Struct FirstOperation 

pub struct FirstOperation;

Trait Implementations

impl Clone for FirstOperation

fn clone(&self) -> FirstOperation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Explain for FirstOperation

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

impl Labeled for FirstOperation

const LABEL: &'static str = "First"

impl<V: BareValueDomain> LaneKernel<Bare<V>, Multiple<Ordered>> for FirstOperation

type Output = OperandHandle<Bare<V>, Single>

fn execute<'a>( _graphrecord: &'a GraphRecord, values: BareStream<'a, V, Multiple<Ordered>>, _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>, Multiple<Ordered>> for FirstOperation

type Output = OperandHandle<Indexed<I, V>, Single>

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

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

impl Operation for FirstOperation

where Self: Prepare + OperationInputs + Explain,

type Scope = Lane

impl OperationInputs for FirstOperation

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

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

impl OptimizerHints for FirstOperation

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 FirstOperation

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

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

impl PlanInputs for FirstOperation

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

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

impl Prepare for FirstOperation

type Prepared<'a> = ()

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