org.eigenbase.relopt.volcano
Class VolcanoRuleCall

java.lang.Object
  org.eigenbase.relopt.RelOptRuleCall
      org.eigenbase.relopt.volcano.VolcanoRuleCall

Direct Known Subclasses:

VolcanoPlanner.DeferringRuleCall, VolcanoRuleMatch

public class VolcanoRuleCall
extends RelOptRuleCall

VolcanoRuleCall implements the RelOptRuleCall interface for VolcanoPlanner.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/relopt/volcano/VolcanoRuleCall.java#2 $

Author:

jhyde

Field Summary

private List<RelNode>	generatedRelList List of RelNode generated by this call.
protected VolcanoPlanner	volcanoPlanner

Fields inherited from class org.eigenbase.relopt.RelOptRuleCall

rels, tracer

Constructor Summary

(package private)	VolcanoRuleCall(VolcanoPlanner planner, RelOptRuleOperand operand) Creates a rule call.
protected	VolcanoRuleCall(VolcanoPlanner planner, RelOptRuleOperand operand, RelNode[] rels) Creates a rule call, internal, with array to hold bindings.

Method Summary

(package private) void	match(RelNode rel) Applies this rule, with a given relexp in the first slot.
private void	matchRecurse(int solve) Recursively matches operands above a given solve order.
protected void	onMatch() Called when all operands have matched.
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

volcanoPlanner

protected final VolcanoPlanner volcanoPlanner

generatedRelList

private List<RelNode> generatedRelList

List of RelNode generated by this call. For debugging purposes.

Constructor Detail

VolcanoRuleCall

protected VolcanoRuleCall(VolcanoPlanner planner,
                          RelOptRuleOperand operand,
                          RelNode[] rels)

Creates a rule call, internal, with array to hold bindings.

Parameters:

planner - Planner

operand - First operand of the rule

rels - Array which will hold the matched relational expressions

VolcanoRuleCall

VolcanoRuleCall(VolcanoPlanner planner,
                RelOptRuleOperand operand)

Creates a rule call.

Parameters:

planner - Planner

operand - First operand of the rule

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

onMatch

protected void onMatch()

Called when all operands have matched.

"Precondition:"

getRule().matches(this)

match

void match(RelNode rel)

Applies this rule, with a given relexp in the first slot.

"Precondition:"

operand0.matches(rel)

matchRecurse

private void matchRecurse(int solve)

Recursively matches operands above a given solve order.

Parameters:

solve - Solver order of operand

"Precondition:"

solve > 0, solve <= rule.operands.length