Enum RelationalJoinSelectivity 

pub enum RelationalJoinSelectivity {
    Unknown,
    EquiJoin {
        left_distinct_values: Option<u64>,
        right_distinct_values: Option<u64>,
    },
}

Variants

Unknown

No trustworthy predicate statistics are available. Materialized joins use the documented 10% fallback; probe inputs ignore this value because their row estimate is already a per-outer-row fanout.

EquiJoin

Distinct-value counts for the complete equality key on either side. One known side is still a useful conservative denominator; when both sides are known, the standard 1 / max(left_ndv, right_ndv) estimate is used.

Fields

left_distinct_values: Option<u64>

right_distinct_values: Option<u64>

Implementations

impl RelationalJoinSelectivity

pub const fn equi_join( left_distinct_values: Option<u64>, right_distinct_values: Option<u64>, ) -> RelationalJoinSelectivity

Trait Implementations

impl Clone for RelationalJoinSelectivity

fn clone(&self) -> RelationalJoinSelectivity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RelationalJoinSelectivity

impl Debug for RelationalJoinSelectivity

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

Formats the value using the given formatter.

impl Default for RelationalJoinSelectivity

fn default() -> RelationalJoinSelectivity

Returns the “default value” for a type.

impl Eq for RelationalJoinSelectivity

impl PartialEq for RelationalJoinSelectivity

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RelationalJoinSelectivity