Struct ConstraintSpec 

pub struct ConstraintSpec {
    pub column: i32,
    pub op: ConstraintOp,
    pub usable: bool,
}

One constraint the query offers the module.

Fields

column: i32

Which column, or ROWID_COLUMN.

op: ConstraintOp

The comparison.

usable: bool

Whether the value is available at the time this loop runs.

A constraint against a table the loop has not reached yet is offered but not usable, which is how one best_index answer serves every position the term could take in the join order.

Trait Implementations

impl Clone for ConstraintSpec

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ConstraintSpec

impl Debug for ConstraintSpec

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

Formats the value using the given formatter.

impl Eq for ConstraintSpec

impl PartialEq for ConstraintSpec

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ConstraintSpec