org.apache.gravitino.rel.expressions.distributions

Enum Strategy

java.lang.Object

java.lang.Enum<Strategy>

org.apache.gravitino.rel.expressions.distributions.Strategy

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<Strategy>

@Evolving
public enum Strategy
extends java.lang.Enum<Strategy>

An enum that defines the distribution strategy.

The following strategies are supported:

• Hash: Uses the hash value of the expression to distribute data.
• Range: Uses the range of the expression specified to distribute data.
• Even: Distributes data evenly across partitions.

Enum Constant Summary

Enum Constants

Enum Constant and Description
EVEN Distributes data evenly across partitions.
HASH Uses the hash value of the expression to distribute data.
NONE No distribution strategy.
RANGE Uses the range of the expression specified to distribute data.

Method Summary

Modifier and Type	Method and Description
static Strategy	getByName(java.lang.String name) Get the distribution strategy by name.
static Strategy	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static Strategy[]	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

NONE

public static final Strategy NONE

No distribution strategy. This is the default strategy. Will depend on the allocation strategy of the underlying system.

HASH

public static final Strategy HASH

Uses the hash value of the expression to distribute data.

RANGE

public static final Strategy RANGE

Uses the range of the expression specified to distribute data. The range is specified using the rangeStart and rangeEnd properties.

EVEN

public static final Strategy EVEN

Distributes data evenly across partitions.

Method Detail

values

public static Strategy[] 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 (Strategy c : Strategy.values())
    System.out.println(c);

Returns:

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

valueOf

public static Strategy valueOf(java.lang.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:

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

java.lang.NullPointerException - if the argument is null

getByName

public static Strategy getByName(java.lang.String name)

Get the distribution strategy by name.

Parameters:

name - The name of the distribution strategy.

Returns:

The distribution strategy.