Github user HyukjinKwon commented on a diff in the pull request:
    --- Diff: 
    @@ -403,11 +403,13 @@ class MathExpressionsSuite extends SparkFunSuite with 
ExpressionEvalHelper {
       test("sqrt") {
         testUnary(Sqrt, math.sqrt, (0 to 20).map(_ * 0.1))
    -    testUnary(Sqrt, math.sqrt, (-5 to -1).map(_ * 1.0), expectNaN = true)
    +    testUnary(Sqrt, math.sqrt, (-5 to -1).map(_ * 1.0), expectNull = true)
    --- End diff --
    Yea, I was writing this comment. If `NaN` makes sense in a way, I was 
thinking we couldn't consider this case as a bug that should be fixed.

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