org.apache.calcite.rel.metadata

Class JaninoRelMetadataProvider

java.lang.Object

org.apache.calcite.rel.metadata.JaninoRelMetadataProvider

All Implemented Interfaces:

MetadataHandlerProvider, RelMetadataProvider

public class JaninoRelMetadataProvider
extends Object
implements RelMetadataProvider, MetadataHandlerProvider

Implementation of the RelMetadataProvider interface that generates a class that dispatches to the underlying providers.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	JaninoRelMetadataProvider.NoHandler Deprecated.

Field Summary

Fields

Modifier and Type	Field and Description
static JaninoRelMetadataProvider	DEFAULT

Method Summary

Modifier and Type	Method and Description
<M extends Metadata> UnboundMetadata<M>	apply(Class<? extends RelNode> relClass, Class<? extends M> metadataClass) Deprecated.
static void	clearStaticCache()
boolean	equals(@Nullable Object obj)
<MH extends MetadataHandler<?>> MH	handler(Class<MH> handlerClass) Provide a handler for the requested metadata class.
List<MetadataHandler<?>>	handlers(Class<? extends MetadataHandler<?>> handlerClass) Retrieves a list of MetadataHandler for implements a particular MetadataHandler.class.
<M extends Metadata> com.google.common.collect.Multimap<Method,MetadataHandler<M>>	handlers(MetadataDef<M> def) Deprecated.
int	hashCode()
static JaninoRelMetadataProvider	of(RelMetadataProvider provider) Creates a JaninoRelMetadataProvider.
void	register(Iterable<Class<? extends RelNode>> classes) Deprecated.
<H extends MetadataHandler<?>> H	revise(Class<H> handlerClass) Revise the handler for a given kind of metadata.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT

public static final JaninoRelMetadataProvider DEFAULT

Method Detail

of

public static JaninoRelMetadataProvider of(RelMetadataProvider provider)

Creates a JaninoRelMetadataProvider.

Parameters:

provider - Underlying provider

equals

public boolean equals(@Nullable Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

apply

@Deprecated
public <M extends Metadata> UnboundMetadata<M> apply(Class<? extends RelNode> relClass,
                                                                 Class<? extends M> metadataClass)

Deprecated.

Description copied from interface: RelMetadataProvider

Retrieves metadata of a particular type and for a particular sub-class of relational expression.

The object returned is a function. It can be applied to a relational expression of the given type to create a metadata object.

For example, you might call

 RelMetadataProvider provider;
 LogicalFilter filter;
 RexNode predicate;
 Function<RelNode, Metadata> function =
   provider.apply(LogicalFilter.class, Selectivity.class};
 Selectivity selectivity = function.apply(filter);
 Double d = selectivity.selectivity(predicate);
 

Specified by:

apply in interface RelMetadataProvider

Parameters:

relClass - Type of relational expression

metadataClass - Type of metadata

Returns:

Function that will field a metadata instance; or null if this provider cannot supply metadata of this type

handlers

@Deprecated
public <M extends Metadata> com.google.common.collect.Multimap<Method,MetadataHandler<M>> handlers(MetadataDef<M> def)

Deprecated.

Specified by:

handlers in interface RelMetadataProvider

handlers

public List<MetadataHandler<?>> handlers(Class<? extends MetadataHandler<?>> handlerClass)

Description copied from interface: RelMetadataProvider

Retrieves a list of MetadataHandler for implements a particular MetadataHandler.class. The resolution order is specificity of the relNode class, with preference given to handlers that occur earlier in the list. For instance, given a return list of {A, B, C} where A implements RelNode and Scan, B implements Scan, and C implements LogicalScan and Filter. Scan dispatches to a.method(Scan) LogicalFilter dispatches to c.method(Filter). LogicalScan dispatches to c.method(LogicalScan). Aggregate dispatches to a.method(RelNode). The behavior is undefined if the class hierarchy for dispatching is not a tree.

Specified by:

handlers in interface RelMetadataProvider

revise

public <H extends MetadataHandler<?>> H revise(Class<H> handlerClass)

Description copied from interface: MetadataHandlerProvider

Revise the handler for a given kind of metadata.

Should be invoked if the existing handler throws a MetadataHandlerProvider.NoHandler exception.

Specified by:

revise in interface MetadataHandlerProvider

Type Parameters:

H - The type metadata the handler provides.

Parameters:

handlerClass - The type of class to revise.

Returns:

A new handler that should be used instead of any previous handler provided.

register

@Deprecated
public void register(Iterable<Class<? extends RelNode>> classes)

Deprecated.

Registers some classes. Does not flush the providers, but next time we need to generate a provider, it will handle all of these classes. So, calling this method reduces the number of times we need to re-generate.

handler

public <MH extends MetadataHandler<?>> MH handler(Class<MH> handlerClass)

Description copied from interface: MetadataHandlerProvider

Provide a handler for the requested metadata class.

Specified by:

handler in interface MetadataHandlerProvider

Type Parameters:

MH - The metadata type the handler relates to.

Parameters:

handlerClass - The handler interface expected

Returns:

The handler implementation.

clearStaticCache

@API(status=INTERNAL)
public static void clearStaticCache()