Enum FnVolatility 

pub enum FnVolatility {
    Immutable,
    Stable,
    Volatile,
    Modifying,
}

Variants

Immutable

Same arguments always produce the same result — safe anywhere.

Stable

Result is fixed within a single statement, but may vary between statements (session settings, current transaction time).

Volatile

Result may differ on every call (random(), uuidv7(), clock_timestamp()). Wanted in a pointer default, almost always a bug inside a filter predicate.

Modifying

Volatile and side-effecting — advancing or resetting a sequence. Never admissible in an expression the caller expects to be a pure predicate, since it would fire once per row.

Implementations

impl FnVolatility

pub fn as_str(&self) -> &'static str

Lowercase wire name, as consumed by the Python std namespace gate.

Trait Implementations

impl Clone for FnVolatility

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 FnVolatility

impl Debug for FnVolatility

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

Formats the value using the given formatter.

impl Eq for FnVolatility

impl PartialEq for FnVolatility

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FnVolatility