Github user zhengruifeng commented on the issue:
https://github.com/apache/spark/pull/12135
@MLnick It seems that tests for NaN is added here
https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/DataFrameStatSuite.scala#L153
SPARK-17219 has two corresponding PR, and the author added tests in
https://github.com/apache/spark/pull/15428
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