org.apache.tajo.plan.rewrite

Class BaseLogicalPlanRewriteEngine

java.lang.Object

org.apache.tajo.plan.rewrite.BaseLogicalPlanRewriteEngine

All Implemented Interfaces:

LogicalPlanRewriteEngine

public class BaseLogicalPlanRewriteEngine
extends Object
implements LogicalPlanRewriteEngine

This is a basic query rewrite rule engine. This rewrite rule engine rewrites a logical plan with various query rewrite rules.

Constructor Summary

Constructors

Constructor and Description
BaseLogicalPlanRewriteEngine()

Method Summary

Methods

Modifier and Type	Method and Description
void	addRewriteRule(Iterable<Class<? extends LogicalPlanRewriteRule>> rules) Add a query rewrite rule to this engine.
void	addRewriteRule(LogicalPlanRewriteRule rule) Add a query rewrite rule to this engine.
LogicalPlan	rewrite(OverridableConf queryContext, LogicalPlan plan) Rewrite a logical plan with all query rewrite rules added to this engine.

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseLogicalPlanRewriteEngine

public BaseLogicalPlanRewriteEngine()

Method Detail

addRewriteRule

public void addRewriteRule(Iterable<Class<? extends LogicalPlanRewriteRule>> rules)

Add a query rewrite rule to this engine.

Parameters:

rules - Rule classes

addRewriteRule

public void addRewriteRule(LogicalPlanRewriteRule rule)

Add a query rewrite rule to this engine.

Parameters:

rule - The rule to be added to this engine.

rewrite

public LogicalPlan rewrite(OverridableConf queryContext,
                  LogicalPlan plan)
                    throws PlanningException

Rewrite a logical plan with all query rewrite rules added to this engine.

Specified by:

rewrite in interface LogicalPlanRewriteEngine

Parameters:

plan - The plan to be rewritten with all query rewrite rule.

Returns:

The rewritten plan.

Throws:

PlanningException