Github user JihongMA commented on a diff in the pull request: https://github.com/apache/spark/pull/6297#discussion_r33313463 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala --- @@ -372,7 +372,7 @@ class DataFrameSuite extends QueryTest { val describeResult = Seq( Row("count", "4", "4"), Row("mean", "33.0", "178.0"), - Row("stddev", "16.583123951777", "10.0"), + Row("stddev", "19.148542155126762", "11.547005383792516"), --- End diff -- Yes, the answer was wrong before, the calculation should divide n-1 not n (number of rows)
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