Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15231
@felixcheung Yeap, I just added. As we don't currently have an internal
datasource allowing `DataFrameWriter.save()` without a path, I just added a
test with CSV data source to make sure it throws an exception from Spark side
(not from SparkR).
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