com.facebook.presto.spi.plan

Class PlanNode

java.lang.Object

com.facebook.presto.spi.plan.PlanNode

Direct Known Subclasses:

AggregationNode, DistinctLimitNode, FilterNode, LimitNode, MarkDistinctNode, ProjectNode, SetOperationNode, TableScanNode, TopNNode, ValuesNode

public abstract class PlanNode
extends Object

The basic component of a Presto IR (logic plan). An IR is a tree structure with each PlanNode performing a specific operation.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PlanNode(Optional<SourceLocation> sourceLocation, PlanNodeId id, Optional<PlanNode> statsEquivalentPlanNode)

Method Summary

Modifier and Type	Method and Description
<R,C> R	accept(PlanVisitor<R,C> visitor, C context) A visitor pattern interface to operate on IR.
abstract PlanNode	assignStatsEquivalentPlanNode(Optional<PlanNode> statsEquivalentPlanNode) Assigns statsEquivalentPlanNode to the plan node
LogicalProperties	computeLogicalProperties(LogicalPropertiesProvider logicalPropertiesProvider) Logical properties are a function of source properties and the operation performed by the plan node
PlanNodeId	getId()
abstract List<VariableReferenceExpression>	getOutputVariables() The output from the upstream PlanNodes.
Optional<SourceLocation>	getSourceLocation()
abstract List<PlanNode>	getSources() Get the upstream PlanNodes (i.e., children) of the current PlanNode.
Optional<PlanNode>	getStatsEquivalentPlanNode()
abstract PlanNode	replaceChildren(List<PlanNode> newChildren) Alter the upstream PlanNodes of the current PlanNode.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PlanNode

protected PlanNode(Optional<SourceLocation> sourceLocation,
                   PlanNodeId id,
                   Optional<PlanNode> statsEquivalentPlanNode)

Method Detail

getId

public PlanNodeId getId()

getSourceLocation

public Optional<SourceLocation> getSourceLocation()

getStatsEquivalentPlanNode

public Optional<PlanNode> getStatsEquivalentPlanNode()

getSources

public abstract List<PlanNode> getSources()

Get the upstream PlanNodes (i.e., children) of the current PlanNode.

computeLogicalProperties

public LogicalProperties computeLogicalProperties(LogicalPropertiesProvider logicalPropertiesProvider)

Logical properties are a function of source properties and the operation performed by the plan node

getOutputVariables

public abstract List<VariableReferenceExpression> getOutputVariables()

The output from the upstream PlanNodes. It should serve as the input for the current PlanNode.

replaceChildren

public abstract PlanNode replaceChildren(List<PlanNode> newChildren)

Alter the upstream PlanNodes of the current PlanNode.

accept

public <R,C> R accept(PlanVisitor<R,C> visitor,
                      C context)

A visitor pattern interface to operate on IR.

assignStatsEquivalentPlanNode

public abstract PlanNode assignStatsEquivalentPlanNode(Optional<PlanNode> statsEquivalentPlanNode)

Assigns statsEquivalentPlanNode to the plan node