Package org.apache.cassandra.db.aggregation

Class AggregationSpecification

java.lang.Object

org.apache.cassandra.db.aggregation.AggregationSpecification

public abstract class AggregationSpecification
extends Object

Defines how rows should be grouped for creating aggregates.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	AggregationSpecification.Factory	Factory for AggregationSpecification.
static enum	AggregationSpecification.Kind	The AggregationSpecification kinds.
static class	AggregationSpecification.Serializer

Field Summary

Fields

Modifier and Type	Field	Description
static final AggregationSpecification	AGGREGATE_EVERYTHING	AggregationSpecification that group all the row together.
static final AggregationSpecification.Factory	AGGREGATE_EVERYTHING_FACTORY	Factory for AggregationSpecification that group all the row together.
static final AggregationSpecification.Serializer	serializer

Method Summary

Modifier and Type	Method	Description
static AggregationSpecification.Factory	aggregatePkPrefixFactory(ClusteringComparator comparator, int clusteringPrefixSize)	Creates a new Factory instance to create AggregationSpecification that will build aggregates based on primary key columns.
static AggregationSpecification.Factory	aggregatePkPrefixFactoryWithSelector(ClusteringComparator comparator, int clusteringPrefixSize, Selector.Factory factory, List<ColumnMetadata> columns)
AggregationSpecification.Kind	kind()	Returns the AggregationSpecification kind.
final GroupMaker	newGroupMaker()	Creates a new GroupMaker instance.
abstract GroupMaker	newGroupMaker(GroupingState state)	Creates a new GroupMaker instance.

Methods inherited from class java.lang.Object

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

Field Details

serializer

public static final AggregationSpecification.Serializer serializer

AGGREGATE_EVERYTHING

public static final AggregationSpecification AGGREGATE_EVERYTHING

AggregationSpecification that group all the row together.

AGGREGATE_EVERYTHING_FACTORY

public static final AggregationSpecification.Factory AGGREGATE_EVERYTHING_FACTORY

Factory for AggregationSpecification that group all the row together.

Method Details

kind

public AggregationSpecification.Kind kind()

Returns the AggregationSpecification kind.

Returns:

the AggregationSpecification kind

newGroupMaker

public final GroupMaker newGroupMaker()

Creates a new GroupMaker instance.

Returns:

a new GroupMaker instance

newGroupMaker

public abstract GroupMaker newGroupMaker(GroupingState state)

Creates a new GroupMaker instance.

Parameters:

state - GroupMaker state

Returns:

a new GroupMaker instance

aggregatePkPrefixFactory

public static AggregationSpecification.Factory aggregatePkPrefixFactory(ClusteringComparator comparator,
 int clusteringPrefixSize)

Creates a new Factory instance to create AggregationSpecification that will build aggregates based on primary key columns.

Parameters:

comparator - the comparator used to compare the clustering prefixes

clusteringPrefixSize - the number of clustering columns used to create the aggregates

Returns:

a new Factory instance to create AggregationSpecification that will build aggregates based on primary key columns.

aggregatePkPrefixFactoryWithSelector

public static AggregationSpecification.Factory aggregatePkPrefixFactoryWithSelector(ClusteringComparator comparator,
 int clusteringPrefixSize,
 Selector.Factory factory,
 List<ColumnMetadata> columns)