[−][src]Struct datafusion::physical_plan::expressions::Count
COUNT aggregate expression Returns the amount of non-null values of the given expression.
Implementations
impl Count
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pub fn new(
expr: Arc<dyn PhysicalExpr>,
name: String,
data_type: DataType
) -> Self
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expr: Arc<dyn PhysicalExpr>,
name: String,
data_type: DataType
) -> Self
Create a new COUNT aggregate function.
Trait Implementations
impl AggregateExpr for Count
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fn field(&self) -> Result<Field>
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fn state_fields(&self) -> Result<Vec<Field>>
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fn expressions(&self) -> Vec<Arc<dyn PhysicalExpr>>
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fn create_accumulator(&self) -> Result<Rc<RefCell<dyn Accumulator>>>
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impl Debug for Count
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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,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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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>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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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>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,