Struct CountOperation 

pub struct CountOperation;

Trait Implementations

impl Clone for CountOperation

fn clone(&self) -> CountOperation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Explain for CountOperation

fn describe<'__explain>( &'__explain self, formatter: &mut ExplainFormatter<'__explain, '_>, ) -> Result

impl Labeled for CountOperation

const LABEL: &'static str = "Count"

impl<V: BareValueDomain> LaneKernel<Bare<V>, Definite> for CountOperation

type Output = OperandHandle<Bare<Scalar>, Definite>

fn execute<'a>( _graphrecord: &'a GraphRecord, value: BareStream<'a, V, Definite>, _prepared: Self::Prepared<'a>, ) -> QueryResult<<Self::Output as EvaluateOperand>::ReturnValue<'a>>

fn estimate(&self, _input: Estimate, _stats: &Stats<'_>) -> Estimate

impl<V: BareValueDomain, O: OrderState> LaneKernel<Bare<V>, Multiple<O>> for CountOperation

type Output = OperandHandle<Bare<Scalar>, Definite>

fn execute<'a>( _graphrecord: &'a GraphRecord, values: BareStream<'a, V, Multiple<O>>, _prepared: Self::Prepared<'a>, ) -> QueryResult<<Self::Output as EvaluateOperand>::ReturnValue<'a>>

fn estimate(&self, _input: Estimate, _stats: &Stats<'_>) -> Estimate

impl<V: BareValueDomain> LaneKernel<Bare<V>, Single> for CountOperation

type Output = OperandHandle<Bare<Scalar>, Definite>

fn execute<'a>( _graphrecord: &'a GraphRecord, value: BareStream<'a, V, Single>, _prepared: Self::Prepared<'a>, ) -> QueryResult<<Self::Output as EvaluateOperand>::ReturnValue<'a>>

fn estimate(&self, _input: Estimate, _stats: &Stats<'_>) -> Estimate

impl<I: IndexDomain, V: ValueDomain> LaneKernel<Indexed<I, V>, Definite> for CountOperation

type Output = OperandHandle<Bare<Scalar>, Definite>

fn execute<'a>( _graphrecord: &'a GraphRecord, value: KeyedStream<'a, I, V, Definite>, _prepared: Self::Prepared<'a>, ) -> QueryResult<<Self::Output as EvaluateOperand>::ReturnValue<'a>>

fn estimate(&self, _input: Estimate, _stats: &Stats<'_>) -> Estimate

impl<I: IndexDomain, V: ValueDomain, O: OrderState> LaneKernel<Indexed<I, V>, Multiple<O>> for CountOperation

type Output = OperandHandle<Bare<Scalar>, Definite>

fn execute<'a>( _graphrecord: &'a GraphRecord, values: KeyedStream<'a, I, V, Multiple<O>>, _prepared: Self::Prepared<'a>, ) -> QueryResult<<Self::Output as EvaluateOperand>::ReturnValue<'a>>

fn estimate(&self, _input: Estimate, _stats: &Stats<'_>) -> Estimate

impl<I: IndexDomain, V: ValueDomain> LaneKernel<Indexed<I, V>, Single> for CountOperation

type Output = OperandHandle<Bare<Scalar>, Definite>

fn execute<'a>( _graphrecord: &'a GraphRecord, value: KeyedStream<'a, I, V, Single>, _prepared: Self::Prepared<'a>, ) -> QueryResult<<Self::Output as EvaluateOperand>::ReturnValue<'a>>

fn estimate(&self, _input: Estimate, _stats: &Stats<'_>) -> Estimate

impl Operation for CountOperation

where Self: Prepare + OperationInputs + Explain,

type Scope = Lane

impl OperationInputs for CountOperation

type Inputs<'__inputs, __Primary: '__inputs> = (&'__inputs __Primary,)

fn inputs<'__inputs, __Primary: '__inputs>( &'__inputs self, primary: &'__inputs __Primary, ) -> Self::Inputs<'__inputs, __Primary>

impl OptimizerHints for CountOperation

fn commutes_with_filter(&self) -> bool

fn allows_limit_pushdown(&self) -> bool

fn is_volatile(&self) -> bool

fn empty_rule(&self) -> EmptyRule

impl PlanIdentity for CountOperation

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

fn identity_hash<__Hasher: Hasher>(&self, state: &mut __Hasher)

impl PlanInputs for CountOperation

fn inputs(&self) -> Vec<&dyn PlanNode>

fn optimize(&self, session: &Session<'_>) -> Transformed<Self>

impl Prepare for CountOperation

type Prepared<'a> = ()

fn prepare<'a>( &'a self, _graphrecord: &'a GraphRecord, _cache: &'a EvaluationCache<'a>, ) -> QueryResult<Self::Prepared<'a>>