org.apache.hadoop.hive.ql.udf.generic

Class GenericUDAFComputeStats.GenericUDAFDoubleStatsEvaluator.DoubleStatsAgg

java.lang.Object

org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.AbstractAggregationBuffer

org.apache.hadoop.hive.ql.udf.generic.GenericUDAFComputeStats.GenericUDAFDoubleStatsEvaluator.DoubleStatsAgg

All Implemented Interfaces:

GenericUDAFEvaluator.AggregationBuffer

Enclosing class:

GenericUDAFComputeStats.GenericUDAFDoubleStatsEvaluator

public static class GenericUDAFComputeStats.GenericUDAFDoubleStatsEvaluator.DoubleStatsAgg
extends GenericUDAFEvaluator.AbstractAggregationBuffer

Field Summary

Fields

Modifier and Type	Field and Description
java.lang.String	columnType
long	countNulls
boolean	firstItem
double	max
double	min
int	numBitVectors
DoubleNumDistinctValueEstimator	numDV

Constructor Summary

Constructors

Constructor and Description
DoubleStatsAgg()

Method Summary

Modifier and Type	Method and Description
int	estimate() Estimate the size of memory which is occupied by aggregation buffer.

Methods inherited from class java.lang.Object

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

Field Detail

columnType

public java.lang.String columnType

min

public double min

max

public double max

countNulls

public long countNulls

numDV

public DoubleNumDistinctValueEstimator numDV

firstItem

public boolean firstItem

numBitVectors

public int numBitVectors

Constructor Detail

DoubleStatsAgg

public DoubleStatsAgg()

Method Detail

estimate

public int estimate()

Description copied from class: GenericUDAFEvaluator.AbstractAggregationBuffer

Estimate the size of memory which is occupied by aggregation buffer. Currently, hive assumes that primitives types occupies 16 byte and java object has 64 byte overhead for each. For map, each entry also has 64 byte overhead.

Overrides:

estimate in class GenericUDAFEvaluator.AbstractAggregationBuffer