co.cask.cdap.dq.functions

Interface CombinableAggregationFunction<T>

Type Parameters:

T - Aggregation type

All Superinterfaces:

BasicAggregationFunction

All Known Implementing Classes:

DiscreteValuesHistogram, UniqueValues

public interface CombinableAggregationFunction<T>
extends BasicAggregationFunction

Aggregation Function Interface This is for aggregation that still make sense when combined. An example of such a function would be a discrete values histogram. If several histograms (each corresponding to various time intervals) were combined the result would be a histogram that would represent the frequencies of various values over the combined time interval

Method Summary

Methods

Modifier and Type	Method and Description
void	combine(byte[] values) Combine existing aggregations one-by-one
T	retrieveAggregation() Retrieve a combined aggregation

Methods inherited from interface co.cask.cdap.dq.functions.BasicAggregationFunction

add, aggregate, deserialize

Method Detail

retrieveAggregation

T retrieveAggregation()

Retrieve a combined aggregation

combine

void combine(byte[] values)

Combine existing aggregations one-by-one