Trait SelectSources 

pub trait SelectSources {
    type Sources;
}

Sources a SELECT reads when it is used as a subquery expression.

A scoped query resolves its clauses and projection against its own FROM/JOIN scope first (At); whatever does not resolve there must be a source of the enclosing query (a correlated reference).

Required Associated Types

type Sources

The sources tree the outer query must contain.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl SelectSources for SelectExpr

type Sources = ()

impl SelectSources for SelectStar

type Sources = ()

impl<Cols> SelectSources for SelectCols<Cols>

where Cols: SelectedExpressionList, Cols::Expressions: ExprSources,

type Sources = <<Cols as SelectedExpressionList>::Expressions as ExprSources>::Sources

impl<M: SelectSources, Scope, Used> SelectSources for Scoped<M, Scope, Used>

type Sources = (Used, At<Scope, <M as SelectSources>::Sources>)

impl<R> SelectSources for SelectAs<R>

type Sources = ()