com.metamatrix.query.optimizer.relational.rules
Class RulePushNonJoinCriteria

java.lang.Object
  com.metamatrix.query.optimizer.relational.rules.RulePushNonJoinCriteria

All Implemented Interfaces:

OptimizerRule

public final class RulePushNonJoinCriteria
extends java.lang.Object
implements OptimizerRule

Pushes on criteria out of the on clause if possible. If the join no longer contains criteria, it will be changed into a cross join. Upon a successful push, RulePushSelectCriteria will be run again.

Constructor Summary

RulePushNonJoinCriteria()

Method Summary

PlanNode	execute(PlanNode plan, QueryMetadataInterface metadata, CapabilitiesFinder capFinder, RuleStack rules, AnalysisRecord analysisRecord, CommandContext context) Execute the rule as described in the class comments.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

RulePushNonJoinCriteria

public RulePushNonJoinCriteria()

Method Detail

execute

public PlanNode execute(PlanNode plan,
                        QueryMetadataInterface metadata,
                        CapabilitiesFinder capFinder,
                        RuleStack rules,
                        AnalysisRecord analysisRecord,
                        CommandContext context)
                 throws QueryPlannerException,
                        QueryMetadataException,
                        MetaMatrixComponentException

Execute the rule as described in the class comments.

Specified by:

execute in interface OptimizerRule

Parameters:

plan - Incoming query plan, may be modified during method and may be returned from method

metadata - Metadata source

rules - Rules from optimizer rule stack, may be manipulated during method

Returns:

Updated query plan if rule fired, else original query plan

Throws:

QueryPlannerException

QueryMetadataException

MetaMatrixComponentException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object