Struct UnionExec 

pub struct UnionExec { /* private fields */ }

UnionExec: UNION ALL execution plan.

UnionExec combines multiple inputs with the same schema by concatenating the partitions. It does not mix or copy data within or across partitions. Thus if the input partitions are sorted, the output partitions of the union are also sorted.

For example, given a UnionExec of two inputs, with N partitions, and M partitions, there will be N+M output partitions. The first N output partitions are from Input 1 partitions, and then next M output partitions are from Input 2.

                       ▲       ▲           ▲         ▲
                       │       │           │         │
     Output            │  ...  │           │         │
   Partitions          │0      │N-1        │ N       │N+M-1
(passes through   ┌────┴───────┴───────────┴─────────┴───┐
 the N+M input    │              UnionExec               │
  partitions)     │                                      │
                  └──────────────────────────────────────┘
                                     ▲
                                     │
                                     │
      Input           ┌────────┬─────┴────┬──────────┐
    Partitions        │ ...    │          │     ...  │
                   0  │        │ N-1      │ 0        │  M-1
                 ┌────┴────────┴───┐  ┌───┴──────────┴───┐
                 │                 │  │                  │
                 │                 │  │                  │
                 │                 │  │                  │
                 │                 │  │                  │
                 │                 │  │                  │
                 │                 │  │                  │
                 │Input 1          │  │Input 2           │
                 └─────────────────┘  └──────────────────┘

Implementations

impl UnionExec

pub fn try_new( inputs: Vec<Arc<dyn ExecutionPlan>>, ) -> Result<Arc<dyn ExecutionPlan>>

Try to create a new UnionExec.

Errors

Returns an error if:

• inputs is empty

Optimization

If there is only one input, returns that input directly rather than wrapping it in a UnionExec

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

Get inputs of the execution plan

impl UnionExec

pub fn try_from_proto( node: &PhysicalPlanNode, ctx: &ExecutionPlanDecodeCtx<'_>, ) -> Result<Arc<dyn ExecutionPlan>>

Available on crate feature proto only.

Trait Implementations

impl Clone for UnionExec

fn clone(&self) -> UnionExec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UnionExec

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

Formats the value using the given formatter.

impl DisplayAs for UnionExec

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

Format according to DisplayFormatType, used when verbose representation looks different from the default one

impl ExecutionPlan for UnionExec

fn properties(&self) -> &Arc<PlanProperties>

Return a reference to Any that can be used for downcasting

fn try_swapping_with_projection( &self, projection: &ProjectionExec, ) -> Result<Option<Arc<dyn ExecutionPlan>>>

Tries to push projection down through union. If possible, performs the pushdown and returns a new UnionExec as the top plan which has projections as its children. Otherwise, returns None.

fn name(&self) -> &'static str

Short name for the ExecutionPlan, such as ‘DataSourceExec’.

fn check_invariants(&self, check: InvariantLevel) -> Result<()>

Returns an error if this individual node does not conform to its invariants. These invariants are typically only checked in debug mode.

fn maintains_input_order(&self) -> Vec<bool>

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

fn benefits_from_input_partitioning(&self) -> Vec<bool>

Specifies whether the ExecutionPlan benefits from increased parallelization at its input for each child.

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

Get a list of children ExecutionPlans that act as inputs to this plan. The returned list will be empty for leaf nodes such as scans, will contain a single value for unary nodes, or two values for binary nodes (such as joins).

fn apply_expressions( &self, _f: &mut dyn FnMut(&Arc<dyn PhysicalExpr>) -> Result<TreeNodeRecursion>, ) -> Result<TreeNodeRecursion>

Apply a closure f to each root expression that this node owns and uses during execution, either by evaluating it or updating it dynamically.

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

Returns a clone of the existing plan with the children replaced, skipping recomputation of plan properties when the options indicate the new children’s properties are unchanged.

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

👎Deprecated since 55.0.0:

Use ExecutionPlan::replace_children with ReplaceChildrenOptions

Deprecated.

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

👎Deprecated since 55.0.0:

Use ExecutionPlan::replace_children with ReplaceChildrenOptions

Deprecated. Implement ExecutionPlan::replace_children instead.

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

Begin execution of partition, returning a Stream of RecordBatches.

