org.apache.calcite.plan

Class RelOptLattice

java.lang.Object

org.apache.calcite.plan.RelOptLattice

public class RelOptLattice
extends Object

Use of a lattice by the query optimizer.

Field Summary

Fields

Modifier and Type	Field and Description
Lattice	lattice
RelOptTable	starRelOptTable

Constructor Summary

Constructors

Constructor and Description
RelOptLattice(Lattice lattice, RelOptTable starRelOptTable)

Method Summary

Methods

Modifier and Type	Method and Description
Pair<CalciteSchema.TableEntry,TileKey>	getAggregate(RelOptPlanner planner, ImmutableBitSet groupSet, List<Lattice.Measure> measureList) Retrieves a materialized table that will satisfy an aggregate query on the star table.
RelNode	rewrite(RelNode node) Rewrites a relational expression to use a lattice.
RelOptTable	rootTable()

Methods inherited from class java.lang.Object

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

Field Detail

lattice

public final Lattice lattice

starRelOptTable

public final RelOptTable starRelOptTable

Constructor Detail

RelOptLattice

public RelOptLattice(Lattice lattice,
             RelOptTable starRelOptTable)

Method Detail

rootTable

public RelOptTable rootTable()

rewrite

public RelNode rewrite(RelNode node)

Rewrites a relational expression to use a lattice.

Returns null if a rewrite is not possible.

Parameters:

node - Relational expression

Returns:

Rewritten query

getAggregate

public Pair<CalciteSchema.TableEntry,TileKey> getAggregate(RelOptPlanner planner,
                                                  ImmutableBitSet groupSet,
                                                  List<Lattice.Measure> measureList)

Retrieves a materialized table that will satisfy an aggregate query on the star table.

The current implementation creates a materialization and populates it, provided that Lattice.auto is true.

Future implementations might return materializations at a different level of aggregation, from which the desired result can be obtained by rolling up.

Parameters:

planner - Current planner

groupSet - Grouping key

measureList - Calls to aggregate functions

Returns:

Materialized table