Struct datafusion::physical_plan::empty::EmptyExec

pub struct EmptyExec { /* fields omitted */ }

Execution plan for empty relation (produces no rows)

Implementations

impl EmptyExec

pub fn new(schema: SchemaRef) -> Self

Create a new EmptyExec

Trait Implementations

impl Debug for EmptyExec

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

Formats the value using the given formatter.

impl ExecutionPlan for EmptyExec

fn as_any(&self) -> &dyn Any

Return a reference to Any that can be used for downcasting

fn schema(&self) -> SchemaRef

Get the schema for this execution plan

fn children(&self) -> Vec<Arc<dyn ExecutionPlan>>

Get a list of child execution plans that provide the input for this plan. The returned list will be empty for leaf nodes, will contain a single value for unary nodes, or two values for binary nodes (such as joins).

fn required_child_distribution(&self) -> Distribution

Specifies the data distribution requirements of all the children for this operator

fn output_partitioning(&self) -> Partitioning

Get the output partitioning of this plan

fn with_new_children(
    &self,
    children: Vec<Arc<dyn ExecutionPlan>>
) -> Result<Arc<dyn ExecutionPlan>>

Returns a new plan where all children were replaced by new plans. The size of children must be equal to the size of ExecutionPlan::children().

fn execute<'life0, 'async_trait>(
    &'life0 self,
    partition: usize
) -> Pin<Box<dyn Future<Output = Result<Box<dyn RecordBatchReader + Send>>> + Send + 'async_trait>> where
    'life0: 'async_trait,
    Self: 'async_trait, 

creates an iterator