Package io.trino.cost

Class CostCalculatorWithEstimatedExchanges

java.lang.Object

io.trino.cost.CostCalculatorWithEstimatedExchanges

All Implemented Interfaces:

CostCalculator

@ThreadSafe
public class CostCalculatorWithEstimatedExchanges
extends Object
implements CostCalculator

A wrapper around CostCalculator that estimates ExchangeNodes cost.

Certain rules (e.g. ReorderJoins and DetermineJoinDistributionType) are run before exchanges are added to a plan. This cost calculator adds the implied costs for the exchanges that will be added later. It is needed to account for the differences in exchange costs for different types of joins.

Nested Class Summary

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

CostCalculator.EstimatedExchanges

Constructor Summary

Constructors

Constructor	Description
CostCalculatorWithEstimatedExchanges(CostCalculator costCalculator, TaskCountEstimator taskCountEstimator)

Method Summary

Modifier and Type	Method	Description
static LocalCostEstimate	adjustReplicatedJoinLocalExchangeCost(PlanNode build, StatsProvider stats, boolean replicated, int estimatedSourceDistributedTaskCount)
PlanCostEstimate	calculateCost(PlanNode node, StatsProvider stats, CostProvider sourcesCosts, Session session)	Calculates cumulative cost of a node.
static LocalCostEstimate	calculateJoinCostWithoutOutput(PlanNode probe, PlanNode build, StatsProvider stats, boolean replicated, int estimatedSourceDistributedTaskCount)
static LocalCostEstimate	calculateJoinInputCost(PlanNode probe, PlanNode build, StatsProvider stats, boolean replicated, int estimatedSourceDistributedTaskCount)
static LocalCostEstimate	calculateLocalRepartitionCost(double inputSizeInBytes)
static LocalCostEstimate	calculateRemoteGatherCost(double inputSizeInBytes)
static LocalCostEstimate	calculateRemoteRepartitionCost(double inputSizeInBytes)
static LocalCostEstimate	calculateRemoteReplicateCost(double inputSizeInBytes, int destinationTaskCount)

Methods inherited from class java.lang.Object

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

Constructor Details

CostCalculatorWithEstimatedExchanges

@Inject
public CostCalculatorWithEstimatedExchanges(CostCalculator costCalculator,
 TaskCountEstimator taskCountEstimator)

Method Details

calculateCost

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

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

calculateRemoteGatherCost

public static LocalCostEstimate calculateRemoteGatherCost(double inputSizeInBytes)

calculateRemoteRepartitionCost

public static LocalCostEstimate calculateRemoteRepartitionCost(double inputSizeInBytes)

calculateLocalRepartitionCost

public static LocalCostEstimate calculateLocalRepartitionCost(double inputSizeInBytes)

calculateRemoteReplicateCost

public static LocalCostEstimate calculateRemoteReplicateCost(double inputSizeInBytes,
 int destinationTaskCount)

calculateJoinCostWithoutOutput

public static LocalCostEstimate calculateJoinCostWithoutOutput(PlanNode probe,
 PlanNode build,
 StatsProvider stats,
 boolean replicated,
 int estimatedSourceDistributedTaskCount)

adjustReplicatedJoinLocalExchangeCost

public static LocalCostEstimate adjustReplicatedJoinLocalExchangeCost(PlanNode build,
 StatsProvider stats,
 boolean replicated,
 int estimatedSourceDistributedTaskCount)

calculateJoinInputCost

public static LocalCostEstimate calculateJoinInputCost(PlanNode probe,
 PlanNode build,
 StatsProvider stats,
 boolean replicated,
 int estimatedSourceDistributedTaskCount)