org.apache.hadoop.hive.ql.plan

Enum VectorGroupByDesc.ProcessingMode

java.lang.Object

java.lang.Enum<VectorGroupByDesc.ProcessingMode>

org.apache.hadoop.hive.ql.plan.VectorGroupByDesc.ProcessingMode

All Implemented Interfaces:

Serializable, Comparable<VectorGroupByDesc.ProcessingMode>

Enclosing class:

VectorGroupByDesc

public static enum VectorGroupByDesc.ProcessingMode
extends Enum<VectorGroupByDesc.ProcessingMode>

GLOBAL No key. All rows --> 1 full aggregation on end of input HASH Rows aggregated in to hash table on group key --> 1 partial aggregation per key (normally, unless there is spilling) MERGE_PARTIAL As first operator in a REDUCER, partial aggregations come grouped from reduce-shuffle --> aggregate the partial aggregations and emit full aggregation on endGroup / closeOp STREAMING Rows come from PARENT operator already grouped --> aggregate the rows and emit full aggregation on key change / closeOp NOTE: Hash can spill partial result rows prematurely if it runs low on memory. NOTE: Streaming has to compare keys where MergePartial gets an endGroup call.

Enum Constant Summary

Enum Constants

Enum Constant and Description
GLOBAL
HASH
MERGE_PARTIAL
NONE
STREAMING

Method Summary

Modifier and Type	Method and Description
static VectorGroupByDesc.ProcessingMode	valueOf(String name) Returns the enum constant of this type with the specified name.
static VectorGroupByDesc.ProcessingMode[]	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 VectorGroupByDesc.ProcessingMode NONE

GLOBAL

public static final VectorGroupByDesc.ProcessingMode GLOBAL

HASH

public static final VectorGroupByDesc.ProcessingMode HASH

MERGE_PARTIAL

public static final VectorGroupByDesc.ProcessingMode MERGE_PARTIAL

STREAMING

public static final VectorGroupByDesc.ProcessingMode STREAMING

Method Detail

values

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

Returns:

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

valueOf

public static VectorGroupByDesc.ProcessingMode 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