Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/23052
There are two more things to deal with:
https://github.com/apache/spark/pull/23052#issuecomment-440687200 comment
will still be valid - at least it should be double checked because dataframes
originated from emptyRDD does not write anything all times.
One thing is CSV for text-based datasources because it can write out
headers. Thing is, the header is currently written when the first row is
written - this is what https://github.com/apache/spark/pull/13252 PR targeted
before. I closed this because there's no interests but we should fix.
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