Package io.prestosql.cost

Class CostCalculatorUsingExchanges

java.lang.Object

io.prestosql.cost.CostCalculatorUsingExchanges

All Implemented Interfaces:

CostCalculator

@ThreadSafe
public class CostCalculatorUsingExchanges
extends Object
implements CostCalculator

Simple implementation of CostCalculator. It assumes that ExchangeNodes are already in the plan.

Nested Class Summary

Nested classes/interfaces inherited from interface io.prestosql.cost.CostCalculator

CostCalculator.EstimatedExchanges

Constructor Summary

Constructors

Constructor	Description
CostCalculatorUsingExchanges(TaskCountEstimator taskCountEstimator)

Method Summary

Modifier and Type	Method	Description
PlanCostEstimate	calculateCost(PlanNode node, StatsProvider stats, CostProvider sourcesCosts, Session session, TypeProvider types)	Calculates cumulative cost of a node.

Methods inherited from class java.lang.Object

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

Constructor Detail

CostCalculatorUsingExchanges

@Inject
public CostCalculatorUsingExchanges(TaskCountEstimator taskCountEstimator)

Method Detail

calculateCost

public PlanCostEstimate calculateCost(PlanNode node,
                                      StatsProvider stats,
                                      CostProvider sourcesCosts,
                                      Session session,
                                      TypeProvider types)

Description copied from interface: CostCalculator

Calculates cumulative cost of a node.

Specified by:

calculateCost in interface CostCalculator

Parameters:

node - The node to compute cost for.

stats - The stats provider for node's stats and child nodes' stats, to be used if stats are needed to compute cost for the node