Package org.eigenbase.rel.metadata

Defines metadata interfaces and utilities for relational expressions.

See:
Description

Interface Summary

RelMetadataProvider

RelMetadataProvider defines an interface for obtaining metadata about relational expressions.

Class Summary

CachingRelMetadataProvider	CachingRelMetadataProvider implements the RelMetadataProvider interface by caching results from an underlying provider.
CachingRelMetadataProvider.CacheEntry
ChainedRelMetadataProvider	ChainedRelMetadataProvider implements the RelMetadataProvider interface via the Glossary.ChainOfResponsibilityPattern.
DefaultRelMetadataProvider	DefaultRelMetadataProvider supplies a default implementation of the RelMetadataProvider interface.
ReflectiveRelMetadataProvider	ReflectiveRelMetadataProvider provides an abstract base for reflective implementations of the RelMetadataProvider interface.
RelColumnMapping	RelColumnMapping records a 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.
RelMdColumnOrigins	RelMdColumnOrigins supplies a default implementation of RelMetadataQuery.getColumnOrigins(org.eigenbase.rel.RelNode, int) for the standard logical algebra.
RelMdColumnUniqueness	RelMdColumnUniqueness supplies a default implementation of RelMetadataQuery.areColumnsUnique(org.eigenbase.rel.RelNode, java.util.BitSet) for the standard logical algebra.
RelMdDistinctRowCount	RelMdDistinctRowCount supplies a default implementation of RelMetadataQuery.getDistinctRowCount(org.eigenbase.rel.RelNode, java.util.BitSet, org.eigenbase.rex.RexNode) for the standard logical algebra.
RelMdExplainVisibility	RelMdExplainVisibility supplies a default implementation of RelMetadataQuery.isVisibleInExplain(org.eigenbase.rel.RelNode, org.eigenbase.sql.SqlExplainLevel) for the standard logical algebra.
RelMdPercentageOriginalRows	RelMdPercentageOriginalRows supplies a default implementation of RelMetadataQuery.getPercentageOriginalRows(org.eigenbase.rel.RelNode) for the standard logical algebra.
RelMdPopulationSize	RelMdPopulationSize supplies a default implementation of RelMetadataQuery.getPopulationSize(org.eigenbase.rel.RelNode, java.util.BitSet) for the standard logical algebra.
RelMdRowCount	RelMdRowCount supplies a default implementation of RelMetadataQuery.getRowCount(org.eigenbase.rel.RelNode) for the standard logical algebra.
RelMdSelectivity	RelMdSelectivity supplies a default implementation of RelMetadataQuery.getSelectivity(org.eigenbase.rel.RelNode, org.eigenbase.rex.RexNode) for the standard logical algebra.
RelMdUniqueKeys	RelMdUniqueKeys supplies a default implementation of RelMetadataQuery.getUniqueKeys(org.eigenbase.rel.RelNode) for the standard logical algebra.
RelMdUtil	RelMdUtil provides utility methods used by the metadata provider methods.
RelMdUtil.CardOfProjExpr
RelMetadataQuery	RelMetadataQuery provides a strongly-typed facade on top of RelMetadataProvider for the set of relational expression metadata queries defined as standard within Eigenbase.

Package org.eigenbase.rel.metadata Description

Defines metadata interfaces and utilities for relational expressions.

Revision	$Id: //open/dev/farrago/src/org/eigenbase/rel/metadata/package.html#4 $
Copyright	Copyright (C) 2006-2009 The Eigenbase Project Copyright (C) 2006-2009 SQLstream, Inc. Copyright (C) 2006-2009 LucidEra, Inc.
Author	John V. Sichi