org.apache.flink.table.planner.utils

Enum AggregatePhaseStrategy

java.lang.Object

java.lang.Enum<AggregatePhaseStrategy>

org.apache.flink.table.planner.utils.AggregatePhaseStrategy

All Implemented Interfaces:

Serializable, Comparable<AggregatePhaseStrategy>

public enum AggregatePhaseStrategy
extends Enum<AggregatePhaseStrategy>

Aggregate phase strategy which could be specified in OptimizerConfigOptions.TABLE_OPTIMIZER_AGG_PHASE_STRATEGY.

Enum Constant Summary

Enum Constants

Enum Constant and Description
AUTO No special enforcer for aggregate stage.
ONE_PHASE Enforce to use one stage aggregate which only has CompleteGlobalAggregate.
TWO_PHASE Enforce to use two stage aggregate which has localAggregate and globalAggregate.

Method Summary

Modifier and Type	Method and Description
static AggregatePhaseStrategy	valueOf(String name) Returns the enum constant of this type with the specified name.
static AggregatePhaseStrategy[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

AUTO

public static final AggregatePhaseStrategy AUTO

No special enforcer for aggregate stage. Whether to choose two stage aggregate or one stage aggregate depends on cost.

ONE_PHASE

public static final AggregatePhaseStrategy ONE_PHASE

Enforce to use one stage aggregate which only has CompleteGlobalAggregate.

TWO_PHASE

public static final AggregatePhaseStrategy TWO_PHASE

Enforce to use two stage aggregate which has localAggregate and globalAggregate. NOTE: If aggregate call does not support split into two phase, still use one stage aggregate.

Method Detail

values

public static AggregatePhaseStrategy[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (AggregatePhaseStrategy c : AggregatePhaseStrategy.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static AggregatePhaseStrategy valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null