Package org.apache.calcite.rel.metadata

Defines metadata interfaces and utilities for relational expressions.

See: Description

Interface Summary

Interface	Description
BuiltInMetadata.Collation	Metadata about which columns are sorted.
BuiltInMetadata.ColumnOrigin	Metadata about the origins of columns.
BuiltInMetadata.ColumnUniqueness	Metadata about whether a set of columns uniquely identifies a row.
BuiltInMetadata.CumulativeCost	Metadata about the cost of evaluating a relational expression, including all of its inputs.
BuiltInMetadata.DistinctRowCount	Metadata about the number of distinct rows returned by a set of columns in a relational expression.
BuiltInMetadata.Distribution	Metadata about how a relational expression is distributed.
BuiltInMetadata.ExplainVisibility	Metadata about whether a relational expression should appear in a plan.
BuiltInMetadata.Memory	Metadata about the memory use of an operator.
BuiltInMetadata.NonCumulativeCost	Metadata about the cost of evaluating a relational expression, not including its inputs.
BuiltInMetadata.Parallelism	Metadata about the degree of parallelism of a relational expression, and how its operators are assigned to processes with independent resource pools.
BuiltInMetadata.PercentageOriginalRows	Metadata about the proportion of original rows that remain in a relational expression.
BuiltInMetadata.PopulationSize	Metadata about the number of distinct values in the original source of a column or set of columns.
BuiltInMetadata.Predicates	Metadata about the predicates that hold in the rows emitted from a relational expression.
BuiltInMetadata.RowCount	Metadata about the number of rows returned by a relational expression.
BuiltInMetadata.Selectivity	Metadata about the selectivity of a predicate.
BuiltInMetadata.Size	Metadata about the size of rows and columns.
BuiltInMetadata.UniqueKeys	Metadata about which combinations of columns are unique identifiers.
Metadata	Metadata about a relational expression.
MetadataFactory	Source of metadata about relational expressions.
RelMetadataProvider	RelMetadataProvider defines an interface for obtaining metadata about relational expressions.

Class Summary

Class	Description
BuiltInMetadata	Contains the interfaces for several common forms of metadata.
CachingRelMetadataProvider	Implementation of the RelMetadataProvider interface that caches results from an underlying provider.
ChainedRelMetadataProvider	Implementation of the RelMetadataProvider interface via the Glossary.CHAIN_OF_RESPONSIBILITY_PATTERN.
DefaultRelMetadataProvider	DefaultRelMetadataProvider supplies a default implementation of the RelMetadataProvider interface.
MetadataFactoryImpl	Implementation of MetadataFactory that gets providers from a RelMetadataProvider and stores them in a cache.
ReflectiveRelMetadataProvider	Implementation of the RelMetadataProvider interface that dispatches metadata methods to methods on a given object via reflection.
RelColumnMapping	Mapping from an input column of a RelNode to one of its output columns.
RelColumnOrigin	RelColumnOrigin is a data structure describing one of the origins of an output column produced by a relational expression.
RelMdCollation	RelMdCollation supplies a default implementation of RelMetadataQuery.collations(org.apache.calcite.rel.RelNode) for the standard logical algebra.
RelMdColumnOrigins	RelMdColumnOrigins supplies a default implementation of RelMetadataQuery.getColumnOrigins(org.apache.calcite.rel.RelNode, int) for the standard logical algebra.
RelMdColumnUniqueness	RelMdColumnUniqueness supplies a default implementation of RelMetadataQuery.areColumnsUnique(org.apache.calcite.rel.RelNode, org.apache.calcite.util.ImmutableBitSet) for the standard logical algebra.
RelMdDistinctRowCount	RelMdDistinctRowCount supplies a default implementation of RelMetadataQuery.getDistinctRowCount(org.apache.calcite.rel.RelNode, org.apache.calcite.util.ImmutableBitSet, org.apache.calcite.rex.RexNode) for the standard logical algebra.
RelMdDistribution	RelMdCollation supplies a default implementation of RelMetadataQuery.distribution(org.apache.calcite.rel.RelNode) for the standard logical algebra.
RelMdExplainVisibility	RelMdExplainVisibility supplies a default implementation of RelMetadataQuery.isVisibleInExplain(org.apache.calcite.rel.RelNode, org.apache.calcite.sql.SqlExplainLevel) for the standard logical algebra.
RelMdMemory	Default implementations of the BuiltInMetadata.Memory metadata provider for the standard logical algebra.
RelMdParallelism	Default implementations of the BuiltInMetadata.Parallelism metadata provider for the standard logical algebra.
RelMdPercentageOriginalRows	RelMdPercentageOriginalRows supplies a default implementation of RelMetadataQuery.getPercentageOriginalRows(org.apache.calcite.rel.RelNode) for the standard logical algebra.
RelMdPopulationSize	RelMdPopulationSize supplies a default implementation of RelMetadataQuery.getPopulationSize(org.apache.calcite.rel.RelNode, org.apache.calcite.util.ImmutableBitSet) for the standard logical algebra.
RelMdPredicates	Utility to infer Predicates that are applicable above a RelNode.
RelMdRowCount	RelMdRowCount supplies a default implementation of RelMetadataQuery.getRowCount(org.apache.calcite.rel.RelNode) for the standard logical algebra.
RelMdSelectivity	RelMdSelectivity supplies a default implementation of RelMetadataQuery.getSelectivity(org.apache.calcite.rel.RelNode, org.apache.calcite.rex.RexNode) for the standard logical algebra.
RelMdSize	Default implementations of the BuiltInMetadata.Size metadata provider for the standard logical algebra.
RelMdUniqueKeys	RelMdUniqueKeys supplies a default implementation of RelMetadataQuery.getUniqueKeys(org.apache.calcite.rel.RelNode) for the standard logical algebra.
RelMdUtil	RelMdUtil provides utility methods used by the metadata provider methods.
RelMetadataQuery	RelMetadataQuery provides a strongly-typed facade on top of RelMetadataProvider for the set of relational expression metadata queries defined as standard within Calcite.

Package org.apache.calcite.rel.metadata Description

Defines metadata interfaces and utilities for relational expressions.