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

Return a snapshot of the set of Metrics for this ExecutionPlan. If no Metrics are available, return None.

fn child_stats_requests(&self, partition: Option<usize>) -> Vec<ChildStats>

Returns, per child, which statistics the StatisticsContext should resolve before calling Self::statistics_from_inputs.

fn statistics_from_inputs( &self, input_stats: &[Arc<Statistics>], args: &StatisticsArgs, ) -> Result<Arc<Statistics>>

Returns statistics for a specific partition of this ExecutionPlan node, given pre-computed child statistics.

fn cardinality_effect(&self) -> CardinalityEffect

Gets the effect on cardinality, if known

fn supports_limit_pushdown(&self) -> bool

Returns true if a limit can be safely pushed down through this ExecutionPlan node.

fn gather_filters_for_pushdown( &self, _phase: FilterPushdownPhase, parent_filters: Vec<Arc<dyn PhysicalExpr>>, _config: &ConfigOptions, ) -> Result<FilterDescription>

Collect filters that this node can push down to its children. Filters that are being pushed down from parents are passed in, and the node may generate additional filters to push down. For example, given the plan FilterExec -> HashJoinExec -> DataSourceExec, what will happen is that we recurse down the plan calling ExecutionPlan::gather_filters_for_pushdown:

fn handle_child_pushdown_result( &self, phase: FilterPushdownPhase, child_pushdown_result: ChildPushdownResult, _config: &ConfigOptions, ) -> Result<FilterPushdownPropagation<Arc<dyn ExecutionPlan>>>

Handle the result of a child pushdown.

fn try_to_proto( &self, ctx: &ExecutionPlanEncodeCtx<'_>, ) -> Result<Option<PhysicalPlanNode>>

Available on crate feature proto only.

Serialize this plan to its protobuf representation, if it knows how.

fn static_name() -> &'static str

where Self: Sized,

Short name for the ExecutionPlan, such as ‘DataSourceExec’. Like name but can be called without an instance.

fn downcast_delegate(&self) -> Option<&dyn ExecutionPlan>

Returns the plan that provides this plan’s public ExecutionPlan downcast identity.

fn schema(&self) -> SchemaRef

Get the schema for this execution plan

fn dynamic_expressions_produced(&self) -> Vec<Arc<dyn PhysicalExpr>>

Returns the dynamic expressions produced by this plan node.

fn required_input_distribution(&self) -> Vec<Distribution>

👎Deprecated since 55.0.0:

Use input_distribution_requirements

Specifies simple per-child input distribution requirements.

fn input_distribution_requirements(&self) -> InputDistributionRequirements

Specifies the input distribution requirements for this plan.

fn required_input_ordering(&self) -> Vec<Option<OrderingRequirements>>

Specifies the ordering required for all of the children of this ExecutionPlan.

fn reset_state(self: Arc<Self>) -> Result<Arc<dyn ExecutionPlan>>

Reset any internal state within this ExecutionPlan.

fn repartitioned( &self, _target_partitions: usize, _config: &ConfigOptions, ) -> Result<Option<Arc<dyn ExecutionPlan>>>

If supported, attempt to increase the partitioning of this ExecutionPlan to produce target_partitions partitions.

fn partition_statistics( &self, partition: Option<usize>, ) -> Result<Arc<Statistics>>

👎Deprecated since 55.0.0:

Use StatisticsContext::compute instead

Returns statistics for a specific partition of this ExecutionPlan node.

fn with_fetch(&self, _limit: Option<usize>) -> Option<Arc<dyn ExecutionPlan>>

Returns a fetching variant of this ExecutionPlan node, if it supports fetch limits. Returns None otherwise.

fn fetch(&self) -> Option<usize>

Gets the fetch count for the operator, None means there is no fetch.

fn with_new_state( &self, _state: Arc<dyn Any + Send + Sync>, ) -> Option<Arc<dyn ExecutionPlan>>

Injects arbitrary run-time state into this execution plan, returning a new plan instance that incorporates that state if it is relevant to the concrete node implementation.

fn try_pushdown_sort( &self, _order: &[PhysicalSortExpr], ) -> Result<SortOrderPushdownResult<Arc<dyn ExecutionPlan>>>

Try to push down sort ordering requirements to this node.

fn with_preserve_order( &self, _preserve_order: bool, ) -> Option<Arc<dyn ExecutionPlan>>

Returns a variant of this ExecutionPlan that is aware of order-sensitivity.