Package org.apache.calcite.rel.metadata

Class MetadataFactoryImpl

java.lang.Object

org.apache.calcite.rel.metadata.MetadataFactoryImpl

All Implemented Interfaces:

MetadataFactory

@Deprecated
public class MetadataFactoryImpl
extends Object
implements MetadataFactory

Deprecated.

Use RelMetadataQuery.

Implementation of MetadataFactory that gets providers from a RelMetadataProvider and stores them in a cache.

The cache does not store metadata. It remembers which providers can provide which kinds of metadata, for which kinds of relational expressions.

Field Summary

Fields

Modifier and Type	Field	Description
static final UnboundMetadata<@Nullable Metadata>	DUMMY	Deprecated.

Constructor Summary

Constructors

Constructor	Description
MetadataFactoryImpl(RelMetadataProvider provider)	Deprecated.

Method Summary

Modifier and Type	Method	Description
<@Nullable M extends @Nullable Metadata> M	query(RelNode rel, RelMetadataQuery mq, Class<@Nullable M> metadataClazz)	Deprecated. Returns a metadata interface to get a particular kind of metadata from a particular relational expression.

Methods inherited from class java.lang.Object

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

Field Details

DUMMY

public static final UnboundMetadata<@Nullable Metadata> DUMMY

Deprecated.

Constructor Details

MetadataFactoryImpl

public MetadataFactoryImpl(RelMetadataProvider provider)

Deprecated.

Method Details

query

public <@Nullable M extends @Nullable Metadata> M query(RelNode rel,
 RelMetadataQuery mq,
 Class<@Nullable M> metadataClazz)

Deprecated.

Description copied from interface: MetadataFactory

Returns a metadata interface to get a particular kind of metadata from a particular relational expression. Returns null if that kind of metadata is not available.

Specified by:

query in interface MetadataFactory

Type Parameters:

M - Metadata type

Parameters:

rel - Relational expression

mq - Metadata query

metadataClazz - Metadata class

Returns:

Metadata bound to rel and query