Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19443
This might look okay within Python side because the fix looks minimised and
does not actually increase complexity much; however, I think we focus on API
consistency between other languages in general. In this sense, I think we tend
to avoid adding those with string parameters in Scala side, please see
https://github.com/apache/spark/pull/18144#issuecomment-304960488,
https://github.com/apache/spark/pull/18144#issuecomment-304926567 and
https://github.com/apache/spark/pull/18144#issuecomment-304955155. I am -0 on
this because the workaround is simple anyway.
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