Enum polars::datatypes::categorical::RevMapping

pub enum RevMapping {
    Global(HashMap<u32, u32, RandomState>, BinaryViewArrayGeneric<str>, u32),
    Local(BinaryViewArrayGeneric<str>, u128),
}

Available on crate feature dtype-categorical only.

Variants

Global(HashMap<u32, u32, RandomState>, BinaryViewArrayGeneric<str>, u32)

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

Local(BinaryViewArrayGeneric<str>, 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) -> &BinaryViewArrayGeneric<str>

Get the categories in this RevMapping

pub fn build_local(categories: BinaryViewArrayGeneric<str>) -> RevMapping

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: &RevMapping) -> 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<(), Error>

Formats the value using the given formatter.

impl Default for RevMapping

fn default() -> RevMapping

Returns the “default value” for a type.