org.eigenbase.rel.metadata
Class RelMdPercentageOriginalRows

java.lang.Object
  org.eigenbase.rel.metadata.ReflectiveRelMetadataProvider
      org.eigenbase.rel.metadata.RelMdPercentageOriginalRows

All Implemented Interfaces:

RelMetadataProvider, ReflectiveVisitor

public class RelMdPercentageOriginalRows
extends ReflectiveRelMetadataProvider

RelMdPercentageOriginalRows supplies a default implementation of RelMetadataQuery.getPercentageOriginalRows(org.eigenbase.rel.RelNode) for the standard logical algebra.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/metadata/RelMdPercentageOriginalRows.java#8 $

Author:

John V. Sichi

Constructor Summary

RelMdPercentageOriginalRows()

Method Summary

RelOptCost	getCumulativeCost(RelNode rel)
RelOptCost	getNonCumulativeCost(RelNode rel)
Double	getPercentageOriginalRows(AggregateRelBase rel)
Double	getPercentageOriginalRows(JoinRelBase rel)
Double	getPercentageOriginalRows(RelNode rel)
Double	getPercentageOriginalRows(UnionRelBase rel)
private static Double	quotientForPercentage(Double numerator, Double denominator)

Methods inherited from class org.eigenbase.rel.metadata.ReflectiveRelMetadataProvider

getRelMetadata, mapParameterTypes

Methods inherited from class java.lang.Object

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

Constructor Detail

RelMdPercentageOriginalRows

public RelMdPercentageOriginalRows()

Method Detail

getPercentageOriginalRows

public Double getPercentageOriginalRows(AggregateRelBase rel)

getPercentageOriginalRows

public Double getPercentageOriginalRows(UnionRelBase rel)

getPercentageOriginalRows

public Double getPercentageOriginalRows(JoinRelBase rel)

getPercentageOriginalRows

public Double getPercentageOriginalRows(RelNode rel)

getCumulativeCost

public RelOptCost getCumulativeCost(RelNode rel)

getNonCumulativeCost

public RelOptCost getNonCumulativeCost(RelNode rel)

quotientForPercentage

private static Double quotientForPercentage(Double numerator,
                                            Double denominator)