presto-main/src/main/java/io/prestosql/operator/scalar/MathFunctions.java/MathFunctions/atan2
class MathFunctions:    @Description("arc tangent of given fraction")
    @ScalarFunction
    @SqlType(StandardTypes.DOUBLE)
    public static double atan2(@SqlType(StandardTypes.DOUBLE) double num1, @SqlType(StandardTypes.DOUBLE) double num2)
    {
        return Math.atan2(num1, num2);
    }