Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6725#discussion_r32073108
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -1299,6 +1299,70 @@ object functions {
*/
def toRadians(columnName: String): Column = toRadians(Column(columnName))
+ /**
+ * Returns the first argument-base logarithm of the second argument.
+ *
+ * @group math_funcs
+ * @since 1.4.0
+ */
+ def logarithm(l: Column, r: Column): Column = Logarithm(l.expr, r.expr)
--- End diff --
let's name the 1st argument as "base", and the second as "a".
and also only keep the following 2 versions:
log(base: Double, a: Column)
log(base: Double, a: String)
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