Enum mz_transform::attribute::cardinality::FactorizerVariable

pub enum FactorizerVariable {
    Id(GlobalId),
    Index(usize),
    Unknown,
}

The variables used in symbolic expressions representing cardinality

Variants

Id(GlobalId)

The total cardinality of a given global id

Index(usize)

The inverse of the number of distinct keys in the index held in the given column, i.e., 1/|# of distinct keys|

TODO(mgree): need to correlate this back to a given global table, to feed in statistics (or have a sub-attribute for collecting this)

Unknown

An unbound local or other unknown quantity

Trait Implementations

impl Clone for FactorizerVariable

fn clone(&self) -> FactorizerVariable

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for FactorizerVariable

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

Formats the value using the given formatter.

impl Ord for FactorizerVariable

fn cmp(&self, other: &FactorizerVariable) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for FactorizerVariable

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for FactorizerVariable

fn partial_cmp(&self, other: &FactorizerVariable) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for FactorizerVariable

impl Eq for FactorizerVariable

impl StructuralPartialEq for FactorizerVariable