Enum ScalarQueryConstancy 

pub enum ScalarQueryConstancy {
    Constant,
    SlowChanging,
    Volatile,
}

Frozen policy governing whether a scalar call is constant for one query.

This is distinct from ScalarSchemaSafety: SQLite’s slow-changing built-ins are stable for one statement and can therefore be factored out of inner loops, but they are not safe in schema-maintained expressions. The registry derives this metadata from public deterministic registration APIs; only sealed, crate-private built-in registration paths can publish Self::SlowChanging.

Variants

Constant

With identical arguments, the function is stable across statements.

SlowChanging

The function is stable during one query but may change between them.

Volatile

The function may produce a different result on every invocation.

Implementations

impl ScalarQueryConstancy

pub const fn is_query_constant(self) -> bool

Whether the function is stable for the duration of one query.

Trait Implementations

impl Clone for ScalarQueryConstancy

fn clone(&self) -> ScalarQueryConstancy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ScalarQueryConstancy

impl Debug for ScalarQueryConstancy

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

Formats the value using the given formatter.

impl Eq for ScalarQueryConstancy

impl PartialEq for ScalarQueryConstancy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScalarQueryConstancy