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

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

All Implemented Interfaces:

OptimizerRule

public class RulePushLimit
extends java.lang.Object
implements OptimizerRule

Pushes limit nodes to their lowest points. This rule should only be run once. Should be run after all access nodes have been raised

Constructor Summary

RulePushLimit()

Method Summary

PlanNode	execute(PlanNode plan, QueryMetadataInterface metadata, CapabilitiesFinder capabilitiesFinder, RuleStack rules, AnalysisRecord analysisRecord, CommandContext context)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

RulePushLimit

public RulePushLimit()

Method Detail

execute

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

Specified by:

execute in interface OptimizerRule

Throws:

QueryPlannerException

QueryMetadataException

MetaMatrixComponentException

See Also:

OptimizerRule.execute(com.metamatrix.query.optimizer.relational.plantree.PlanNode, com.metamatrix.query.metadata.QueryMetadataInterface, com.metamatrix.query.optimizer.capabilities.CapabilitiesFinder, com.metamatrix.query.optimizer.relational.RuleStack, com.metamatrix.query.analysis.AnalysisRecord, com.metamatrix.query.util.CommandContext)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

See Also:

Object.toString()