Struct datafusion_expr::AggregateUDF
source · [−]pub struct AggregateUDF {
pub name: String,
pub signature: Signature,
pub return_type: ReturnTypeFunction,
pub accumulator: AccumulatorFunctionImplementation,
pub state_type: StateTypeFunction,
}
Expand description
Logical representation of a user-defined aggregate function (UDAF) A UDAF is different from a UDF in that it is stateful across batches.
Fields
name: String
name
signature: Signature
signature
return_type: ReturnTypeFunction
Return type
accumulator: AccumulatorFunctionImplementation
actual implementation
state_type: StateTypeFunction
the accumulator’s state’s description as a function of the return type
Implementations
sourceimpl AggregateUDF
impl AggregateUDF
sourcepub fn new(
name: &str,
signature: &Signature,
return_type: &ReturnTypeFunction,
accumulator: &AccumulatorFunctionImplementation,
state_type: &StateTypeFunction
) -> Self
pub fn new(
name: &str,
signature: &Signature,
return_type: &ReturnTypeFunction,
accumulator: &AccumulatorFunctionImplementation,
state_type: &StateTypeFunction
) -> Self
Create a new AggregateUDF
Trait Implementations
sourceimpl Clone for AggregateUDF
impl Clone for AggregateUDF
sourcefn clone(&self) -> AggregateUDF
fn clone(&self) -> AggregateUDF
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl Debug for AggregateUDF
impl Debug for AggregateUDF
sourceimpl Hash for AggregateUDF
impl Hash for AggregateUDF
sourceimpl PartialEq<AggregateUDF> for AggregateUDF
impl PartialEq<AggregateUDF> for AggregateUDF
Auto Trait Implementations
impl !RefUnwindSafe for AggregateUDF
impl Send for AggregateUDF
impl Sync for AggregateUDF
impl Unpin for AggregateUDF
impl !UnwindSafe for AggregateUDF
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more