io.prestosql.sql.planner.optimizations.joins

Class JoinGraph

java.lang.Object

io.prestosql.sql.planner.optimizations.joins.JoinGraph

public class JoinGraph
extends Object

JoinGraph represents sequence of Joins, where nodes in the graph are PlanNodes that are being joined and edges are all equality join conditions between pair of nodes.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	JoinGraph.Edge

Constructor Summary

Constructors

Constructor and Description
JoinGraph(List<PlanNode> nodes, com.google.common.collect.Multimap<PlanNodeId,JoinGraph.Edge> edges, PlanNodeId rootId, List<Expression> filters, Optional<Map<Symbol,Expression>> assignments)
JoinGraph(PlanNode node)

Method Summary

Modifier and Type	Method and Description
static List<JoinGraph>	buildFrom(PlanNode plan) Builds all (distinct) JoinGraph-es whole plan tree.
static JoinGraph	buildShallowFrom(PlanNode plan, Lookup lookup) Builds JoinGraph containing plan node.
Optional<Map<Symbol,Expression>>	getAssignments()
Collection<JoinGraph.Edge>	getEdges(PlanNode node)
List<Expression>	getFilters()
PlanNode	getNode(int index)
List<PlanNode>	getNodes()
PlanNodeId	getRootId()
boolean	isEmpty()
int	size()
String	toString()
JoinGraph	withAssignments(Map<Symbol,Expression> assignments)
JoinGraph	withFilter(Expression expression)
JoinGraph	withRootId(PlanNodeId rootId)

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinGraph

public JoinGraph(PlanNode node)

JoinGraph

public JoinGraph(List<PlanNode> nodes,
                 com.google.common.collect.Multimap<PlanNodeId,JoinGraph.Edge> edges,
                 PlanNodeId rootId,
                 List<Expression> filters,
                 Optional<Map<Symbol,Expression>> assignments)

Method Detail

buildFrom

public static List<JoinGraph> buildFrom(PlanNode plan)

Builds all (distinct) JoinGraph-es whole plan tree.

buildShallowFrom

public static JoinGraph buildShallowFrom(PlanNode plan,
                                         Lookup lookup)

Builds JoinGraph containing plan node.

withAssignments

public JoinGraph withAssignments(Map<Symbol,Expression> assignments)

getAssignments

public Optional<Map<Symbol,Expression>> getAssignments()

withFilter

public JoinGraph withFilter(Expression expression)

getFilters

public List<Expression> getFilters()

getRootId

public PlanNodeId getRootId()

withRootId

public JoinGraph withRootId(PlanNodeId rootId)

isEmpty

public boolean isEmpty()

size

public int size()

getNode

public PlanNode getNode(int index)

getNodes

public List<PlanNode> getNodes()

getEdges

public Collection<JoinGraph.Edge> getEdges(PlanNode node)

toString

public String toString()

Overrides:

toString in class Object