Struct Aggregation 

pub struct Aggregation {
    pub function: AggregateFunction,
    pub field: Option<String>,
}

A single aggregation operation.

Fields

function: AggregateFunction

The aggregation function to apply.

field: Option<String>

Field to aggregate (None for COUNT(*)).

Implementations

impl Aggregation

pub fn count() -> Self

Create a COUNT(*) aggregation.

pub fn count_field(field: impl Into<String>) -> Self

Create a COUNT(field) aggregation.

pub fn sum(field: impl Into<String>) -> Self

Create a SUM aggregation.

pub fn avg(field: impl Into<String>) -> Self

Create an AVG aggregation.

pub fn min(field: impl Into<String>) -> Self

Create a MIN aggregation.

pub fn max(field: impl Into<String>) -> Self

Create a MAX aggregation.

Trait Implementations

impl Archive for Aggregation

where AggregateFunction: Archive, Option<String>: Archive,

const COPY_OPTIMIZATION: CopyOptimization<Self>

An optimization flag that allows the bytes of this type to be copied directly to a writer instead of calling serialize.

type Archived = ArchivedAggregation

The archived representation of this type.

type Resolver = AggregationResolver

The resolver for this type. It must contain all the additional information from serializing needed to make the archived type from the normal type.

fn resolve(&self, resolver: Self::Resolver, out: Place<Self::Archived>)

Creates the archived version of this value at the given position and writes it to the given output.

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 Debug for Aggregation

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

Formats the value using the given formatter.

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<__D: Fallible + ?Sized> Deserialize<Aggregation, __D> for Archived<Aggregation>

where AggregateFunction: Archive, <AggregateFunction as Archive>::Archived: Deserialize<AggregateFunction, __D>, Option<String>: Archive, <Option<String> as Archive>::Archived: Deserialize<Option<String>, __D>,

fn deserialize( &self, deserializer: &mut __D, ) -> Result<Aggregation, <__D as Fallible>::Error>

Deserializes using the given deserializer

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<__S: Fallible + ?Sized> Serialize<__S> for Aggregation

where AggregateFunction: Serialize<__S>, Option<String>: Serialize<__S>,

fn serialize( &self, serializer: &mut __S, ) -> Result<<Self as Archive>::Resolver, <__S as Fallible>::Error>

Writes the dependencies for the object and returns a resolver that can create the archived type.

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