Github user highfei2011 commented on a diff in the pull request:
    --- Diff: 
    @@ -170,29 +193,29 @@ case class Pi() extends LeafMathExpression(math.Pi, 
     // scalastyle:off line.size.limit
    -  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 = """
           > SELECT _FUNC_(1);
           > SELECT _FUNC_(2);
    -       NaN
    +       NULL
    --- End diff --
    NaN represents a variety of meanings, and Null is a special case, then we 
need to modify?
    Personally think that may not be necessary. @viirya do you think?

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