Enum Aggregation 

pub enum Aggregation {
    Concat,
    LastWins,
    Reduce,
    Custom,
}

How child results combine back into the plan.

Variants

Concat

Concatenate child outputs in subtask order (the default).

LastWins

Keep only the last completed subtask’s output.

Reduce

Fold children through a reducer (semantics resolved by the scheduler).

Custom

A caller-defined strategy, resolved by the scheduler.

Trait Implementations

impl Clone for Aggregation

fn clone(&self) -> Aggregation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Aggregation

impl Debug for Aggregation

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

Formats the value using the given formatter.

impl Default for Aggregation

fn default() -> Aggregation

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Aggregation

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Aggregation

impl PartialEq for Aggregation

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for Aggregation

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Aggregation