Struct SlidingSumAccumulator 

struct SlidingSumAccumulator<T: ArrowNumericType> {
    sum: T::Native,
    count: u64,
    data_type: DataType,
}

This accumulator incrementally computes sums over a sliding window

This is separate from SumAccumulator as requires additional state

Fields

sum: T::Native

count: u64

data_type: DataType

Implementations

impl<T: ArrowNumericType> SlidingSumAccumulator<T>

fn new(data_type: DataType) -> Self

Trait Implementations

impl<T: ArrowNumericType> Accumulator for SlidingSumAccumulator<T>

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

Returns the intermediate state of the accumulator, consuming the intermediate state.

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

Updates the accumulator’s state from its input.

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

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

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

Returns the final aggregate value, consuming the internal state.

fn size(&self) -> usize

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

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

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

fn supports_retract_batch(&self) -> bool

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

impl<T: ArrowNumericType> Debug for SlidingSumAccumulator<T>

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

Formats the value using the given formatter.