Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/11811#issuecomment-199077749
R's signature is
```
as.data.frame(x, row.names = NULL, optional = FALSE, ...)
```
But current implementation does not support the parameters like row.names,
optional:
```
if (length(list(...)) > 0) {
stop(paste("Unused argument(s): ", paste(list(...), collapse
= ", ")))
}
```
This PR enhance the implementation so that the additional parameters can be
honored. This should match R users's usage more.
Also in this PR the as.data.frame versions in the R base package can also
be expose and used.
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