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HashAggregateOperator

grafeo_core::execution::operators

Struct HashAggregateOperator 

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

Hash-based aggregate operator.

Groups input by key columns and computes aggregations for each group.

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impl HashAggregateOperator

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pub fn new( child: Box<dyn Operator>, group_columns: Vec<usize>, aggregates: Vec<AggregateExpr>, output_schema: Vec<LogicalType>, ) -> Self

Creates a new hash aggregate operator.

§Arguments
  • child - Child operator to read from.
  • group_columns - Column indices to group by.
  • aggregates - Aggregation expressions.
  • output_schema - Schema of the output (group columns + aggregate results).

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impl Operator for HashAggregateOperator

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fn next(&mut self) -> OperatorResult

Returns the next chunk of data, or None if exhausted.
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fn reset(&mut self)

Resets the operator to its initial state.
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fn name(&self) -> &'static str

Returns the name of this operator for debugging.

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

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fn type_id(&self) -> TypeId

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fn borrow(&self) -> &T

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impl<T> BorrowMut<T> for T
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fn borrow_mut(&mut self) -> &mut T

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize

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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

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unsafe fn drop(ptr: usize)

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.