Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/17956 @gatorsmile, @cloud-fan and @viirya, could you take another look please? I tried to get rid of all the behaviour changes existing in both previous PRs but only leave the change to avoid the conversion. I tried to generate combinations of the existing supports - https://github.com/apache/spark/pull/17956#issuecomment-301230679 and extracted three cases - "NaN", "-Infinity" and "Infinity" which I believe we have supported so far.
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