Enum polars_core::prelude::RevMapping

pub enum RevMapping {
    Global(PlHashMap<u32, u32>, Utf8ViewArray, u32),
    Local(Utf8ViewArray, u128),
}

Available on crate feature dtype-categorical only.

Variants

Global(PlHashMap<u32, u32>, Utf8ViewArray, u32)

Hashmap: maps the indexes from the global cache/categorical array to indexes in the local Utf8Array Utf8Array: caches the string values

Local(Utf8ViewArray, u128)

Utf8Array: caches the string values and a hash of all values for quick comparison

Implementations

impl RevMapping

pub fn is_global(&self) -> bool

pub fn is_local(&self) -> bool

pub fn get_categories(&self) -> &Utf8ViewArray

Get the categories in this RevMapping

pub fn build_local(categories: Utf8ViewArray) -> Self

pub fn len(&self) -> usize

Get the length of the RevMapping

pub fn get(&self, idx: u32) -> &str

Categorical to str

pub fn get_optional(&self, idx: u32) -> Option<&str>

pub fn same_src(&self, other: &Self) -> bool

Check if the categoricals have a compatible mapping

pub fn find(&self, value: &str) -> Option<u32>

str to Categorical

Trait Implementations

impl Clone for RevMapping

fn clone(&self) -> RevMapping

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RevMapping

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

Formats the value using the given formatter.

impl Default for RevMapping

fn default() -> Self

Returns the “default value” for a type.