com.bigdata.bop.joinGraph

Class NoReorderEvaluationPlan

java.lang.Object

com.bigdata.bop.joinGraph.NoReorderEvaluationPlan

All Implemented Interfaces:

IEvaluationPlan

public class NoReorderEvaluationPlan
extends Object
implements IEvaluationPlan

Useful for testing - will not reorder the join predicates.

Author:

mike

Field Summary

Fields

Modifier and Type	Field and Description
protected IJoinNexus	joinNexus
protected int[]	order
protected long[]	rangeCount
protected IRule	rule

Constructor Summary

Constructors

Constructor and Description
NoReorderEvaluationPlan(IJoinNexus joinNexus, IRule rule)

Method Summary

Methods

Modifier and Type	Method and Description
int[]	getOrder() Return the evaluation order.
boolean	isEmpty() true iff the IRule was proven to be empty based on range counts or other data.
long	rangeCount(int tailIndex) The range count for the predicate.

Methods inherited from class java.lang.Object

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

Field Detail

joinNexus

protected final IJoinNexus joinNexus

rule

protected final IRule rule

rangeCount

protected final long[] rangeCount

order

protected final int[] order

Constructor Detail

NoReorderEvaluationPlan

public NoReorderEvaluationPlan(IJoinNexus joinNexus,
                       IRule rule)

Method Detail

getOrder

public int[] getOrder()

Description copied from interface: IEvaluationPlan

Return the evaluation order.

Specified by:

getOrder in interface IEvaluationPlan

Returns:

The evaluation order. This is an array of indices into the predicates in the tail of the rule. Each tail predicate must be used exactly once. The elements in this array are the order in which each tail predicate will be evaluated. The index into the array is the index of the tail predicate whose evaluation order you want. So [2,0,1] says that the predicates will be evaluated in the order tail[2], then tail[0], then tail[1].

isEmpty

public boolean isEmpty()

Description copied from interface: IEvaluationPlan

true iff the IRule was proven to be empty based on range counts or other data.

Specified by:

isEmpty in interface IEvaluationPlan

rangeCount

public long rangeCount(int tailIndex)

Description copied from interface: IEvaluationPlan

The range count for the predicate.

Specified by:

rangeCount in interface IEvaluationPlan

Parameters:

tailIndex - The index of the predicate in the tail of the rule.

Returns:

The range count for that predicate.

See Also:

IRangeCountFactory