org.eigenbase.relopt.hep
Class HepRuleCall

java.lang.Object
  org.eigenbase.relopt.RelOptRuleCall
      org.eigenbase.relopt.hep.HepRuleCall

public class HepRuleCall
extends RelOptRuleCall

HepRuleCall implements RelOptRuleCall for a HepPlanner. It remembers transformation results so that the planner can choose which one (if any) should replace the original expression.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/relopt/hep/HepRuleCall.java#9 $

Author:

John V. Sichi

Field Summary

private List<RelNode>

results

Fields inherited from class org.eigenbase.relopt.RelOptRuleCall

rels, tracer

Constructor Summary

HepRuleCall(RelOptPlanner planner, RelOptRuleOperand operand, RelNode[] rels, Map<RelNode,List<RelNode>> nodeChildren, List<RelNode> parents)

Method Summary

(package private) List<RelNode>	getResults()
void	transformTo(RelNode rel) Called by the rule whenever it finds a match.

Methods inherited from class org.eigenbase.relopt.RelOptRuleCall

getChildRels, getOperand0, getParents, getPlanner, getRels, getRule

Methods inherited from class java.lang.Object

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

Field Detail

results

private List<RelNode> results

Constructor Detail

HepRuleCall

HepRuleCall(RelOptPlanner planner,
            RelOptRuleOperand operand,
            RelNode[] rels,
            Map<RelNode,List<RelNode>> nodeChildren,
            List<RelNode> parents)

Method Detail

transformTo

public void transformTo(RelNode rel)

Description copied from class: RelOptRuleCall

Called by the rule whenever it finds a match. The implementation of this method will guarantee that the original relational expression (e.g., this.rels[0]) has its traits propagated to the new relational expression (rel) and its unregistered children. Any trait not specifically set in the RelTraitSet returned by rel.getTraits() will be copied from this.rels[0].getTraitSet().

Specified by:

transformTo in class RelOptRuleCall

getResults

List<RelNode> getResults()