Github user HyukjinKwon commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20618#discussion_r169182420
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala
 ---
    @@ -548,7 +575,13 @@ 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` ," +
    --- End diff --
    
    Ditto for formatting


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