Struct CountAggregate 

pub struct CountAggregate;

Count aggregate.

Trait Implementations

impl AggregateFunction for CountAggregate

fn create_accumulator(&self) -> Vec<u8>

Create initial accumulator.

fn add(&self, accumulator: Vec<u8>, _value: Vec<u8>) -> Vec<u8>

Add a value to the accumulator.

fn get_result(&self, accumulator: Vec<u8>) -> Vec<u8>

Get the result from the accumulator.

fn merge(&self, acc1: Vec<u8>, acc2: Vec<u8>) -> Vec<u8>

Merge two accumulators.

impl Clone for CountAggregate

fn clone(&self) -> CountAggregate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CountAggregate

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CountAggregate

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for CountAggregate

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

where __S: Serializer,

Serialize this value into the given Serde serializer.