Struct HashIndex 

pub struct HashIndex { /* private fields */ }

Hash-based index for equality lookups Maps column value -> list of row indices with that value

Implementations

impl HashIndex

pub fn new(column: String) -> Self

Create a new hash index on a specific column

pub fn build(column: &str, rows: &[Row]) -> Self

Build index from a vector of rows

pub fn lookup(&self, value: &Value) -> Option<&Vec<usize>>

Lookup rows by value - returns row indices

pub fn column(&self) -> &str

Get the column name this index is built on

pub fn cardinality(&self) -> usize

Get number of unique values in index

pub fn row_count(&self) -> usize

Get total number of rows indexed

Trait Implementations

impl Clone for HashIndex

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 HashIndex

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

Formats the value using the given formatter.