Struct CrushOpts 

pub struct CrushOpts {
    pub drop_entropy: f64,
    pub max_depth: usize,
    pub max_items: usize,
}

Tuning for a crush pass.

Fields

drop_entropy: f64

Distinct-value ratio (distinct / items) at or above which an all-present column is dropped (lossy). 1.0 disables dropping, making the pass strictly lossless.

max_depth: usize

Maximum recursion depth before a subtree is left untouched.

max_items: usize

Arrays larger than this are left untouched (pathology guard).

Implementations

impl CrushOpts

pub fn lossless() -> Self

Strictly lossless options (no column dropping).

pub fn lossy(drop_entropy: f64) -> Self

Lossy options that drop columns whose distinct-value ratio is >= drop_entropy (clamped to [0, 1]).

Trait Implementations

impl Clone for CrushOpts

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 CrushOpts

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

Formats the value using the given formatter.

impl Default for CrushOpts

fn default() -> Self

Returns the “default value” for a type.