Struct SumAccumulator 

pub struct SumAccumulator { /* private fields */ }

Accumulator for SUM.

Implementations

impl SumAccumulator

pub fn new() -> Self

Create a new sum accumulator.

pub fn with_distinct(distinct: bool) -> Self

Trait Implementations

impl Accumulator for SumAccumulator

fn update(&mut self, value: Option<SqlValue>) -> Result<()>

Update the accumulator with a new value (None for COUNT(*) rows).

fn finalize(&self) -> Result<SqlValue>

Finalize the accumulator and return the resulting SqlValue.

fn state(&self) -> Result<Vec<SqlValue>>

Return the serializable partial aggregate state.

fn merge(&mut self, state: &[SqlValue]) -> Result<()>

Merge a partial state produced by an accumulator of the same function.

fn clone_box(&self) -> Box<dyn Accumulator>

Clone the accumulator as a trait object.

impl Clone for SumAccumulator

fn clone(&self) -> SumAccumulator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SumAccumulator

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

Formats the value using the given formatter.

impl Default for SumAccumulator

fn default() -> Self

Returns the “default value” for a type.