Struct DictionaryEncoder 

pub struct DictionaryEncoder { /* private fields */ }

Dictionary encoder for low-cardinality string columns

Implementations

impl DictionaryEncoder

pub fn new() -> Self

Create a new dictionary encoder

pub fn build(values: &[Vec<u8>]) -> Self

Build dictionary from values

pub fn add_value(&mut self, value: &[u8]) -> u32

Add a value to the dictionary

pub fn encode(&self, value: &[u8]) -> Option<u32>

Encode a value

pub fn decode(&self, idx: u32) -> Option<&[u8]>

Decode an index

pub fn size(&self) -> usize

Get dictionary size

pub fn encode_column(&self, values: &[Vec<u8>]) -> Vec<u8>

Encode entire column

pub fn decode_column(data: &[u8]) -> Result<Vec<Vec<u8>>>

Decode entire column

Trait Implementations

impl Clone for DictionaryEncoder

fn clone(&self) -> DictionaryEncoder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DictionaryEncoder

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

Formats the value using the given formatter.

impl Default for DictionaryEncoder

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for DictionaryEncoder

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for DictionaryEncoder

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.