Enum FunctionVolatility 

pub enum FunctionVolatility {
    Immutable,
    Stable,
    Volatile,
}

v7.39 (round 322, V46) — PG’s function volatility class. Declarative: it tells the planner how far a call may be moved or folded. SPG records it faithfully (pg_proc.provolatile, pg_get_functiondef) and does not yet exploit it for constant folding.

Variants

Immutable

Stable

Volatile

Implementations

impl FunctionVolatility

pub const fn as_pg_char(self) -> &'static str

PG’s one-character pg_proc.provolatile code.

pub const fn as_sql(self) -> &'static str

Trait Implementations

impl Clone for FunctionVolatility

fn clone(&self) -> FunctionVolatility

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FunctionVolatility

impl Debug for FunctionVolatility

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

Formats the value using the given formatter.

impl Default for FunctionVolatility

fn default() -> FunctionVolatility

Returns the “default value” for a type.

impl Eq for FunctionVolatility

impl PartialEq for FunctionVolatility

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FunctionVolatility