Struct Data Fusion Aggregate Factory &nbsp; Copy item path

impl DataFusionAggregateFactory

pub fn new( udf: Arc<AggregateUDF>, column_indices: Vec<usize>, input_types: Vec<DataType>, ) -> Self

Creates a new factory for the given DataFusion aggregate UDF.

pub fn with_distinct(self, distinct: bool) -> Self

Creates a new factory with the DISTINCT flag set.

pub fn name(&self) -> &str

Returns the name of the wrapped aggregate function.

impl DataFusionAggregateFactory

pub fn create_accumulator_with_factory( self: &Arc<Self>, ) -> Result<Box<dyn DynAccumulator>, DataFusionError>

Creates an accumulator adapter with a back-reference to this factory.

The factory must be wrapped in an Arc for the adapter to support clone_box().

§Errors

Returns DataFusionError if the underlying UDF fails to create an accumulator.

Trait Implementations§

impl Debug for DataFusionAggregateFactory

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

Formats the value using the given formatter. Read more

impl DynAggregatorFactory for DataFusionAggregateFactory

fn create_accumulator(&self) -> Box<dyn DynAccumulator>

Creates a new empty accumulator.

fn result_field(&self) -> Field

Returns the Arrow field descriptor for results.

fn clone_box(&self) -> Box<dyn DynAggregatorFactory>

Creates a boxed clone of this factory.

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

Returns a type tag for deserialization dispatch.

Auto Trait Implementations§

impl !UnwindSafe for DataFusionAggregateFactory

Blanket Implementations§

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

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> ArchivePointee for T

type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.

fn pointer_metadata( _: &<T as ArchivePointee>::ArchivedMetadata, ) -> <T as Pointee>::Metadata

Converts some archived metadata to the pointer metadata for itself.

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

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

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

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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

fn into(self) -> U

Calls U::from(self).

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

impl<T> IntoEither for T

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

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