Struct ProjectionMap 

pub struct ProjectionMap { /* private fields */ }

A stable ordered list of column indices into the base DataFrame.

Selecting 0 columns yields an empty projection (valid empty view). Duplicate names are rejected at construction time – callers must deduplicate. Column ordering is exactly the order supplied by the caller.

Implementations

impl ProjectionMap

pub fn identity(ncols: usize) -> Self

Identity projection (all columns, in original order).

pub fn from_indices(indices: Vec<usize>) -> Self

Construct from explicit column indices.

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn indices(&self) -> &[usize]

Trait Implementations

impl Clone for ProjectionMap

fn clone(&self) -> ProjectionMap

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProjectionMap

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

Formats the value using the given formatter.

impl PartialEq for ProjectionMap

fn eq(&self, other: &ProjectionMap) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for ProjectionMap

impl StructuralPartialEq for ProjectionMap