Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/23043
Before rushing to a fix that replaces -0.0 to 0.0, I'd like to know how
this bug happens.
One possible reason might be, 0.0 and -0.0 have different binary format.
Spark use unsafe API to write float/double, maybe we can investigate that first.
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