ReadCsvOptions

Struct ReadCsvOptions 

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pub struct ReadCsvOptions {
    pub delimiter: u8,
    pub has_header: bool,
    pub infer_schema: bool,
    pub infer_schema_length: Option<usize>,
    pub dtypes: Option<HashMap<String, DataType>>,
    pub skip_rows: usize,
    pub comment_char: Option<u8>,
    pub use_columns: Option<Vec<String>>,
    pub na_values: Option<HashSet<String>>,
}
Expand description

CSV 读取配置选项

提供了丰富的 CSV 文件读取配置,支持自定义分隔符、数据类型推断、 列选择等功能。

§示例

use axion::io::csv::{ReadCsvOptions, read_csv};
use axion::dtype::DataType;
use std::collections::HashMap;
 
// 使用默认配置
let df1 = read_csv("data.csv", None)?;
 
// 使用自定义配置
let options = ReadCsvOptions::builder()
    .with_delimiter(b';')
    .with_header(true)
    .infer_schema(true)
    .build();
let df2 = read_csv("data.csv", Some(options))?;

Fields§

§delimiter: u8

字段分隔符,默认为 ,

§has_header: bool

CSV 文件是否包含表头行,默认为 true 如果为 false,列名将自动生成为 “column_0”, “column_1”, …

§infer_schema: bool

尝试推断列的数据类型,默认为 true 如果为 false,所有列将被读取为字符串

§infer_schema_length: Option<usize>

用于类型推断的最大行数,默认为 100 如果为 None,则使用所有行进行推断

§dtypes: Option<HashMap<String, DataType>>

可选的 HashMap,用于手动指定某些列的数据类型 手动指定的类型将覆盖类型推断的结果

§skip_rows: usize

跳过文件开头的 N 行,默认为 0

§comment_char: Option<u8>

将以此字符开头的行视作注释并忽略,默认为 None

§use_columns: Option<Vec<String>>

可选的列选择器,指定要读取的列名子集 如果为 None,则读取所有列

§na_values: Option<HashSet<String>>

一组应被视为空值的字符串,默认为 None

Implementations§

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impl ReadCsvOptions

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pub fn builder() -> ReadCsvOptionsBuilder

创建一个新的 ReadCsvOptions 构建器,使用默认值

Trait Implementations§

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impl Clone for ReadCsvOptions

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fn clone(&self) -> ReadCsvOptions

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for ReadCsvOptions

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

Formats the value using the given formatter. Read more
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impl Default for ReadCsvOptions

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fn default() -> Self

Returns the “default value” for a type. Read more

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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