RelOptLattice (Apache Calcite API)

java.lang.Object
- org.apache.calcite.plan.RelOptLattice

public class RelOptLattice
extends java.lang.Object

Use of a lattice by the query optimizer.

Field Summary

Fields
Modifier and Type Field Description

Lattice lattice

RelOptTable starRelOptTable

Constructor Summary

Constructors
Constructor Description

RelOptLattice(Lattice lattice, RelOptTable starRelOptTable)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Pair<CalciteSchema.TableEntry,TileKey>`	`getAggregate(RelOptPlanner planner, ImmutableBitSet groupSet, java.util.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,
                                                                 java.util.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