org.eigenbase.rel.metadata
Class DefaultRelMetadataProvider

java.lang.Object
  org.eigenbase.rel.metadata.ChainedRelMetadataProvider
      org.eigenbase.rel.metadata.DefaultRelMetadataProvider

All Implemented Interfaces:

RelMetadataProvider

public class DefaultRelMetadataProvider
extends ChainedRelMetadataProvider

DefaultRelMetadataProvider supplies a default implementation of the RelMetadataProvider interface. It provides generic formulas and derivation rules for the standard logical algebra; coverage corresponds to the methods declared in RelMetadataQuery.

Version:

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

Author:

John V. Sichi

Constructor Summary

DefaultRelMetadataProvider()
Creates a new default provider.

Method Summary

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

addProvider, getRelMetadata

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultRelMetadataProvider

public DefaultRelMetadataProvider()

Creates a new default provider. This provider defines "catch-all" handlers for generic RelNodes, so it should always be given lowest priority when chaining.