org.eigenbase.relopt.volcano
Class RelSubset.CheapestPlanReplacer

java.lang.Object
  org.eigenbase.rel.RelVisitor
      org.eigenbase.relopt.volcano.RelSubset.CheapestPlanReplacer

Enclosing class:

RelSubset

 class RelSubset.CheapestPlanReplacer
extends RelVisitor

Visitor which walks over a tree of RelSets, replacing each node with the cheapest implementation of the expression.

Field Summary

(package private) VolcanoPlanner

planner

Constructor Summary

RelSubset.CheapestPlanReplacer(VolcanoPlanner planner)

Method Summary

void	visit(RelNode p, int ordinal, RelNode parent) Visits a node during a traversal.

Methods inherited from class org.eigenbase.rel.RelVisitor

go, replaceRoot

Methods inherited from class java.lang.Object

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

Field Detail

planner

VolcanoPlanner planner

Constructor Detail

RelSubset.CheapestPlanReplacer

RelSubset.CheapestPlanReplacer(VolcanoPlanner planner)

Method Detail

visit

public void visit(RelNode p,
                  int ordinal,
                  RelNode parent)

Description copied from class: RelVisitor

Visits a node during a traversal.

Overrides:

visit in class RelVisitor

Parameters:

p - Node to visit

ordinal - Ordinal of node within its parent

parent - Parent of the node, or null if it is the root of the traversal