Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18833#discussion_r131566009
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/MathExpressionsSuite.scala
---
@@ -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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