Github user misutoth commented on a diff in the pull request: https://github.com/apache/spark/pull/20618#discussion_r169313008 --- 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`.", --- End diff -- Yes, we should
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