Struct mz_transform::analysis::cardinality::Cardinality
source · pub struct Cardinality {
pub stats: BTreeMap<GlobalId, usize>,
}
Expand description
Compute the estimated cardinality of each subtree of a MirRelationExpr from the bottom up.
Fields§
§stats: BTreeMap<GlobalId, usize>
Cardinalities for globally named entities
Implementations§
source§impl Cardinality
impl Cardinality
sourcepub fn with_stats(stats: BTreeMap<GlobalId, usize>) -> Self
pub fn with_stats(stats: BTreeMap<GlobalId, usize>) -> Self
A cardinality estimator with provided statistics for the given global identifiers
source§impl Cardinality
impl Cardinality
fn flat_map( &self, tf: &TableFunc, input: CardinalityEstimate, ) -> CardinalityEstimate
fn predicate( &self, predicate_expr: &MirScalarExpr, unique_columns: &BTreeSet<usize>, ) -> OrderedFloat<f64>
fn filter( &self, predicates: &Vec<MirScalarExpr>, keys: &Vec<Vec<usize>>, input: CardinalityEstimate, ) -> CardinalityEstimate
fn join( &self, equivalences: &Vec<Vec<MirScalarExpr>>, _implementation: &JoinImplementation, unique_columns: BTreeMap<usize, usize>, inputs: Vec<CardinalityEstimate>, ) -> CardinalityEstimate
fn reduce( &self, group_key: &Vec<MirScalarExpr>, expected_group_size: &Option<u64>, input: CardinalityEstimate, ) -> CardinalityEstimate
fn topk( &self, group_key: &Vec<usize>, limit: &Option<MirScalarExpr>, expected_group_size: &Option<u64>, input: CardinalityEstimate, ) -> CardinalityEstimate
fn threshold(&self, input: CardinalityEstimate) -> CardinalityEstimate
Trait Implementations§
source§impl Analysis for Cardinality
impl Analysis for Cardinality
§type Value = CardinalityEstimate
type Value = CardinalityEstimate
The type of value this analysis associates with an expression.
source§fn announce_dependencies(builder: &mut DerivedBuilder<'_>)
fn announce_dependencies(builder: &mut DerivedBuilder<'_>)
Announce any depencies this analysis has on other analyses. Read more
Auto Trait Implementations§
impl Freeze for Cardinality
impl RefUnwindSafe for Cardinality
impl Send for Cardinality
impl Sync for Cardinality
impl Unpin for Cardinality
impl UnwindSafe for Cardinality
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