Package io.prestosql.cost

Class PlanCostEstimate

java.lang.Object

io.prestosql.cost.PlanCostEstimate

public final class PlanCostEstimate
extends Object

Constructor Summary

Constructors

Constructor	Description
PlanCostEstimate(double cpuCost, double maxMemory, double maxMemoryWhenOutputting, double networkCost)
PlanCostEstimate(double cpuCost, double maxMemory, double maxMemoryWhenOutputting, double networkCost, LocalCostEstimate rootNodeLocalCostEstimate)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
double	getCpuCost()	Returns CPU component of the cost.
double	getMaxMemory()	Returns maximal memory usage of a query plan (or subplan).
double	getMaxMemoryWhenOutputting()	Returns maximal memory usage of a query plan (or subplan) after a first output row was produced.
double	getNetworkCost()	Returns network component of the cost.
LocalCostEstimate	getRootNodeLocalCostEstimate()	Returns local cost estimate for the root plan node.
int	hashCode()
boolean	hasUnknownComponents()	Returns true if this cost has unknown components.
static PlanCostEstimate	infinite()
String	toString()
static PlanCostEstimate	unknown()
static PlanCostEstimate	zero()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

PlanCostEstimate

public PlanCostEstimate(double cpuCost,
                        double maxMemory,
                        double maxMemoryWhenOutputting,
                        double networkCost)

PlanCostEstimate

public PlanCostEstimate(double cpuCost,
                        double maxMemory,
                        double maxMemoryWhenOutputting,
                        double networkCost,
                        LocalCostEstimate rootNodeLocalCostEstimate)

Method Detail

infinite

public static PlanCostEstimate infinite()

unknown

public static PlanCostEstimate unknown()

zero

public static PlanCostEstimate zero()

getCpuCost

public double getCpuCost()

Returns CPU component of the cost.

Unknown value is represented by Double.NaN

getMaxMemory

public double getMaxMemory()

Returns maximal memory usage of a query plan (or subplan).

Unknown value is represented by Double.NaN

getMaxMemoryWhenOutputting

public double getMaxMemoryWhenOutputting()

Returns maximal memory usage of a query plan (or subplan) after a first output row was produced. When this cost represents a cost of a subplan, this information can be used to determine maximum memory usage (and maximum memory usage after a first output row was produced) for plan nodes higher up in the plan tree.

Unknown value is represented by Double.NaN.

getNetworkCost

public double getNetworkCost()

Returns network component of the cost.

Unknown value is represented by Double.NaN

getRootNodeLocalCostEstimate

public LocalCostEstimate getRootNodeLocalCostEstimate()

Returns local cost estimate for the root plan node.

hasUnknownComponents

public boolean hasUnknownComponents()

Returns true if this cost has unknown components.

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object