org.apache.flink.optimizer.traversals

Class BranchesVisitor

java.lang.Object

org.apache.flink.optimizer.traversals.BranchesVisitor

All Implemented Interfaces:

org.apache.flink.util.Visitor<OptimizerNode>

public final class BranchesVisitor
extends Object
implements org.apache.flink.util.Visitor<OptimizerNode>

This traversal of the optimizer DAG computes the information needed to track branches and joins in the data flow. This is important to support plans that are not a minimally connected DAG (Such plans are not trees, but at least one node feeds its output into more than one other node).

Constructor Summary

Constructors

Constructor and Description
BranchesVisitor()

Method Summary

Modifier and Type	Method and Description
void	postVisit(OptimizerNode node)
boolean	preVisit(OptimizerNode node)

Methods inherited from class java.lang.Object

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

Constructor Detail

BranchesVisitor

public BranchesVisitor()

Method Detail

preVisit

public boolean preVisit(OptimizerNode node)

Specified by:

preVisit in interface org.apache.flink.util.Visitor<OptimizerNode>

postVisit

public void postVisit(OptimizerNode node)

Specified by:

postVisit in interface org.apache.flink.util.Visitor<OptimizerNode>