Package org.apache.calcite.rel.metadata
Class CachingRelMetadataProvider
java.lang.Object
org.apache.calcite.rel.metadata.CachingRelMetadataProvider
- All Implemented Interfaces:
RelMetadataProvider
Deprecated.
Implementation of the
RelMetadataProvider
interface that caches results from an underlying provider.-
Constructor Summary
ConstructorsConstructorDescriptionCachingRelMetadataProvider
(RelMetadataProvider underlyingProvider, RelOptPlanner planner) Deprecated. -
Method Summary
Modifier and TypeMethodDescription<@Nullable M extends @Nullable Metadata>
@Nullable UnboundMetadata<M>Deprecated.List<MetadataHandler<?>>
handlers
(Class<? extends MetadataHandler<?>> handlerClass) Deprecated.Retrieves a list ofMetadataHandler
for implements a particularMetadataHandler
.class.<M extends Metadata>
com.google.common.collect.Multimap<Method,MetadataHandler<M>> handlers
(MetadataDef<M> def) Deprecated.
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Constructor Details
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CachingRelMetadataProvider
Deprecated.
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Method Details
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apply
@Deprecated public <@Nullable M extends @Nullable Metadata> @Nullable UnboundMetadata<M> apply(Class<? extends RelNode> relClass, Class<? extends @Nullable 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 interfaceRelMetadataProvider
- Parameters:
relClass
- Type of relational expressionmetadataClass
- Type of metadata- Returns:
- Function that will field a metadata instance; or null if this provider cannot supply metadata of this type
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handlers
@Deprecated public <M extends Metadata> com.google.common.collect.Multimap<Method,MetadataHandler<M>> handlers(MetadataDef<M> def) Deprecated.- Specified by:
handlers
in interfaceRelMetadataProvider
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handlers
Deprecated.Description copied from interface:RelMetadataProvider
Retrieves a list ofMetadataHandler
for implements a particularMetadataHandler
.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 interfaceRelMetadataProvider
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