Enum AggContext 

pub enum AggContext {
    Builtin(Vec<Value>),
    External(ExternalAggState),
}

Aggregate context for accumulating values during GROUP BY. Built-in aggregates use a flat payload representation for efficiency and to share code between register-based and hash-based aggregation (future enhancement).

Variants

Builtin(Vec<Value>)

Built-in aggregates store state as a flat Vec payload. The layout depends on the aggregate function (see init_agg_payload).

External(ExternalAggState)

External (extension) aggregates need FFI state that can’t be serialized.

Implementations

impl AggContext

pub fn compute_external(&self) -> Result<Value>

pub fn payload_mut(&mut self) -> &mut [Value]

Get a mutable reference to the builtin payload as a slice

pub fn payload_vec_mut(&mut self) -> &mut Vec<Value>

Get a mutable reference to the builtin payload Vec (for aggregates that grow the payload, e.g. array_agg).

pub fn payload(&self) -> &[Value]

Get an immutable reference to the builtin payload

Trait Implementations

impl Clone for AggContext

fn clone(&self) -> AggContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AggContext

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

Formats the value using the given formatter.

impl PartialEq for AggContext

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for AggContext

fn partial_cmp(&self, other: &AggContext) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for AggContext