org.tikv.common.predicates

Class SelectivityCalculator

java.lang.Object

org.tikv.common.expression.Visitor<R,C>

org.tikv.common.expression.visitor.DefaultVisitor<Double,Void>

org.tikv.common.predicates.SelectivityCalculator

public class SelectivityCalculator
extends DefaultVisitor<Double,Void>

Constructor Summary

Constructors

Constructor and Description
SelectivityCalculator()

Method Summary

Modifier and Type	Method and Description
static double	calcPseudoSelectivity(ScanSpec spec)
protected Double	process(Expression node, Void context)

Methods inherited from class org.tikv.common.expression.visitor.DefaultVisitor

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectivityCalculator

public SelectivityCalculator()

Method Detail

calcPseudoSelectivity

public static double calcPseudoSelectivity(ScanSpec spec)

process

protected Double process(Expression node,
                         Void context)

Overrides:

process in class DefaultVisitor<Double,Void>