Struct datafusion::physical_plan::limit::LocalLimitExec

pub struct LocalLimitExec { /* private fields */ }

LocalLimitExec applies a limit to a single partition

Implementations

impl LocalLimitExec

pub fn new(input: Arc<dyn ExecutionPlan>, fetch: usize) -> Self

Create a new LocalLimitExec partition

pub fn input(&self) -> &Arc<dyn ExecutionPlan>

Input execution plan

pub fn fetch(&self) -> usize

Maximum number of rows to fetch

Trait Implementations

impl Debug for LocalLimitExec

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

Formats the value using the given formatter.

impl ExecutionPlan for LocalLimitExec

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 output_partitioning(&self) -> Partitioning

Specifies the output partitioning scheme of this plan

fn relies_on_input_order(&self) -> bool

Returns true if this operator relies on its inputs being produced in a certain order (for example that they are sorted a particular way) for correctness.

fn benefits_from_input_partitioning(&self) -> bool

Returns true if this operator would benefit from partitioning its input (and thus from more parallelism). For operators that do very little work the overhead of extra parallelism may outweigh any benefits

fn output_ordering(&self) -> Option<&[PhysicalSortExpr]>

If the output of this operator is sorted, returns Some(keys) with the description of how it was sorted.

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

Returns a new plan where all children were replaced by new plans.

fn execute(
    &self,
    partition: usize,
    context: Arc<TaskContext>
) -> Result<SendableRecordBatchStream>

creates an iterator

fn fmt_as(&self, t: DisplayFormatType, f: &mut Formatter<'_>) -> Result

Format this ExecutionPlan to f in the specified type.

fn metrics(&self) -> Option<MetricsSet>

Return a snapshot of the set of Metrics for this ExecutionPlan.

fn statistics(&self) -> Statistics

Returns the global output statistics for this ExecutionPlan node.

fn required_child_distribution(&self) -> Distribution

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

fn maintains_input_order(&self) -> bool

Returns false if this operator’s implementation may reorder rows within or between partitions.