Github user yijieshen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6938#discussion_r33115774
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/MathFunctionsSuite.scala
---
@@ -252,4 +254,33 @@ class MathFunctionsSuite extends SparkFunSuite with
ExpressionEvalHelper {
null,
create_row(null))
}
+
+ test("round test") {
+ val domain = -16 to 16
+ val doublePi = math.Pi
+ val stringPi = "3.141592653589793"
+ val intPi = 314159265
+ val bdPi = BigDecimal(31415926535897932L, 10)
+
+ domain.foreach { scale =>
+ checkEvaluation(Round(doublePi, scale),
+ BigDecimal.valueOf(doublePi).setScale(scale,
RoundingMode.HALF_UP).toDouble, EmptyRow)
--- End diff --
I think we are not comparing with itself, rather, checking the `Round` to
see if it is branching to the right logic and run as expected.
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