com.yahoo.bullet.query.aggregations

Class GroupBy

java.lang.Object

com.yahoo.bullet.query.aggregations.Aggregation

com.yahoo.bullet.query.aggregations.GroupBy

All Implemented Interfaces:

Configurable, Serializable

public class GroupBy
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
GroupBy(Integer size, Map<String,String> fields, Set<GroupOperation> operations) Constructor that creates a GROUP aggregation with a specified max size and fields.

Method Summary

Modifier and Type	Method and Description
List<String>	getFields() Gets the aggregation fields.
Map<String,String>	getFieldsToNames() Gets a map from field names to aliases.
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

GroupBy

public GroupBy(Integer size,
               Map<String,String> fields,
               Set<GroupOperation> operations)

Constructor that creates a GROUP aggregation with a specified max size and fields.

Parameters:

size - The max size of the GROUP aggregation. Can be null.

fields - The non-null and non-empty fields to group by.

operations - The non-null set of group operations. Can be empty.

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.

getFieldsToNames

public Map<String,String> getFieldsToNames()

Gets a map from field names to aliases.

Returns:

A Map from field names to aliases.

toString

public String toString()

Overrides:

toString in class Aggregation