Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/12493#issuecomment-215280314
I think the best workaround is to do something like
```
oldOpt <- getOption("stringsAsFactors")
options(stringsAsFactors=FALSE)
do.call(rbind.data.frame(data))
options(stringsAsFactors=oldOpt)
```
i.e. set the global option before calling rbind and then reset it to the
previous value
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