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

Class GenericUDAFComputeStats.GenericUDAFStringStatsEvaluator.StringStatsAgg

java.lang.Object

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

org.apache.hadoop.hive.ql.udf.generic.GenericUDAFComputeStats.GenericUDAFStringStatsEvaluator.StringStatsAgg

All Implemented Interfaces:

GenericUDAFEvaluator.AggregationBuffer

Enclosing class:

GenericUDAFComputeStats.GenericUDAFStringStatsEvaluator

public static class GenericUDAFComputeStats.GenericUDAFStringStatsEvaluator.StringStatsAgg
extends GenericUDAFEvaluator.AbstractAggregationBuffer

Field Summary

Fields

Modifier and Type	Field and Description
String	columnType
long	count
long	countNulls
boolean	firstItem
long	maxLength
NumDistinctValueEstimator	numDV
long	sumLength

Constructor Summary

Constructors

Constructor and Description
StringStatsAgg()

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 String columnType

maxLength

public long maxLength

sumLength

public long sumLength

count

public long count

countNulls

public long countNulls

numDV

public NumDistinctValueEstimator numDV

firstItem

public boolean firstItem

Constructor Detail

StringStatsAgg

public StringStatsAgg()

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