com.bigdata.bop.joinGraph.rto

Class VertexSample

java.lang.Object

com.bigdata.bop.joinGraph.rto.SampleBase

com.bigdata.bop.joinGraph.rto.VertexSample

public class VertexSample
extends SampleBase

A sample of a Vertex (an access path).

Field Summary

Fields inherited from class com.bigdata.bop.joinGraph.rto.SampleBase

estCard, estimateEnum, limit

Constructor Summary

Constructors

Constructor and Description
VertexSample(long estCard, int limit, EstimateEnum estimateEnum, IBindingSet[] sample) Note: For a Vertex, the estimatedCardinality is the fast range count.

Method Summary

Methods inherited from class com.bigdata.bop.joinGraph.rto.SampleBase

getSample, isExact, isUnderflow, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

VertexSample

public VertexSample(long estCard,
            int limit,
            EstimateEnum estimateEnum,
            IBindingSet[] sample)

Note: For a Vertex, the estimatedCardinality is the fast range count. This will be the same for each sample taken (assuming a read historical view or even a time scale of query which is significantly faster than update).

Parameters:

estCard - The estimated cardinality.

limit - The cutoff limit used to make that cardinality estimate.

estimateEnum - The type of estimate. For a vertex this should be EstimateEnum.Exact iff the sample is the fully materialized access path for that vertex and otherwise EstimateEnum.Normal.

sample - The sample.