Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20618#discussion_r169300055
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala
---
@@ -262,6 +272,10 @@ case class Cos(child: Expression) extends
UnaryMathExpression(math.cos, "COS")
@ExpressionDescription(
usage = "_FUNC_(expr) - Returns the hyperbolic cosine of `expr`.",
+ arguments = """
+ Arguments:
+ * expr - hyperbolic angle.
--- End diff --
not a big deal but let's remove the trailing `.` for consistency.
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