presto-main/src/main/java/io/prestosql/operator/scalar/MathFunctions.java/MathFunctions/fromBase
class MathFunctions:    @Description("convert a string in the given base to a number")
    @ScalarFunction
    @LiteralParameters("x")
    @SqlType(StandardTypes.BIGINT)
    public static long fromBase(@SqlType("varchar(x)") Slice value, @SqlType(StandardTypes.BIGINT) long radix)
    {
        checkRadix(radix);
        try {
            return Long.parseLong(value.toStringUtf8(), (int) radix);
        }
        catch (NumberFormatException e) {
            throw new PrestoException(INVALID_FUNCTION_ARGUMENT, format("Not a valid base-%d number: %s", radix, value.toStringUtf8()), e);
        }
    }