Github user rxin commented on the issue:
https://github.com/apache/spark/pull/21192
eh I actually think separated makes it much simpler to look at, compared
with an array. Why complicate the API and require users to understand how to
specify an array (in all languages)?
One question I have is whether we'd want to support multiple separators and
each separator can be multi sequence chars as well. In that case an array might
make more sense to specify the multi separators, and each separator is just
space delimited for chars.
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