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).

Trait Implementations§

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impl Operator for HashAggregateOperator

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fn next(&mut self) -> OperatorResult

Pulls the next batch of data. Returns None when exhausted.

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fn reset(&mut self)

Resets to initial state so you can iterate again.

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fn name(&self) -> &'static str

Returns a name for debugging/explain output.

Auto Trait Implementations§

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impl !UnwindSafe for HashAggregateOperator

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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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 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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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