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

    https://github.com/apache/spark/pull/18841#discussion_r131532373
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala
 ---
    @@ -170,29 +193,29 @@ case class Pi() extends LeafMathExpression(math.Pi, 
"PI")
     
     // scalastyle:off line.size.limit
     @ExpressionDescription(
    -  usage = "_FUNC_(expr) - Returns the inverse cosine (a.k.a. arccosine) of 
`expr` if -1<=`expr`<=1 or NaN otherwise.",
    +  usage = "_FUNC_(expr) - Returns the inverse cosine (a.k.a. arccosine) of 
`expr` if -1<=`expr`<=1 or NULL otherwise.",
       extended = """
         Examples:
           > SELECT _FUNC_(1);
            0.0
           > SELECT _FUNC_(2);
    -       NaN
    +       NULL
    --- End diff --
    
    Suddenly changing this might break user codes. ACOS and ASIN exist for a 
while in SparkSQL,


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