Struct LengthOperation 

pub struct LengthOperation;

Trait Implementations

impl Clone for LengthOperation

fn clone(&self) -> LengthOperation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<V> ElementKernel<Bare<V>> for LengthOperation

where V: StringValue + BareValueDomain,

type Emission = Preserving

type OutShape = Bare<Scalar>

fn pipeline<'a>( _graphrecord: &'a GraphRecord, _prepared: Self::Prepared<'a>, ) -> QueryResult<ElementPipeline<'a, Bare<V>, Self>>

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

impl<I, V> ElementKernel<Indexed<I, V>> for LengthOperation

where I: IndexDomain, V: StringValue,

type Emission = Preserving

type OutShape = Indexed<I, Scalar>

fn pipeline<'a>( _graphrecord: &'a GraphRecord, _prepared: Self::Prepared<'a>, ) -> QueryResult<ElementPipeline<'a, Indexed<I, V>, Self>>

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

impl Explain for LengthOperation

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

impl Labeled for LengthOperation

const LABEL: &'static str = "Length"

impl Operation for LengthOperation

where Self: Prepare + OperationInputs + Explain,

type Scope = Element

impl OperationInputs for LengthOperation

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

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

impl OptimizerHints for LengthOperation

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 LengthOperation

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

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

impl PlanInputs for LengthOperation

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

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

impl Prepare for LengthOperation

type Prepared<'a> = ()

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