org.modeshape.jcr.query.optimize

Class JoinOrder

java.lang.Object

org.modeshape.jcr.query.optimize.JoinOrder

All Implemented Interfaces:

OptimizerRule

public class JoinOrder
extends Object
implements OptimizerRule

An optimization rule that ensure that the order of the left and right side of a JOIN match certain join criteria, including DescendantNodeJoinCondition and ChildNodeJoinCondition.

Field Summary

Fields

Modifier and Type	Field and Description
static JoinOrder	INSTANCE

Constructor Summary

Constructors

Constructor and Description
JoinOrder()

Method Summary

Methods

Modifier and Type	Method and Description
PlanNode	execute(QueryContext context, PlanNode plan, LinkedList<OptimizerRule> ruleStack) Optimize the supplied plan using the supplied context, hints, and yet-to-be-run rules.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final JoinOrder INSTANCE

Constructor Detail

JoinOrder

public JoinOrder()

Method Detail

execute

public PlanNode execute(QueryContext context,
               PlanNode plan,
               LinkedList<OptimizerRule> ruleStack)

Description copied from interface: OptimizerRule

Optimize the supplied plan using the supplied context, hints, and yet-to-be-run rules.

Specified by:

execute in interface OptimizerRule

Parameters:

context - the context in which the query is being optimized; never null

plan - the plan to be optimized; never null

ruleStack - the stack of rules that will be run after this rule; never null

Returns:

the optimized plan; never null