Enum Partitioning 

pub enum Partitioning {
    RoundRobinBatch(usize),
    Hash(Vec<Expr>, usize),
    Range(RangePartitioning),
    DistributeBy(Vec<Expr>),
}

Logical partitioning schemes.

A scheme can describe either requested repartitioning in LogicalPlan::Repartition or a partitioning property declared by a source. Some schemes are only valid as metadata until planner support is added.

For physical execution partitioning, see datafusion_physical_expr::Partitioning.

Variants

RoundRobinBatch(usize)

Allocate batches using a round-robin algorithm and the specified number of partitions

Hash(Vec<Expr>, usize)

Allocate rows based on a hash of one of more expressions and the specified number of partitions.

Range(RangePartitioning)

Partition rows by ranges. See RangePartitioning for the logical contract.

DistributeBy(Vec<Expr>)

The DISTRIBUTE BY clause is used to repartition the data based on the input expressions

Implementations

impl Partitioning

pub fn partition_count(&self) -> Option<usize>

Return the number of partitions, if known.

Trait Implementations

impl Clone for Partitioning

fn clone(&self) -> Partitioning

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Partitioning

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

Formats the value using the given formatter.

impl Eq for Partitioning

impl Hash for Partitioning

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Partitioning

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Partitioning

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl StructuralPartialEq for Partitioning