Github user JihongMA commented on the pull request:
https://github.com/apache/spark/pull/9705#issuecomment-157164943
@yhuai, so only when count = 1, stddev/stddev_samp return NaN, stddev_pop
return 0, when count =0, stddev/stddev_samp/stddev_pop all return null. same
for variance, kurtosis, swewness, this was the inital proposal.. for average,
will continue to return null when count = 0?
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