Package se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.utils

Class CardinalityEstimationUtils

java.lang.Object

se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.utils.CardinalityEstimationUtils

public class CardinalityEstimationUtils
extends Object

Constructor Summary

Constructors

Constructor	Description
CardinalityEstimationUtils()

Method Summary

Modifier and Type	Method	Description
static Integer[]	getEstimates(CardinalityEstimation cardEstimate, List<PhysicalPlan> plans)	Initiates the cardinality estimation processes for all the plans in the given list and, afterwards, waits for the resulting estimates and returns them.
static Integer[]	getEstimates(CardinalityEstimation cardEstimate, PhysicalPlan... plans)	Initiates the cardinality estimation processes for all the given plans and, afterwards, waits for the resulting estimates and returns them.

Methods inherited from class java.lang.Object

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

Constructor Details

CardinalityEstimationUtils

public CardinalityEstimationUtils()

Method Details

getEstimates

public static Integer[] getEstimates(CardinalityEstimation cardEstimate,
 PhysicalPlan... plans)
                              throws CardinalityEstimationException

Initiates the cardinality estimation processes for all the given plans and, afterwards, waits for the resulting estimates and returns them. The returned array contains as many values as plans are given to this function, where the i-th value is for the i-th plan that is given. Note that calls of this function are synchronous; that is, they return only after the cardinality estimation processes have completed and the estimates have been determined. For asynchronous functions, use the given CardinalityEstimation directly.

Throws:

CardinalityEstimationException

getEstimates

public static Integer[] getEstimates(CardinalityEstimation cardEstimate,
 List<PhysicalPlan> plans)
                              throws CardinalityEstimationException

Initiates the cardinality estimation processes for all the plans in the given list and, afterwards, waits for the resulting estimates and returns them. The returned array contains as many values as there are plans in the given list, where the i-th value in the array is for the i-th plan in the given list. Note that calls of this function are synchronous; that is, they return only after the cardinality estimation processes have completed and the estimates have been determined. For asynchronous functions, use the given CardinalityEstimation directly.

Throws:

CardinalityEstimationException