Struct BoundDefault 

pub struct BoundDefault {
    pub column: u16,
    pub expr: BoundExpr,
}

A NOT NULL column’s DEFAULT, bound so a REPLACE can stand it in.

REPLACE’s rule for a NOT NULL violation is to substitute the column’s default, and to fall back to ABORT only when there is no default. So UPDATE OR REPLACE t SET c = NULL on c TEXT NOT NULL DEFAULT 'd' stores 'd', and this engine used to refuse the statement instead.

The write path cannot bind one for itself: a default is schema text, and by the time a row is being checked the parser is long out of scope. The binder already binds one for every column a statement omits; these are the same expressions bound for the columns it supplies, which is where a NULL that needs replacing can come from.

Only the columns that can need it are here - NOT NULL and with a default - so an ordinary table carries an empty vector and the write path skips the whole apparatus.

Fields

column: u16

The column the default belongs to.

expr: BoundExpr

The default expression, bound.

Trait Implementations

impl Clone for BoundDefault

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 BoundDefault

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

Formats the value using the given formatter.

impl PartialEq for BoundDefault

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BoundDefault