Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/6725#discussion_r32371084
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -1084,6 +1084,22 @@ object functions {
def log(columnName: String): Column = log(Column(columnName))
/**
+ * Returns the first argument-base logarithm of the second argument.
+ *
+ * @group math_funcs
+ * @since 1.4.0
+ */
+ def log(base: Double, a: Column): Column = Logarithm(lit(base).expr,
a.expr)
+
+ /**
+ * Returns the first argument-base logarithm of the second argument.
+ *
+ * @group math_funcs
+ * @since 1.4.0
+ */
+ def log(base: Double, a: String): Column = log(base, Column(a))
+
--- End diff --
It is suggested by @rxin. I think it is reasonable because it is hard to
have a use case to returns the logarithm of one column with another column as
base. Usually you want to compute the logarithm values for a column with the
same base.
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