org.apache.calcite.rel.metadata

Interface MetadataHandler<M extends Metadata>

Type Parameters:

M - Kind of metadata

All Known Subinterfaces:

BuiltInMetadata.AllPredicates.Handler, BuiltInMetadata.Collation.Handler, BuiltInMetadata.ColumnOrigin.Handler, BuiltInMetadata.ColumnUniqueness.Handler, BuiltInMetadata.CumulativeCost.Handler, BuiltInMetadata.DistinctRowCount.Handler, BuiltInMetadata.Distribution.Handler, BuiltInMetadata.ExplainVisibility.Handler, BuiltInMetadata.ExpressionLineage.Handler, BuiltInMetadata.LowerBoundCost.Handler, BuiltInMetadata.MaxRowCount.Handler, BuiltInMetadata.Memory.Handler, BuiltInMetadata.MinRowCount.Handler, BuiltInMetadata.NodeTypes.Handler, BuiltInMetadata.NonCumulativeCost.Handler, BuiltInMetadata.Parallelism.Handler, BuiltInMetadata.PercentageOriginalRows.Handler, BuiltInMetadata.PopulationSize.Handler, BuiltInMetadata.Predicates.Handler, BuiltInMetadata.RowCount.Handler, BuiltInMetadata.Selectivity.Handler, BuiltInMetadata.Size.Handler, BuiltInMetadata.TableReferences.Handler, BuiltInMetadata.UniqueKeys.Handler

All Known Implementing Classes:

RelMdAllPredicates, RelMdCollation, RelMdColumnOrigins, RelMdColumnUniqueness, RelMdDistinctRowCount, RelMdDistribution, RelMdExplainVisibility, RelMdExpressionLineage, RelMdLowerBoundCost, RelMdMaxRowCount, RelMdMemory, RelMdMinRowCount, RelMdNodeTypes, RelMdParallelism, RelMdPopulationSize, RelMdPredicates, RelMdRowCount, RelMdSelectivity, RelMdSize, RelMdTableReferences, RelMdUniqueKeys

public interface MetadataHandler<M extends Metadata>

Marker interface for a handler of metadata.

Method Summary

Modifier and Type	Method and Description
MetadataDef<M>	getDef()
static Method[]	handlerMethods(Class<? extends MetadataHandler<?>> handlerClass) Finds handler methods defined by a MetadataHandler.

Method Detail

getDef

MetadataDef<M> getDef()

handlerMethods

static Method[] handlerMethods(Class<? extends MetadataHandler<?>> handlerClass)

Finds handler methods defined by a MetadataHandler. Static and synthetic methods are ignored.

Parameters:

handlerClass - the handler class to inspect

Returns:

handler methods