Struct ReadCsvOptionsBuilder 

pub struct ReadCsvOptionsBuilder { /* private fields */ }

ReadCsvOptions 的构建器

提供了一种链式调用的方式来配置 CSV 读取选项。

示例

let options = ReadCsvOptions::builder()
    .with_delimiter(b';')
    .with_header(true)
    .skip_rows(2)
    .build();

Implementations

impl ReadCsvOptionsBuilder

pub fn new() -> Self

创建一个新的构建器实例

pub fn with_delimiter(self, delimiter: u8) -> Self

设置字段分隔符

pub fn with_header(self, has_header: bool) -> Self

设置是否包含表头行

pub fn infer_schema(self, infer: bool) -> Self

设置是否启用类型推断

pub fn infer_schema_length(self, length: Option<usize>) -> Self

设置类型推断使用的行数

pub fn with_dtypes(self, dtypes: HashMap<String, DataType>) -> Self

设置列数据类型映射

pub fn add_dtype(self, column_name: String, dtype: DataType) -> Self

添加单个列的数据类型

pub fn skip_rows(self, n: usize) -> Self

设置跳过的行数

pub fn comment_char(self, char_opt: Option<u8>) -> Self

设置注释字符

pub fn use_columns(self, columns: Vec<String>) -> Self

设置要读取的列

pub fn add_use_column(self, column_name: String) -> Self

添加要读取的列

pub fn na_values(self, values: Option<HashSet<String>>) -> Self

设置 null 值表示

pub fn add_na_value(self, value: String) -> Self

添加 null 值表示

pub fn build(self) -> ReadCsvOptions

构建最终的 ReadCsvOptions 实例

Trait Implementations

impl Clone for ReadCsvOptionsBuilder

fn clone(&self) -> ReadCsvOptionsBuilder

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ReadCsvOptionsBuilder

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ReadCsvOptionsBuilder

fn default() -> ReadCsvOptionsBuilder

Returns the “default value” for a type.