Struct ColumnLayout 

pub struct ColumnLayout {
    pub name: PlSmallStr,
    pub source: usize,
    pub start: usize,
    pub stride: usize,
    pub width: usize,
    pub count: usize,
    pub physical: Physical,
    pub big_endian: bool,
    pub null: Option<Null>,
    pub logical: Logical,
}

One column: where its values are and how to read them.

Fields

name: PlSmallStr

source: usize

Index into the reader’s sources.

start: usize

Byte offset of row 0’s value.

stride: usize

Bytes from one row’s value to the next.

width: usize

Bytes one value takes.

count: usize

Values side by side in each row: more than one makes the cell an Array.

physical: Physical

big_endian: bool

null: Option<Null>

logical: Logical

Implementations

impl ColumnLayout

pub fn new( name: &str, start: usize, stride: usize, physical: Physical, width: usize, ) -> Self

A plain column of one physical value a row, little-endian.

pub fn value_dtype(&self) -> DataType

The type of one value.

pub fn dtype(&self) -> DataType

The column’s type: the value’s, or an Array of count of them.

pub fn validate(&self) -> PolarsResult<()>

Check the layout reads what it says: widths that fit the type, sensible counts.

Trait Implementations

impl Clone for ColumnLayout

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnLayout

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

Formats the value using the given formatter.