org.apache.calcite.plan

Class RelOptMaterializations

java.lang.Object

org.apache.calcite.plan.RelOptMaterializations

public abstract class RelOptMaterializations
extends Object

Utility methods for using materialized views and lattices for queries.

Constructor Summary

Constructors

Constructor and Description
RelOptMaterializations()

Method Summary

Modifier and Type	Method and Description
static List<RelOptMaterialization>	getApplicableMaterializations(RelNode rel, List<RelOptMaterialization> materializations) Returns a list of materializations that can potentially be used by the query.
static List<Pair<RelNode,RelOptLattice>>	useLattices(RelNode rel, List<RelOptLattice> lattices) Returns a list of RelNode transformed from all possible lattice uses.
static List<Pair<RelNode,List<RelOptMaterialization>>>	useMaterializedViews(RelNode rel, List<RelOptMaterialization> materializations) Returns a list of RelNode transformed from all possible combination of materialized view uses.
static List<Pair<RelNode,List<RelOptMaterialization>>>	useMaterializedViews(RelNode rel, List<RelOptMaterialization> materializations, List<SubstitutionVisitor.UnifyRule> materializationRules) Returns a list of RelNode transformed from all possible combination of materialized view uses.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RelOptMaterializations

public RelOptMaterializations()

Method Detail

useMaterializedViews

public static List<Pair<RelNode,List<RelOptMaterialization>>> useMaterializedViews(RelNode rel,
                                                                                   List<RelOptMaterialization> materializations)

Returns a list of RelNode transformed from all possible combination of materialized view uses. Big queries will likely have more than one transformed RelNode, e.g., (t1 group by c1) join (t2 group by c2).

Parameters:

rel - the original RelNode

materializations - the materialized view list

Returns:

the list of transformed RelNode together with their corresponding materialized views used in the transformation.

useMaterializedViews

public static List<Pair<RelNode,List<RelOptMaterialization>>> useMaterializedViews(RelNode rel,
                                                                                   List<RelOptMaterialization> materializations,
                                                                                   List<SubstitutionVisitor.UnifyRule> materializationRules)

Returns a list of RelNode transformed from all possible combination of materialized view uses. Big queries will likely have more than one transformed RelNode, e.g., (t1 group by c1) join (t2 group by c2). In addition, you can add custom materialized view recognition rules.

Parameters:

rel - the original RelNode

materializations - the materialized view list

materializationRules - the materialized view recognition rules

Returns:

the list of transformed RelNode together with their corresponding materialized views used in the transformation.

useLattices

public static List<Pair<RelNode,RelOptLattice>> useLattices(RelNode rel,
                                                            List<RelOptLattice> lattices)

Returns a list of RelNode transformed from all possible lattice uses.

Parameters:

rel - the original RelNode

lattices - the lattice list

Returns:

the list of transformed RelNode together with their corresponding lattice used in the transformation.

getApplicableMaterializations

public static List<RelOptMaterialization> getApplicableMaterializations(RelNode rel,
                                                                        List<RelOptMaterialization> materializations)

Returns a list of materializations that can potentially be used by the query.