Github user JihongMA commented on the pull request:
https://github.com/apache/spark/pull/9380#issuecomment-153475180
getStatistics() will continue to return Double value for normal cases,
changing it to return null only for edge cases. is there a strong reason to
return Double.NaN? when count = 0, all other stats function, min, max, avg..
all return null.
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