Package org.apache.calcite.plan.hep
Class HepRelMetadataProvider
- java.lang.Object
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- org.apache.calcite.plan.hep.HepRelMetadataProvider
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- All Implemented Interfaces:
RelMetadataProvider
class HepRelMetadataProvider extends java.lang.Object implements RelMetadataProvider
HepRelMetadataProvider implements theRelMetadataProvider
interface by combining metadata from the rels inside of aHepRelVertex
.
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Constructor Summary
Constructors Constructor Description HepRelMetadataProvider()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description <M extends Metadata>
UnboundMetadata<M>apply(java.lang.Class<? extends RelNode> relClass, java.lang.Class<? extends M> metadataClass)
Retrieves metadata of a particular type and for a particular sub-class of relational expression.boolean
equals(java.lang.Object obj)
<M extends Metadata>
com.google.common.collect.Multimap<java.lang.reflect.Method,MetadataHandler<M>>handlers(MetadataDef<M> def)
int
hashCode()
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Method Detail
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equals
public boolean equals(java.lang.Object obj)
- Overrides:
equals
in classjava.lang.Object
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hashCode
public int hashCode()
- Overrides:
hashCode
in classjava.lang.Object
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apply
public <M extends Metadata> UnboundMetadata<M> apply(java.lang.Class<? extends RelNode> relClass, java.lang.Class<? extends M> metadataClass)
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
public <M extends Metadata> com.google.common.collect.Multimap<java.lang.reflect.Method,MetadataHandler<M>> handlers(MetadataDef<M> def)
- Specified by:
handlers
in interfaceRelMetadataProvider
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