pub struct CountStarFunction;
Expand description
COUNT(*) - counts all rows including nulls
Trait Implementations§
Source§impl AggregateFunction for CountStarFunction
impl AggregateFunction for CountStarFunction
Source§fn init(&self) -> AggregateState
fn init(&self) -> AggregateState
Initialize the aggregation state
Source§fn accumulate(
&self,
state: &mut AggregateState,
_value: &DataValue,
) -> Result<()>
fn accumulate( &self, state: &mut AggregateState, _value: &DataValue, ) -> Result<()>
Add a value to the aggregation
Source§fn finalize(&self, state: AggregateState) -> DataValue
fn finalize(&self, state: AggregateState) -> DataValue
Finalize and return the result
Source§fn requires_numeric(&self) -> bool
fn requires_numeric(&self) -> bool
Check if this function requires numeric input
Auto Trait Implementations§
impl Freeze for CountStarFunction
impl RefUnwindSafe for CountStarFunction
impl Send for CountStarFunction
impl Sync for CountStarFunction
impl Unpin for CountStarFunction
impl UnwindSafe for CountStarFunction
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
Source§impl<T> Instrument for T
impl<T> Instrument for T
Source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
Source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
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 moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
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