Trait MapNullable 

pub trait MapNullable {
    type Output;
}

Flip every table already in a scope to MaybeNull. Used by RIGHT/FULL JOIN, which must retroactively make every previously-joined table nullable (mirrors Drizzle’s AppendToNullabilityMap), before adding the newly-joined table’s own slot.

Required Associated Types

type Output

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl MapNullable for Nil

type Output = Nil

impl<T: Table, N: Nullability, Tail: MapNullable> MapNullable for Cons<TableSlot<T, N>, Tail>

type Output = Cons<TableSlot<T, MaybeNull>, <Tail as MapNullable>::Output>