Struct datafusion_physical_expr::equivalence::EquivalentClass

pub struct EquivalentClass { /* private fields */ }

Equivalent Class is a set of Columns that are known to have the same value in all tuples in a relation Equivalent Class is generated by equality predicates, typically equijoin conditions and equality conditions in filters.

Implementations

impl EquivalentClass

pub fn new(head: Column, others: Vec<Column>) -> Self

pub fn head(&self) -> &Column

pub fn others(&self) -> &HashSet<Column>

pub fn contains(&self, col: &Column) -> bool

pub fn insert(&mut self, col: Column) -> bool

pub fn remove(&mut self, col: &Column) -> bool

pub fn iter(&self) -> impl Iterator<Item = &Column>

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

Trait Implementations

impl Clone for EquivalentClass

fn clone(&self) -> EquivalentClass

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for EquivalentClass

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

Formats the value using the given formatter.