Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20666
That's not related to this change. The issue itself seems to be a behaviour
change between 1.6 and 2.x for treating empty string as null or not in double
and float, which is rather a corner case and which looks, yea, an issue. Let me
try to fix it while I'm here.
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