Github user davies commented on the pull request:
https://github.com/apache/spark/pull/8375#issuecomment-202458325
@saurfang This could be done easily with DataFrame APIs:
```
val df = rdd.map(t => Row(gen_key(t), t)).toDF("key", "text")
df.write.partitionBy("key").text(path)
```
DataFrame APIs also support many other data type and file formats.
Would you mind close this PR and put this workaround in the JIRA?
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