com.yahoo.bullet.query.aggregations

Class TopK

java.lang.Object

com.yahoo.bullet.query.aggregations.Aggregation

com.yahoo.bullet.query.aggregations.TopK

All Implemented Interfaces:

Configurable, Serializable

public class TopK
extends Aggregation

See Also:

Serialized Form

Field Summary

Fields inherited from class com.yahoo.bullet.query.aggregations.Aggregation

size, type

Constructor Summary

Constructors

Constructor and Description
TopK(Map<String,String> fieldsToNames, Integer size, Long threshold, String name) Constructor that creates a TOP_K aggregation with a specified max size.

Method Summary

Modifier and Type	Method and Description
List<String>	getFields() Gets the aggregation fields.
Strategy	getStrategy(BulletConfig config) Returns a new Strategy instance that handles this aggregation.
String	toString()

Methods inherited from class com.yahoo.bullet.query.aggregations.Aggregation

configure

Methods inherited from class java.lang.Object

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

Constructor Detail

TopK

public TopK(Map<String,String> fieldsToNames,
            Integer size,
            Long threshold,
            String name)

Constructor that creates a TOP_K aggregation with a specified max size.

Parameters:

fieldsToNames - The mapping of fields to aliases of the Top K aggregation. Must not be empty.

size - The max size of the Top K aggregation. Can be null.

threshold - The minimum threshold of the Top K aggregation. Can be null.

name - The name of the count field.

Method Detail

getStrategy

public Strategy getStrategy(BulletConfig config)

Description copied from class: Aggregation

Returns a new Strategy instance that handles this aggregation.

Specified by:

getStrategy in class Aggregation

Parameters:

config - The BulletConfig containing configuration for the strategy.

Returns:

The created instance of a strategy that can implement this aggregation.

getFields

public List<String> getFields()

Description copied from class: Aggregation

Gets the aggregation fields.

Overrides:

getFields in class Aggregation

Returns:

The aggregation fields.

toString

public String toString()

Overrides:

toString in class Aggregation