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

Class SortedFirstOrLastByFactoryImpl

java.lang.Object

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

com.illumon.iris.db.v2.by.IterativeIndexStateFactory

com.illumon.iris.db.v2.by.SortedFirstOrLastByFactoryImpl

All Implemented Interfaces:

AggregationStateFactory, Serializable

Direct Known Subclasses:

SortedFirstBy, SortedLastBy

public class SortedFirstOrLastByFactoryImpl
extends IterativeIndexStateFactory
implements Serializable

See Also:

Serialized Form

Field Summary

Fields inherited from class com.illumon.iris.db.v2.by.IterativeIndexStateFactory

redirectionIndex

Method Summary

Modifier and Type	Method	Description
AggregationMemoKey	getMemoKey()	Produces a MemoKey for this aggregation state factory.
String[]	getSortColumnNames()
boolean	isSortedFirst()

Methods inherited from class java.lang.Object

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

Method Details

getSortColumnNames

public String[] getSortColumnNames()

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.

isSortedFirst

public boolean isSortedFirst()