org.eigenbase.rel.metadata
Class RelMdRowCount

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

All Implemented Interfaces:

RelMetadataProvider, ReflectiveVisitor

public class RelMdRowCount
extends ReflectiveRelMetadataProvider

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

Version:

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

Author:

Zelaine Fong

Constructor Summary

RelMdRowCount()

Method Summary

Double	getRowCount(AggregateRelBase rel)
Double	getRowCount(FilterRelBase rel)
Double	getRowCount(ProjectRelBase rel)
Double	getRowCount(RelNode rel)
Double	getRowCount(SemiJoinRel rel)
Double	getRowCount(SortRel rel)
Double	getRowCount(UnionRelBase rel)

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

RelMdRowCount

public RelMdRowCount()

Method Detail

getRowCount

public Double getRowCount(UnionRelBase rel)

getRowCount

public Double getRowCount(FilterRelBase rel)

getRowCount

public Double getRowCount(ProjectRelBase rel)

getRowCount

public Double getRowCount(SortRel rel)

getRowCount

public Double getRowCount(SemiJoinRel rel)

getRowCount

public Double getRowCount(AggregateRelBase rel)

getRowCount

public Double getRowCount(RelNode rel)