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

Class GenericUDAFComputeBitVectorBase.NumericStatsAgg

java.lang.Object

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

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

All Implemented Interfaces:

GenericUDAFEvaluator.AggregationBuffer

Direct Known Subclasses:

GenericUDAFComputeBitVectorBase.DateStatsAgg, GenericUDAFComputeBitVectorBase.DecimalStatsAgg, GenericUDAFComputeBitVectorBase.DoubleStatsAgg, GenericUDAFComputeBitVectorBase.LongStatsAgg, GenericUDAFComputeBitVectorBase.TimestampStatsAgg

Enclosing class:

GenericUDAFComputeBitVectorBase

public abstract static class GenericUDAFComputeBitVectorBase.NumericStatsAgg
extends GenericUDAFEvaluator.AbstractAggregationBuffer

Field Summary

Fields

Modifier and Type	Field and Description
NumDistinctValueEstimator	numDV

Constructor Summary

Constructors

Constructor and Description
NumericStatsAgg()

Method Summary

Modifier and Type	Method and Description
int	estimate() Estimate the size of memory which is occupied by aggregation buffer.
void	reset()
protected Object	serialize(org.apache.hadoop.io.BytesWritable result)
protected Object	serializePartial(org.apache.hadoop.io.BytesWritable result)
protected abstract void	update(Object p, PrimitiveObjectInspector inputOI)

Methods inherited from class java.lang.Object

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

Field Detail

numDV

public NumDistinctValueEstimator numDV

Constructor Detail

NumericStatsAgg

public NumericStatsAgg()

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

update

protected abstract void update(Object p,
                               PrimitiveObjectInspector inputOI)

serialize

protected Object serialize(org.apache.hadoop.io.BytesWritable result)

serializePartial

protected Object serializePartial(org.apache.hadoop.io.BytesWritable result)

reset

public void reset()
           throws HiveException

Throws:

HiveException