we are creating `factor` type objects when we have
strings in our dataframe. I think the problem is in the line
`data <- do.call(rbind.data.frame, c(data, stringsAsFactors = FALSE))` in
worker.R -- I am not sure the `stringsAsFactors = F` is being passed correctly.
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