org.apache.hadoop.hive.metastore.columnstats.merge

Class ColumnStatsMerger<T>

java.lang.Object

org.apache.hadoop.hive.metastore.columnstats.merge.ColumnStatsMerger<T>

Direct Known Subclasses:

BinaryColumnStatsMerger, BooleanColumnStatsMerger, DateColumnStatsMerger, DecimalColumnStatsMerger, DoubleColumnStatsMerger, LongColumnStatsMerger, StringColumnStatsMerger, TimestampColumnStatsMerger

public abstract class ColumnStatsMerger<T>
extends Object

Constructor Summary

Constructors

Constructor and Description
ColumnStatsMerger()

Method Summary

Modifier and Type	Method and Description
abstract void	merge(ColumnStatisticsObj aggregateColStats, ColumnStatisticsObj newColStats)
double	mergeAvgColLen(double oldValue, double newValue)
T	mergeHighValue(T oldValue, T newValue)
protected KllHistogramEstimator	mergeHistogramEstimator(String columnName, KllHistogramEstimator oldEst, KllHistogramEstimator newEst)
T	mergeLowValue(T oldValue, T newValue)
long	mergeMaxColLen(long oldValue, long newValue)
protected long	mergeNumDistinctValueEstimator(String columnName, List<NumDistinctValueEstimator> estimators, long oldNumDVs, long newNumDVs)
long	mergeNumDVs(long oldValue, long newValue)
long	mergeNumNulls(long oldValue, long newValue)

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnStatsMerger

public ColumnStatsMerger()

Method Detail

merge

public abstract void merge(ColumnStatisticsObj aggregateColStats,
                           ColumnStatisticsObj newColStats)

mergeHistogramEstimator

protected KllHistogramEstimator mergeHistogramEstimator(String columnName,
                                                        KllHistogramEstimator oldEst,
                                                        KllHistogramEstimator newEst)

mergeNumDistinctValueEstimator

protected long mergeNumDistinctValueEstimator(String columnName,
                                              List<NumDistinctValueEstimator> estimators,
                                              long oldNumDVs,
                                              long newNumDVs)

mergeLowValue

public T mergeLowValue(T oldValue,
                       T newValue)

mergeHighValue

public T mergeHighValue(T oldValue,
                        T newValue)

mergeNumDVs

public long mergeNumDVs(long oldValue,
                        long newValue)

mergeNumNulls

public long mergeNumNulls(long oldValue,
                          long newValue)

mergeMaxColLen

public long mergeMaxColLen(long oldValue,
                           long newValue)

mergeAvgColLen

public double mergeAvgColLen(double oldValue,
                             double newValue)