presto-main/src/main/java/io/prestosql/operator/scalar/MathFunctions.java/MathFunctions/round
class MathFunctions:    @Description("round to nearest integer")
    @ScalarFunction
    @SqlType(StandardTypes.BIGINT)
    public static long round(@SqlType(StandardTypes.BIGINT) long num, @SqlType(StandardTypes.INTEGER) long decimals)
    {
        return roundLong(num, decimals);
    }