Struct datafusion_physical_expr::expressions::AvgAccumulator

pub struct AvgAccumulator { /* private fields */ }

An accumulator to compute the average

Trait Implementations

impl Accumulator for AvgAccumulator

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

Returns the intermediate state of the accumulator.

fn update_batch(&mut self, values: &[ArrayRef]) -> Result<()>

Updates the accumulator’s state from its input.

fn retract_batch(&mut self, values: &[ArrayRef]) -> Result<()>

Retracts (removed) an update (caused by the given inputs) to accumulator’s state.

fn merge_batch(&mut self, states: &[ArrayRef]) -> Result<()>

Updates the accumulator’s state from an Array containing one or more intermediate values.

fn evaluate(&self) -> Result<ScalarValue>

Returns the final aggregate value.

fn supports_retract_batch(&self) -> bool

Does the accumulator support incrementally updating its value by removing values.

fn size(&self) -> usize

Returns the allocated size required for this accumulator, in bytes, including Self.

impl Debug for AvgAccumulator

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

Formats the value using the given formatter.

impl Default for AvgAccumulator

fn default() -> AvgAccumulator

Returns the “default value” for a type.