Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18111
OK. LGTM. I think this anyway should issue warnings:
```
WARN org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter: Output
Path is null in setupJob()
WARN org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter: Output
Path is null in commitJob()
```
and I assume we prefer working permissively rather than failing fast. At
least, it looks that's what `FileOutputCommitter` allows even if it skips
moving the output.
Please make a followup if I misunderstood and anything is wrong. Will merge
this one in few days.
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