Trait HasAggStatus 

pub trait HasAggStatus {
    type Status;
}

The SELECT-list status of a type that can appear in a SELECT list.

Implemented for columns (always AllScalar), SQLExpr, and the expression wrappers in this module.

Required Associated Types

type Status

AllScalar, AllAgg or MixedAgg.

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

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

type Status = <A as AggregateKind>::Status