[−][src]Struct datafusion::execution::physical_plan::expressions::Count
COUNT aggregate expression Returns the amount of non-null values of the given expression.
Implementations
impl Count[src]
pub fn new(expr: Arc<dyn PhysicalExpr>) -> Self[src]
Create a new COUNT aggregate function.
Trait Implementations
impl AggregateExpr for Count[src]
fn name(&self) -> String[src]
fn data_type(&self, _input_schema: &Schema) -> Result<DataType>[src]
fn evaluate_input(&self, batch: &RecordBatch) -> Result<ArrayRef>[src]
fn create_accumulator(&self) -> Rc<RefCell<dyn Accumulator>>[src]
fn create_reducer(&self, column_index: usize) -> Arc<dyn AggregateExpr>[src]
Auto Trait Implementations
impl !RefUnwindSafe for Count
impl Send for Count
impl Sync for Count
impl Unpin for Count
impl !UnwindSafe for Count
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T[src]
impl<T> From<T> for T[src]
impl<T> Instrument for T[src]
fn instrument(self, span: Span) -> Instrumented<Self>[src]
fn in_current_span(self) -> Instrumented<Self>[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
U: From<T>,
impl<T> IntoRequest<T> for T[src]
fn into_request(self) -> Request<T>[src]
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,
fn vzip(self) -> V
impl<T> WithSubscriber for T[src]
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>, [src]
S: Into<Dispatch>,