Trait HasAggStatus 

pub trait HasAggStatus {
    type Status;
}

Extract the aggregate status of a type that appears in a SELECT list.

Implemented for column ZSTs (always Scalar), SQLExpr, and expression wrappers.

Required Associated Types

type Status

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<T: HasAggStatus + ?Sized> HasAggStatus for &T

type Status = <T as HasAggStatus>::Status

Implementors

impl<E, Name> HasAggStatus for NamedExpr<E, Name>

where E: HasAggStatus,

type Status = <E as HasAggStatus>::Status

impl<E: HasAggStatus> HasAggStatus for AliasedExpr<E>

type Status = <E as HasAggStatus>::Status

impl<Name, Output> HasAggStatus for DerivedField<Name, Output>

where Name: Tag, Output: ProjectionOutput,

type Status = AllScalar

impl<V, T, N, A> HasAggStatus for SQLExpr<'_, V, T, N, A>

where V: SQLParam, T: DataType, N: Nullability, A: AggToStatus,

type Status = <A as AggToStatus>::Status