Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19673
Oh, the test and code looked not printing out. It actually does :) (newline
inserted for readability) :
```r
> write.df(createDataFrame(iris), path = "/tmp/foo", mode = "abc")
...
Error in mode : illegal argument - Unknown save mode: abc.
Accepted save modes are 'overwrite', 'append', 'ignore', 'error',
'errorifexists'.
```
Thank you for your review @felixcheung.
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