org.apache.hadoop.hive.metastore.columnstats.aggr

Interface IExtrapolatePartStatus

All Known Implementing Classes:

DateColumnStatsAggregator, DecimalColumnStatsAggregator, DoubleColumnStatsAggregator, LongColumnStatsAggregator, StringColumnStatsAggregator

public interface IExtrapolatePartStatus

Method Summary

Modifier and Type	Method and Description
void	extrapolate(org.apache.hadoop.hive.metastore.api.ColumnStatisticsData extrapolateData, int numParts, int numPartsWithStats, Map<String,Double> adjustedIndexMap, Map<String,org.apache.hadoop.hive.metastore.api.ColumnStatisticsData> adjustedStatsMap, double densityAvg)

Method Detail

extrapolate

void extrapolate(org.apache.hadoop.hive.metastore.api.ColumnStatisticsData extrapolateData,
                 int numParts,
                 int numPartsWithStats,
                 Map<String,Double> adjustedIndexMap,
                 Map<String,org.apache.hadoop.hive.metastore.api.ColumnStatisticsData> adjustedStatsMap,
                 double densityAvg)

Parameters:

extrapolateData - it will carry back the specific stats, e.g., DOUBLE_STATS or LONG_STATS

numParts - the total number of partitions

numPartsWithStats - the number of partitions that have stats

adjustedIndexMap - the partition name to index map

adjustedStatsMap - the partition name to its stats map

densityAvg - the average of ndv density, which is useful when useDensityFunctionForNDVEstimation is true.