Struct CsvReadOptions 

pub struct CsvReadOptions {
    pub has_header: bool,
    pub delimiter: u8,
    pub quote_char: Option<u8>,
    pub null_values: Vec<String>,
    pub infer_schema_length: usize,
    pub projection: Option<Vec<String>>,
    pub predicate: Option<Expr>,
}

I/O option types. Options for reading CSV files.

Fields

has_header: bool

Whether the CSV file has a header row.

delimiter: u8

Field delimiter byte (e.g. b',').

quote_char: Option<u8>

Quote character byte (defaults to Some(b'\"')).

null_values: Vec<String>

Values that should be interpreted as null.

infer_schema_length: usize

Maximum number of rows used for schema inference.

projection: Option<Vec<String>>

Optional column projection (names).

predicate: Option<Expr>

Optional predicate expression to apply (may be pushed down in the future).

Implementations

impl CsvReadOptions

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

Set has_header.

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

Set delimiter.

pub fn with_quote_char(self, quote_char: Option<u8>) -> Self

Set quote_char.

pub fn with_null_values<I, S>(self, values: I) -> Self

where I: IntoIterator<Item = S>, S: Into<String>,

Set null_values.

pub fn with_infer_schema_length(self, infer_schema_length: usize) -> Self

Set infer_schema_length.

pub fn with_projection<I, S>(self, columns: I) -> Self

where I: IntoIterator<Item = S>, S: Into<String>,

Set a column projection by name.

pub fn with_predicate(self, predicate: Expr) -> Self

Set a predicate to apply.

Trait Implementations

impl Clone for CsvReadOptions

fn clone(&self) -> CsvReadOptions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CsvReadOptions

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

Formats the value using the given formatter.

impl Default for CsvReadOptions

fn default() -> Self

Returns the “default value” for a type.