Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19497
@mridulm, BTW, WDYT about disallowing:
```
.saveAsNewAPIHadoopFile[...]("")
.saveAsNewAPIHadoopFile[...]("::invalid:::")
```
within the APIs? If i tested this correctly, this PR also allows both cases
but I think we should disallow as it requires `path` and overrides it and
`saveAsHadoopFile` disallows it. Seems this is also allowed in branch-2.1 as I
recall correctly but looks disallowing it sounds more making sense in any event.
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