Github user wangyum 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 --
    Yes, we migrated Hive and MySQL SQLs to Spark, and found some 
inconsistencies. `NaN` is unfamiliar to MySQL and Oracle users

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