org.apache.hadoop.hive.ql.parse

Enum CBOFallbackStrategy

java.lang.Object

java.lang.Enum<CBOFallbackStrategy>

org.apache.hadoop.hive.ql.parse.CBOFallbackStrategy

All Implemented Interfaces:

Serializable, Comparable<CBOFallbackStrategy>

public enum CBOFallbackStrategy
extends Enum<CBOFallbackStrategy>

A strategy defining when CBO fallbacks to the legacy optimizer.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ALWAYS Always use the legacy optimizer, CBO errors are not fatal.
CONSERVATIVE Use the legacy optimizer only when the CBO exception is not related to subqueries and views.
NEVER Never use the legacy optimizer, all CBO errors are fatal.
TEST Specific strategy only for tests.

Method Summary

Modifier and Type	Method and Description
abstract boolean	allowsRetry()
static CBOFallbackStrategy	valueOf(String name) Returns the enum constant of this type with the specified name.
static CBOFallbackStrategy[]	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

NEVER

public static final CBOFallbackStrategy NEVER

Never use the legacy optimizer, all CBO errors are fatal.

CONSERVATIVE

public static final CBOFallbackStrategy CONSERVATIVE

Use the legacy optimizer only when the CBO exception is not related to subqueries and views.

ALWAYS

public static final CBOFallbackStrategy ALWAYS

Always use the legacy optimizer, CBO errors are not fatal.

TEST

public static final CBOFallbackStrategy TEST

Specific strategy only for tests.

Method Detail

values

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

Returns:

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

valueOf

public static CBOFallbackStrategy 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

allowsRetry

public abstract boolean allowsRetry()