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SumAggregator

laminar_core::operator::window

Struct SumAggregator 

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pub struct SumAggregator { /* private fields */ }
Expand description

Sum aggregator - sums i64 values from events.

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impl SumAggregator

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pub fn new(column_index: usize) -> Self

Creates a new sum aggregator for the specified column.

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impl Aggregator for SumAggregator

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type Acc = SumAccumulator

The accumulator type used by this aggregator.
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fn create_accumulator(&self) -> SumAccumulator

Creates a new empty accumulator.
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fn extract(&self, event: &Event) -> Option<i64>

Extracts a value from an event to be aggregated. Read more
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fn output_data_type(&self) -> DataType

Returns the Arrow [DataType] for this aggregator’s output. Read more
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fn output_nullable(&self) -> bool

Returns whether the output is nullable (e.g., empty windows produce null). Read more
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fn extract_batch( &self, event: &Event, ) -> SmallVec<[<Self::Acc as Accumulator>::Input; 4]>

Extracts all values from a multi-row batch event. Read more
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impl Clone for SumAggregator

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fn clone(&self) -> SumAggregator

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for SumAggregator

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

Formats the value using the given formatter. Read more

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impl<T> Any for T
where T: 'static + ?Sized,

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type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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fn instrument(self, span: Span) -> Instrumented<Self>

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