Package org.apache.calcite.rel.metadata

Class DefaultRelMetadataProvider

java.lang.Object

org.apache.calcite.rel.metadata.ChainedRelMetadataProvider

org.apache.calcite.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.

Field Summary

Fields

Modifier and Type	Field	Description
static final DefaultRelMetadataProvider	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DefaultRelMetadataProvider()	Creates a new default provider.

Method Summary

Methods inherited from class org.apache.calcite.rel.metadata.ChainedRelMetadataProvider

apply, equals, handlers, handlers, hashCode, of

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final DefaultRelMetadataProvider INSTANCE

Constructor Details

DefaultRelMetadataProvider

protected 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.

Use this constructor only from a sub-class. Otherwise use the singleton instance, INSTANCE.