org.apache.hadoop.hive.ql.exec.vector

Class VectorAggregationDesc

java.lang.Object

org.apache.hadoop.hive.ql.exec.vector.VectorAggregationDesc

All Implemented Interfaces:

Serializable

public class VectorAggregationDesc
extends Object
implements Serializable

VectorAggregationDesc. Mode is GenericUDAFEvaluator.Mode. It is the different modes for an aggregate UDAF (User Defined Aggregation Function). (Notice the these names are a subset of GroupByDesc.Mode...) PARTIAL1 Original data --> Partial aggregation data PARTIAL2 Partial aggregation data --> Partial aggregation data FINAL Partial aggregation data --> Full aggregation data COMPLETE Original data --> Full aggregation data SIMPLEST CASE --> The data type/semantics of original data, partial aggregation data, and full aggregation data ARE THE SAME. E.g. MIN, MAX, SUM. The different modes can be handled by one aggregation class. This case has a null for the Mode. FOR OTHERS --> The data type/semantics of partial aggregation data and full aggregation data ARE THE SAME but different than original data. This results in 2 aggregation classes: 1) A class that takes original rows and outputs partial/full aggregation (PARTIAL1/COMPLETE) and 2) A class that takes partial aggregation and produces full aggregation (PARTIAL2/FINAL). E.g. COUNT(*) and COUNT(column) OTHERWISE FULL --> The data type/semantics of partial aggregation data is different than original data and full aggregation data. E.g. AVG uses a STRUCT with count and sum for partial aggregation data. It divides sum by count to produce the average for final aggregation.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	VectorAggregationDesc.VectorAggregationDescBuilder

Constructor Summary

Constructors

Constructor and Description
VectorAggregationDesc()
VectorAggregationDesc(String aggregationName, GenericUDAFEvaluator evaluator, GenericUDAFEvaluator.Mode udafEvaluatorMode, TypeInfo inputTypeInfo, ColumnVector.Type inputColVectorType, VectorExpression inputExpression, TypeInfo outputTypeInfo, ColumnVector.Type outputColVectorType, Class<? extends VectorAggregateExpression> vecAggrClass) Deprecated. use VectorAggregationDescBuilder

Method Summary

Modifier and Type	Method and Description
String	getAggregationName()
List<ConstantVectorExpression>	getConstants()
GenericUDAFEvaluator	getEvaluator()
ColumnVector.Type	getInputColVectorType()
VectorExpression	getInputExpression()
TypeInfo	getInputTypeInfo()
ColumnVector.Type	getOutputColVectorType()
DataTypePhysicalVariation	getOutputDataTypePhysicalVariation()
TypeInfo	getOutputTypeInfo()
GenericUDAFEvaluator.Mode	getUdafEvaluatorMode()
Class<? extends VectorAggregateExpression>	getVecAggrClass()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

VectorAggregationDesc

public VectorAggregationDesc()

VectorAggregationDesc

@Deprecated
public VectorAggregationDesc(String aggregationName,
                                         GenericUDAFEvaluator evaluator,
                                         GenericUDAFEvaluator.Mode udafEvaluatorMode,
                                         TypeInfo inputTypeInfo,
                                         ColumnVector.Type inputColVectorType,
                                         VectorExpression inputExpression,
                                         TypeInfo outputTypeInfo,
                                         ColumnVector.Type outputColVectorType,
                                         Class<? extends VectorAggregateExpression> vecAggrClass)

Deprecated. use VectorAggregationDescBuilder

Method Detail

getAggregationName

public String getAggregationName()

getUdafEvaluatorMode

public GenericUDAFEvaluator.Mode getUdafEvaluatorMode()

getInputTypeInfo

public TypeInfo getInputTypeInfo()

getInputColVectorType

public ColumnVector.Type getInputColVectorType()

getInputExpression

public VectorExpression getInputExpression()

getOutputTypeInfo

public TypeInfo getOutputTypeInfo()

getOutputColVectorType

public ColumnVector.Type getOutputColVectorType()

getOutputDataTypePhysicalVariation

public DataTypePhysicalVariation getOutputDataTypePhysicalVariation()

getEvaluator

public GenericUDAFEvaluator getEvaluator()

getVecAggrClass

public Class<? extends VectorAggregateExpression> getVecAggrClass()

getConstants

public List<ConstantVectorExpression> getConstants()

toString

public String toString()

Overrides:

toString in class Object