simpledb.parallel

Class ParallelQueryPlanOptimizer

java.lang.Object

simpledb.parallel.ParallelQueryPlanOptimizer

Direct Known Subclasses:

AggregateOptimizer, BloomFilterOptimizer, FilterOptimizer, ProjectOptimizer

public abstract class ParallelQueryPlanOptimizer
extends java.lang.Object

Parallel query plan optimizer super class. All the parallel query plan optimizers should be inherited from this class. Given input a parallel query plan, the output is the optimized parallel query plan Note that the input query plan and the output query should both valid, i.e. can be directly used for running. This is required so that we can chain a set of optimizers.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) ParallelQueryPlanOptimizer	next

Constructor Summary

Constructors

Constructor and Description
ParallelQueryPlanOptimizer()
ParallelQueryPlanOptimizer(ParallelQueryPlanOptimizer next)

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract void	doMyOptimization(TransactionId tid, ParallelQueryPlan plan) Sub classes should implement this method to do the actual optimization
ParallelQueryPlan	optimize(TransactionId tid, ParallelQueryPlan plan) Do the optimization

Methods inherited from class java.lang.Object

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

Field Detail

next

ParallelQueryPlanOptimizer next

Constructor Detail

ParallelQueryPlanOptimizer

public ParallelQueryPlanOptimizer()

ParallelQueryPlanOptimizer

public ParallelQueryPlanOptimizer(ParallelQueryPlanOptimizer next)

Parameters:

next - The next optimizer. The output of this optimizer will be fed as the input to the next optimizer.

Method Detail

optimize

public final ParallelQueryPlan optimize(TransactionId tid,
                         ParallelQueryPlan plan)

Do the optimization

Parameters:

tid - TransactionId of the query

plan - The plan to be optimized

optimizedBy - Keep the record of what optimizations have been conducted on the query

doMyOptimization

protected abstract void doMyOptimization(TransactionId tid,
                    ParallelQueryPlan plan)

Sub classes should implement this method to do the actual optimization