Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r84573952
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala
---
@@ -361,13 +465,27 @@ case class Factorial(child: Expression) extends
UnaryExpression with ImplicitCas
}
@ExpressionDescription(
- usage = "_FUNC_(x) - Returns the natural logarithm of x with base e.",
- extended = "> SELECT _FUNC_(1);\n 0.0")
+ usage = "_FUNC_(expr) - Returns the natural logarithm of x with base
expr.",
--- End diff --
This should be "natural logarithm of expr" only. The base is e, but that's
implied by natural logarithm. OK, you could say "natural logarithm (base e) of
expr"
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