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From wangyum <>
Subject [GitHub] spark pull request #18841: [SPARK-21635][SQL] ACOS(2) and ASIN(2) should be ...
Date Sat, 05 Aug 2017 16:40:33 GMT
Github user wangyum commented on a diff in the pull request:
    --- 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
    -  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 --
    Spark handles some `NaN`:
    I think Spark keeps pace with the database as much as possible, otherwise SQL migration
is troublesome. 

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