Enum LevelSelection 

pub enum LevelSelection {
    All {
        count: usize,
    },
    Sparse(SelectionVector),
}

Selection state for a single factorization level.

Supports both sparse (for low selectivity) and dense (for high selectivity) representations to optimize memory usage.

Variants

All

All values at this level are selected.

Fields

count: usize

Total count of values at this level.

Sparse(SelectionVector)

Only specific indices are selected (for low selectivity).

Uses SelectionVector which stores indices as u16.

Implementations

impl LevelSelection

pub fn all(count: usize) -> Self

Creates a selection that selects all values.

pub fn from_predicate<F>(count: usize, predicate: F) -> Self

where F: Fn(usize) -> bool,

Creates a sparse selection from a predicate.

pub fn selected_count(&self) -> usize

Returns the number of selected values.

pub fn is_selected(&self, physical_idx: usize) -> bool

Returns true if a physical index is selected.

pub fn filter<F>(&self, predicate: F) -> Self

where F: Fn(usize) -> bool,

Filters this selection with a predicate, returning a new selection.

pub fn iter(&self) -> Box<dyn Iterator<Item = usize> + '_>

Returns an iterator over selected indices.

Trait Implementations

impl Clone for LevelSelection

fn clone(&self) -> LevelSelection

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LevelSelection

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

Formats the value using the given formatter.