org.apache.drill.metastore.statistics

Interface CollectableColumnStatisticsKind<V>

All Superinterfaces:

StatisticsKind<V>

All Known Implementing Classes:

ColumnStatisticsKind

public interface CollectableColumnStatisticsKind<V>
extends StatisticsKind<V>

This class represents kinds of column statistics which may be received as a union of other statistics, for example column nulls count may be received as a sum of nulls counts of underlying metadata parts.

Method Summary

Modifier and Type	Method and Description
Object	mergeStatistics(List<? extends ColumnStatistics<?>> statistics) Returns column statistics value received by collecting specified ColumnStatistics.

Methods inherited from interface org.apache.drill.metastore.statistics.StatisticsKind

getName, isExact

Method Detail

mergeStatistics

Object mergeStatistics(List<? extends ColumnStatistics<?>> statistics)

Returns column statistics value received by collecting specified ColumnStatistics.

Parameters:

statistics - list of ColumnStatistics instances to be collected

Returns:

column statistics value received by collecting specified ColumnStatistics