Github user misutoth commented on a diff in the pull request: https://github.com/apache/spark/pull/20618#discussion_r169313329 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala --- @@ -548,7 +579,14 @@ case class Sqrt(child: Expression) extends UnaryMathExpression(math.sqrt, "SQRT" case class Tan(child: Expression) extends UnaryMathExpression(math.tan, "TAN") @ExpressionDescription( - usage = "_FUNC_(expr) - Returns the cotangent of `expr`.", + usage = """ + _FUNC_(expr) - Returns the cotangent of `expr`, as if computed by + `1/java.lang.Math._FUNC_`. --- End diff -- yes
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