Trait ExprValueType 

pub trait ExprValueType {
    type ValueType;
}

Row inference types and traits. Resolves the Rust value type for a column or typed expression.

Implemented for:

• Column ZSTs (proc macro generates alongside ColumnValueType)
• SQLExpr<T, N, A> where T: SQLTypeToRust<D> and N: WrapNullable

For SQL<'a, V> (raw SQL), ValueType = () — the user must specify the concrete row type via turbofish (.all::<T>()).

Required Associated Types

type ValueType

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl<E> ExprValueType for AliasedExpr<E>

where E: ExprValueType,

type ValueType = <E as ExprValueType>::ValueType

impl<Lhs, Rhs, Op> ExprValueType for ColumnBinOp<Lhs, Rhs, Op>

where Lhs: ExprValueType,

type ValueType = <Lhs as ExprValueType>::ValueType

impl<T> ExprValueType for ColumnNeg<T>

where T: ExprValueType,

type ValueType = <T as ExprValueType>::ValueType

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

where V: SQLParam, T: DataType + SQLTypeToRust<<V as SQLParam>::DialectMarker>, N: Nullability + WrapNullable<<T as SQLTypeToRust<<V as SQLParam>::DialectMarker>>::RustType>, A: AggregateKind,

type ValueType = <N as WrapNullable<<T as SQLTypeToRust<<V as SQLParam>::DialectMarker>>::RustType>>::Output

impl<V> ExprValueType for SQL<'_, V>

where V: SQLParam,

Raw SQL fallback — value type is (), user must specify the concrete type.

type ValueType = ()