On Fri, Feb 16, 2018 at 9:44 AM, Zoltan Borok-Nagy <borokna...@cloudera.com> wrote: > I would just like to mention that the fmax() / fmin() functions in C/C++ > Math library follow the aforementioned IEEE 754-2008 min and max > specification: > http://en.cppreference.com/w/c/numeric/math/fmax > > I think this behavior is also the most intuitive and useful regarding to > statistics. If we want to select the max value, I think it's reasonable to > ignore nulls and not-numbers.
It should be noted that this is different than the total ordering predicate. With that predicate, -NaN < -inf < negative numbers < -0.0 < +0.0 < positive numbers < +inf < +NaN fmax appears to be closest to IEEE-754's maxNum, but not quite matching for some corner cases (-0.0, signalling NaN), but I'm not 100% sure on that.
