Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6938#discussion_r34649239
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/MathFunctionsSuite.scala
---
@@ -336,4 +338,46 @@ class MathFunctionsSuite extends SparkFunSuite with
ExpressionEvalHelper {
null,
create_row(null))
}
+
+ test("round") {
+ val domain = -6 to 6
+ val doublePi: Double = math.Pi
+ val shortPi: Short = 31415
+ val intPi: Int = 314159265
+ val longPi: Long = 31415926535897932L
+ val bdPi: BigDecimal = BigDecimal(31415927L, 7)
+
+ val doubleResults: Seq[Double] = Seq(0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
3.0, 3.1, 3.14, 3.142,
+ 3.1416, 3.14159, 3.141593)
+
+ val shortResults: Seq[Short] = Seq[Short](0, 0, 30000, 31000, 31400,
31420) ++
+ Seq.fill[Short](7)(31415)
+
+ val intResults: Seq[Int] = Seq(314000000, 314200000, 314160000,
314159000, 314159300,
+ 314159270) ++ Seq.fill(7)(314159265)
+
+ val longResults: Seq[Long] = Seq(31415926536000000L,
31415926535900000L,
+ 31415926535900000L, 31415926535898000L, 31415926535897900L,
31415926535897930L) ++
+ Seq.fill(7)(31415926535897932L)
+
+ val bdResults: Seq[BigDecimal] = Seq(BigDecimal(3.0), BigDecimal(3.1),
BigDecimal(3.14),
+ BigDecimal(3.142), BigDecimal(3.1416), BigDecimal(3.14159),
+ BigDecimal(3.141593), BigDecimal(3.1415927))
+
+ domain.zipWithIndex.foreach { case (scale, i) =>
+ checkEvaluation(Round(doublePi, scale), doubleResults(i), EmptyRow)
+ checkEvaluation(Round(shortPi, scale), shortResults(i), EmptyRow)
+ checkEvaluation(Round(intPi, scale), intResults(i), EmptyRow)
+ checkEvaluation(Round(longPi, scale), longResults(i), EmptyRow)
+ }
+
+ // round_scale > current_scale would result in precision increase
+ // and not allowed by o.a.s.s.types.Decimal.changePrecision, therefore
null
+ (0 to 7).foreach { i =>
--- End diff --
i -> scale
---
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