Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/10034#issuecomment-160746149
I considered about changing it that way but thought that would break
everyone who had gotten it to work with a comma-separated string.
Also spark-submit (pyspark, spark-shell, spark-submit, sparkR CLIs) is
expecting a comma-separated string - it might make more sense for someone who
is more familiar with that.
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