Package org.apache.calcite.plan

Class RelOptMaterializations

java.lang.Object

org.apache.calcite.plan.RelOptMaterializations

public abstract class RelOptMaterializations
extends java.lang.Object

Utility methods for using materialized views and lattices for queries.

Constructor Summary

Constructors

Constructor	Description
RelOptMaterializations()

Method Summary

Modifier and Type	Method	Description
static java.util.List<RelOptMaterialization>	getApplicableMaterializations(RelNode rel, java.util.List<RelOptMaterialization> materializations)	Returns a list of materializations that can potentially be used by the query.
private static java.util.List<RelNode>	substitute(RelNode root, RelOptMaterialization materialization)
static java.util.List<Pair<RelNode,RelOptLattice>>	useLattices(RelNode rel, java.util.List<RelOptLattice> lattices)	Returns a list of RelNode transformed from all possible lattice uses.
static java.util.List<Pair<RelNode,java.util.List<RelOptMaterialization>>>	useMaterializedViews(RelNode rel, java.util.List<RelOptMaterialization> materializations)	Returns a list of RelNode transformed from all possible combination of materialized view uses.
private static boolean	usesTable(java.util.List<java.lang.String> qualifiedName, java.util.Set<RelOptTable> usedTables, Graphs.FrozenGraph<java.util.List<java.lang.String>,DefaultEdge> usesGraph)	Returns whether table uses one or more of the tables in usedTables.

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 java.util.List<Pair<RelNode,java.util.List<RelOptMaterialization>>> useMaterializedViews(RelNode rel,
                                                                                                             java.util.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.

useLattices

public static java.util.List<Pair<RelNode,RelOptLattice>> useLattices(RelNode rel,
                                                                            java.util.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 java.util.List<RelOptMaterialization> getApplicableMaterializations(RelNode rel,
                                                                                  java.util.List<RelOptMaterialization> materializations)

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

substitute

private static java.util.List<RelNode> substitute(RelNode root,
                                                  RelOptMaterialization materialization)

usesTable

private static boolean usesTable(java.util.List<java.lang.String> qualifiedName,
                                 java.util.Set<RelOptTable> usedTables,
                                 Graphs.FrozenGraph<java.util.List<java.lang.String>,DefaultEdge> usesGraph)

Returns whether table uses one or more of the tables in usedTables.