Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6725#discussion_r32246616
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -202,3 +202,27 @@ case class Pow(left: Expression, right: Expression)
"""
}
}
+
+object Logarithm {
+ def apply(exprs: Seq[Expression]): Expression = {
+ if (exprs.length == 1) {
+ new Log(exprs(0))
+ } else if (exprs.length == 2) {
+ new Logarithm(exprs(0), exprs(1))
+ } else {
+ sys.error(s"Log only accepts two input expressions")
+ }
+ }
+ def apply(child: Expression): Expression = new Log(child)
+}
+
+case class Logarithm(left: Expression, right: Expression)
+ extends BinaryMathExpression((c1, c2) => math.log(c2) / math.log(c1),
"LOG") {
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ defineCodeGen(ctx, ev, (c1, c2) => s"java.lang.Math.log($c2) /
java.lang.Math.log($c1)") + s"""
--- End diff --
yes, exactly.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
