Package com.illumon.iris.db.v2.by

Class VarStateFactory

java.lang.Object

com.illumon.iris.db.v2.by.ReaggregatableStatefactory

com.illumon.iris.db.v2.by.IterativeOperatorStateFactory

com.illumon.iris.db.v2.by.VarStateFactory

All Implemented Interfaces:

BasicDeflatable<VarStateFactory>, AggregationStateFactory, IterativeChunkedOperatorFactory

public class VarStateFactory
extends IterativeOperatorStateFactory
implements BasicDeflatable<VarStateFactory>

Factory for iterative variance aggregations.

Constructor Summary

Constructors

Constructor	Description
VarStateFactory()

Method Summary

Modifier and Type	Method	Description
BasicInflatable<VarStateFactory>	deflate()
IterativeChunkedAggregationOperator	getChunkedOperator(Class type, String name, boolean exposeInternalColumns)
AggregationMemoKey	getMemoKey()	Produces a MemoKey for this aggregation state factory.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

VarStateFactory

public VarStateFactory()

Method Details

getChunkedOperator

public IterativeChunkedAggregationOperator getChunkedOperator(Class type,
 String name,
 boolean exposeInternalColumns)

Specified by:

getChunkedOperator in interface IterativeChunkedOperatorFactory

Specified by:

getChunkedOperator in class IterativeOperatorStateFactory

getMemoKey

public AggregationMemoKey getMemoKey()

Description copied from interface: AggregationStateFactory

Produces a MemoKey for this aggregation state factory.

If two AggregationStateFactories have equal memoKeys, then Table.by(com.illumon.iris.db.v2.by.AggregationStateFactory, com.illumon.iris.db.v2.select.SelectColumn...) operations that have the same group by columns may be memoized. In that case instead of recomputing the result; the original result will be used.

If null is returned, the operation will not be memoized.

Specified by:

getMemoKey in interface AggregationStateFactory

Returns:

an AggregationMemoKey, null if this operation can not be memoized.

deflate

public BasicInflatable<VarStateFactory> deflate()

Specified by:

deflate in interface BasicDeflatable<VarStateFactory>

toString

public String toString()

Overrides:

toString in class Object