Enum Determinism 

pub enum Determinism {
    Pure,
    SessionScoped,
    Nondeterministic,
}

Determinism characterization — drives planner caching and hoisting.

Variants

Pure

Same inputs always produce identical output. Cacheable; hoistable from loops. Maps to DataFusion Volatility::Immutable.

SessionScoped

Stable within one session (e.g. current_user()). Maps to DataFusion Volatility::Stable.

Nondeterministic

Non-deterministic (rand(), now()). Maps to DataFusion Volatility::Volatile.

Trait Implementations

impl Clone for Determinism

fn clone(&self) -> Determinism

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Determinism

impl Debug for Determinism

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

Formats the value using the given formatter.

impl Default for Determinism

fn default() -> Determinism

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Determinism

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Determinism

impl PartialEq for Determinism

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Determinism

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Determinism