co.cask.cdap.dq.functions

Class UniqueValues

java.lang.Object

co.cask.cdap.dq.functions.UniqueValues

All Implemented Interfaces:

BasicAggregationFunction, CombinableAggregationFunction<Set<String>>

public class UniqueValues
extends Object
implements BasicAggregationFunction, CombinableAggregationFunction<Set<String>>

Unique Values Aggregation Function

Constructor Summary

Constructors

Constructor and Description
UniqueValues()

Method Summary

Methods

Modifier and Type	Method and Description
void	add(DataQualityWritable value) Incrementally add values to the aggregation
byte[]	aggregate() Return the aggregation accumulated using add() in the form of a byte[]
void	combine(byte[] value) Combine existing aggregations one-by-one
Set<String>	deserialize(byte[] valueBytes) Deserialize a given value appropriately
Set<String>	retrieveAggregation() Retrieve a combined aggregation

Methods inherited from class java.lang.Object

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

Constructor Detail

UniqueValues

public UniqueValues()

Method Detail

retrieveAggregation

public Set<String> retrieveAggregation()

Description copied from interface: CombinableAggregationFunction

Retrieve a combined aggregation

Specified by:

retrieveAggregation in interface CombinableAggregationFunction<Set<String>>

deserialize

public Set<String> deserialize(byte[] valueBytes)

Description copied from interface: BasicAggregationFunction

Deserialize a given value appropriately

Specified by:

deserialize in interface BasicAggregationFunction

combine

public void combine(byte[] value)

Description copied from interface: CombinableAggregationFunction

Combine existing aggregations one-by-one

Specified by:

combine in interface CombinableAggregationFunction<Set<String>>

add

public void add(DataQualityWritable value)

Description copied from interface: BasicAggregationFunction

Incrementally add values to the aggregation

Specified by:

add in interface BasicAggregationFunction

aggregate

public byte[] aggregate()

Description copied from interface: BasicAggregationFunction

Return the aggregation accumulated using add() in the form of a byte[]

Specified by:

aggregate in interface BasicAggregationFunction