pub struct Never;
Expand description
This expression is never aggregate, and can appear with any other expression, regardless of whether it is aggregate.
Examples of this are literals. 1
does not care about aggregation.
foo + 1
is always valid, regardless of whether foo
appears in the
group by clause or not.
Trait Implementations§
Source§impl MixedAggregates<Never> for No
impl MixedAggregates<Never> for No
Source§impl MixedAggregates<Never> for Yes
impl MixedAggregates<Never> for Yes
Auto Trait Implementations§
impl Freeze for Never
impl RefUnwindSafe for Never
impl Send for Never
impl Sync for Never
impl Unpin for Never
impl UnwindSafe for Never
Blanket Implementations§
Source§impl<T> AggregateExpressionMethods for T
impl<T> AggregateExpressionMethods for T
Source§fn aggregate_distinct(self) -> AggregateDistinct<Self>where
Self: DistinctDsl,
fn aggregate_distinct(self) -> AggregateDistinct<Self>where
Self: DistinctDsl,
DISTINCT
modifier for aggregate functions Read moreSource§fn aggregate_all(self) -> AggregateAll<Self>where
Self: AllDsl,
fn aggregate_all(self) -> AggregateAll<Self>where
Self: AllDsl,
ALL
modifier for aggregate functions Read moreSource§fn aggregate_filter<P>(self, f: P) -> AggregateFilter<Self, P>
fn aggregate_filter<P>(self, f: P) -> AggregateFilter<Self, P>
Add an aggregate function filter Read more
Source§fn aggregate_order<O>(self, o: O) -> AggregateOrder<Self, O>where
Self: OrderAggregateDsl<O>,
fn aggregate_order<O>(self, o: O) -> AggregateOrder<Self, O>where
Self: OrderAggregateDsl<O>,
Add an aggregate function order Read more
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> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
T: Any,
Source§fn into_any(self: Box<T>) -> Box<dyn Any>
fn into_any(self: Box<T>) -> Box<dyn Any>
Converts
Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
, which can then be
downcast
into Box<dyn ConcreteType>
where ConcreteType
implements Trait
.Source§fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
Converts
Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
, which can then be further
downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
.Source§fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Converts
&Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s.Source§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Converts
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s.Source§impl<T> DowncastSend for T
impl<T> DowncastSend for T
Source§impl<T> DowncastSync for T
impl<T> DowncastSync for T
Source§impl<T> IntoSql for T
impl<T> IntoSql for T
Source§impl<T> WindowExpressionMethods for T
impl<T> WindowExpressionMethods for T
Source§fn over(self) -> Over<Self>where
Self: OverDsl,
fn over(self) -> Over<Self>where
Self: OverDsl,
Turn a function call into a window function call Read more
Source§fn window_filter<P>(self, f: P) -> WindowFilter<Self, P>
fn window_filter<P>(self, f: P) -> WindowFilter<Self, P>
Add a filter to the current window function Read more
Source§fn partition_by<E>(self, expr: E) -> PartitionBy<Self, E>where
Self: PartitionByDsl<E>,
fn partition_by<E>(self, expr: E) -> PartitionBy<Self, E>where
Self: PartitionByDsl<E>,
Add a partition clause to the current window function Read more
Source§fn window_order<E>(self, expr: E) -> WindowOrder<Self, E>where
Self: OrderWindowDsl<E>,
fn window_order<E>(self, expr: E) -> WindowOrder<Self, E>where
Self: OrderWindowDsl<E>,
Add a order clause to the current window function Read more