org.apache.calcite.rel

Class RelDistributions.RelDistributionImpl

java.lang.Object

org.apache.calcite.rel.RelDistributions.RelDistributionImpl

All Implemented Interfaces:

Comparable<RelMultipleTrait>, RelMultipleTrait, RelTrait, RelDistribution

Enclosing class:

RelDistributions

private static class RelDistributions.RelDistributionImpl
extends Object
implements RelDistribution

Implementation of RelDistribution.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.rel.RelDistribution

RelDistribution.Type

Field Summary

Fields

Modifier and Type	Field and Description
private ImmutableIntList	keys
private static com.google.common.collect.Ordering<Iterable<Integer>>	ORDERING
private RelDistribution.Type	type

Constructor Summary

Constructors

Modifier	Constructor and Description
private	RelDistributionImpl(RelDistribution.Type type, ImmutableIntList keys)

Method Summary

Modifier and Type	Method and Description
RelDistribution	apply(Mappings.TargetMapping mapping)
int	compareTo(RelMultipleTrait o)
boolean	equals(Object obj) See note about equals() and hashCode().
List<Integer>	getKeys() Returns the ordinals of the key columns.
RelDistributionTraitDef	getTraitDef() Returns the RelTraitDef that defines this RelTrait.
RelDistribution.Type	getType() Returns the type of distribution.
int	hashCode() See note about equals() and hashCode().
boolean	isTop() Returns whether this trait is satisfied by every instance of the trait (including itself).
void	register(RelOptPlanner planner) Registers a trait instance with the planner.
boolean	satisfies(RelTrait trait) Returns whether this trait satisfies a given trait.
String	toString() Returns a succinct name for this trait.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ORDERING

private static final com.google.common.collect.Ordering<Iterable<Integer>> ORDERING

type

private final RelDistribution.Type type

keys

private final ImmutableIntList keys

Constructor Detail

RelDistributionImpl

private RelDistributionImpl(RelDistribution.Type type,
                            ImmutableIntList keys)

Method Detail

hashCode

public int hashCode()

Description copied from interface: RelTrait

See note about equals() and hashCode().

Specified by:

hashCode in interface RelTrait

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Description copied from interface: RelTrait

See note about equals() and hashCode().

Specified by:

equals in interface RelTrait

Overrides:

equals in class Object

toString

public String toString()

Description copied from interface: RelTrait

Returns a succinct name for this trait. The planner may use this String to describe the trait.

Specified by:

toString in interface RelTrait

Overrides:

toString in class Object

getType

@Nonnull
public RelDistribution.Type getType()

Description copied from interface: RelDistribution

Returns the type of distribution.

Specified by:

getType in interface RelDistribution

getKeys

@Nonnull
public List<Integer> getKeys()

Description copied from interface: RelDistribution

Returns the ordinals of the key columns.

Order is important for some types (RANGE); other types (HASH) consider it unimportant but impose an arbitrary order; other types (BROADCAST, SINGLETON) never have keys.

Specified by:

getKeys in interface RelDistribution

getTraitDef

public RelDistributionTraitDef getTraitDef()

Description copied from interface: RelTrait

Returns the RelTraitDef that defines this RelTrait.

Specified by:

getTraitDef in interface RelTrait

Returns:

the RelTraitDef that defines this RelTrait

apply

public RelDistribution apply(Mappings.TargetMapping mapping)

Specified by:

apply in interface RelDistribution

satisfies

public boolean satisfies(RelTrait trait)

Description copied from interface: RelTrait

Returns whether this trait satisfies a given trait.

A trait satisfies another if it is the same or stricter. For example, ORDER BY x, y satisfies ORDER BY x.

A trait's satisfies relation must be a partial order (reflexive, anti-symmetric, transitive). Many traits cannot be "loosened"; their satisfies is an equivalence relation, where only X satisfies X.

If a trait has multiple values (see RelCompositeTrait) a collection (T0, T1, ...) satisfies T if any Ti satisfies T.

Specified by:

satisfies in interface RelTrait

Parameters:

trait - Given trait

Returns:

Whether this trait subsumes a given trait

register

public void register(RelOptPlanner planner)

Description copied from interface: RelTrait

Registers a trait instance with the planner.

This is an opportunity to add rules that relate to that trait. However, typical implementations will do nothing.

Specified by:

register in interface RelTrait

Parameters:

planner - Planner

isTop

public boolean isTop()

Description copied from interface: RelMultipleTrait

Returns whether this trait is satisfied by every instance of the trait (including itself).

Specified by:

isTop in interface RelMultipleTrait

compareTo

public int compareTo(@Nonnull
                     RelMultipleTrait o)

Specified by:

compareTo in interface Comparable<RelMultipleTrait>