org.eigenbase.rel.metadata
Class RelMdSelectivity

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

All Implemented Interfaces:

RelMetadataProvider, ReflectiveVisitor

public class RelMdSelectivity
extends ReflectiveRelMetadataProvider

RelMdSelectivity supplies a default implementation of RelMetadataQuery.getSelectivity(org.eigenbase.rel.RelNode, org.eigenbase.rex.RexNode) for the standard logical algebra.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/metadata/RelMdSelectivity.java#9 $

Author:

Zelaine Fong

Constructor Summary

RelMdSelectivity()

Method Summary

Double	getSelectivity(AggregateRelBase rel, RexNode predicate)
Double	getSelectivity(FilterRelBase rel, RexNode predicate)
Double	getSelectivity(ProjectRelBase rel, RexNode predicate)
Double	getSelectivity(RelNode rel, RexNode predicate)
Double	getSelectivity(SemiJoinRel rel, RexNode predicate)
Double	getSelectivity(SortRel rel, RexNode predicate)
Double	getSelectivity(UnionRelBase rel, RexNode predicate)

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

RelMdSelectivity

public RelMdSelectivity()

Method Detail

getSelectivity

public Double getSelectivity(UnionRelBase rel,
                             RexNode predicate)

getSelectivity

public Double getSelectivity(SortRel rel,
                             RexNode predicate)

getSelectivity

public Double getSelectivity(FilterRelBase rel,
                             RexNode predicate)

getSelectivity

public Double getSelectivity(SemiJoinRel rel,
                             RexNode predicate)

getSelectivity

public Double getSelectivity(AggregateRelBase rel,
                             RexNode predicate)

getSelectivity

public Double getSelectivity(ProjectRelBase rel,
                             RexNode predicate)

getSelectivity

public Double getSelectivity(RelNode rel,
                             RexNode predicate)