org.apache.flink.optimizer.traversals

Class BinaryUnionReplacer

java.lang.Object

org.apache.flink.optimizer.traversals.BinaryUnionReplacer

All Implemented Interfaces:

Visitor<PlanNode>

public class BinaryUnionReplacer
extends Object
implements Visitor<PlanNode>

A traversal that collects cascading binary unions into a single n-ary union operator. The exception is, when on of the union inputs is materialized, such as in the static-code-path-cache in iterations.

Constructor Summary

Constructors

Constructor and Description
BinaryUnionReplacer()

Method Summary

Modifier and Type	Method and Description
void	collect(Channel in, List<Channel> inputs)
void	postVisit(PlanNode visitable) Method that is invoked after all child nodes or descendant nodes were visited.
boolean	preVisit(PlanNode visitable) Method that is invoked on the visit before visiting and child nodes or descendant nodes.

Methods inherited from class java.lang.Object

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

Constructor Detail

BinaryUnionReplacer

public BinaryUnionReplacer()

Method Detail

preVisit

public boolean preVisit(PlanNode visitable)

Description copied from interface: Visitor

Method that is invoked on the visit before visiting and child nodes or descendant nodes.

Specified by:

preVisit in interface Visitor<PlanNode>

Returns:

True, if the traversal should continue, false otherwise.

postVisit

public void postVisit(PlanNode visitable)

Description copied from interface: Visitor

Method that is invoked after all child nodes or descendant nodes were visited.

Specified by:

postVisit in interface Visitor<PlanNode>

collect

public void collect(Channel in,
                    List<Channel> inputs)