uk.org.ogsadai.dqp.lqp.optimiser
Interface Optimiser

All Known Implementing Classes:

BatchTableScanOptimiser, CardinalityEstimatorOptimiser, DecorrelationOptimiser, ExtendedTableScanImplosionOptimiser, FailOptimiser, FilteredTableScanOptimiser, InsertProjectAfterGroupByOptimiser, JoinAnnotation, JoinOrderingOptimiser, OrderedMergeJoinOptimiser, OrderedSweepJoinOptimiser, PartitioningOptimiser, ProjectPullUpOptimiser, ProjectPushDownOptimiser, QueryNormaliser, RangeJoinOptimiser, RemoveRedundantProjectOptimiser, RenamePullUpOptimiser, SelectPushDownOptimiser, StatisticsCardinalityEstimationOptimiser, TableScanImplosionOptimiser, VisualiseOptimiser

public interface Optimiser

Optimiser interface.

Author:

The OGSA-DAI Project Team.

Method Summary

Operator

optimise(Operator lqpRoot, RequestDQPFederation requestFederation, CompilerConfiguration compilerConfiguration, RequestDetails requestDetails) Transforms a query plan.

Method Detail

optimise

Operator optimise(Operator lqpRoot,
                  RequestDQPFederation requestFederation,
                  CompilerConfiguration compilerConfiguration,
                  RequestDetails requestDetails)
                  throws LQPException

Transforms a query plan.

Parameters:

lqpRoot - logical query plan root

requestFederation - request specific DQP federation

compilerConfiguration - compiler configuration

requestDetails - details relating to the request.

Returns:

transformed LQP

Throws:

LQPException