Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6725#discussion_r32375557
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/MathFunctionsSuite.scala
---
@@ -204,4 +204,22 @@ class MathFunctionsSuite extends SparkFunSuite with
ExpressionEvalHelper {
testBinary(Atan2, math.atan2)
}
+ test("binary log") {
+ val f = (c1: Double, c2: Double) => math.log(c2) / math.log(c1)
+ val domain = (1 to 20).map(v => (v * 0.1, v * 0.2))
+
+ domain.foreach { case (v1, v2) =>
+ checkEvaluation(Logarithm(Literal(v1), Literal(v2)), f(v1 + 0.0, v2
+ 0.0), EmptyRow)
+ checkEvaluation(Logarithm(Literal(v2), Literal(v1)), f(v2 + 0.0, v1
+ 0.0), EmptyRow)
+ }
+ // When base is null, Logarithm is 10-based log.
--- End diff --
if the 1st argument is null, we definitely shouldn't use 10 base
implicitly. can you take a look at what hive returns in that case? maybe just
null.
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