Enum Absent 

pub enum Absent {
    Null,
    Default(Slice),
    Error,
}

What a projected field reads as in a row that does not have it: a segment written without the column, a null cell, or a row value the ValueProjector finds no such field in.

Variants

Null

The cell is null: the column carries a validity bitmap and the row’s bit is clear.

Default(Slice)

The cell reads as this value, which must fit the field’s type.

Error

The scan fails, naming the field.

Trait Implementations

impl Clone for Absent

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Absent

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Absent

impl PartialEq for Absent

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Absent