org.eigenbase.relopt
Class RelTraitPropagationVisitor

java.lang.Object
  org.eigenbase.rel.RelVisitor
      org.eigenbase.relopt.RelTraitPropagationVisitor

public class RelTraitPropagationVisitor
extends RelVisitor

RelTraitPropagationVisitor traverses a RelNode and its unregistered children, making sure that each has a full complement of traits. When a RelNode is found to be missing one or more traits, they are copied from a RelTraitSet given during construction.

Author:

Stephan Zuercher

Field Summary

private RelTraitSet	baseTraits
private RelOptPlanner	planner

Constructor Summary

RelTraitPropagationVisitor(RelOptPlanner planner, RelTraitSet baseTraits)

Method Summary

void	visit(RelNode rel, 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

baseTraits

private final RelTraitSet baseTraits

planner

private final RelOptPlanner planner

Constructor Detail

RelTraitPropagationVisitor

public RelTraitPropagationVisitor(RelOptPlanner planner,
                                  RelTraitSet baseTraits)

Method Detail

visit

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

Description copied from class: RelVisitor

Visits a node during a traversal.

Overrides:

visit in class RelVisitor

Parameters:

rel - 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