Github user bavardage commented on the issue:
https://github.com/apache/spark/pull/21794
There is a way in which the `nanSafeCompare*` methods do differ from java
built-in, but that wasn't captured in the test cases (or in the suggestive
naming of the method), namely the handling of `-0.0` vs `0.0`.
`java.lang.Double.compare(-0.0d, 0.0d) == -1`
`Utils.nanSafeCompareDoubles(-0.0d, 0.0d) == 0`
If that behaviour is indeed required, I could abandon this PR and instead
fix the test cases to capture this.
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