Enum Cardinality 

pub enum Cardinality {
    Unique,
    Categorical,
    HighCardinality,
    Empty,
}

Coarse cardinality bucket — what an agent needs to decide “is this a dimension or a measure?”.

Variants

Unique

Every non-null value is distinct.

Categorical

Few distinct values (≤20) and at most half of rows. Lookup-friendly.

HighCardinality

Many distinct values, not unique. Typical for measures, IDs, names.

Empty

Column has no non-null cells.

Implementations

impl Cardinality

pub fn as_str(self) -> &'static str

Trait Implementations

impl Clone for Cardinality

fn clone(&self) -> Cardinality

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Cardinality

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

Formats the value using the given formatter.

impl PartialEq for Cardinality

fn eq(&self, other: &Cardinality) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Cardinality

impl Eq for Cardinality

impl StructuralPartialEq for Cardinality