presto-parser/src/main/java/io/prestosql/sql/tree/Format.java/Format/Format
class Format:    private Format(Optional<NodeLocation> location, List<Expression> arguments)
    {
        super(location);
        requireNonNull(arguments, "arguments is null");
        checkArgument(arguments.size() >= 2, "must have at least two arguments");
        this.arguments = ImmutableList.copyOf(arguments);
    }