com.illumon.iris.db.v2.by.KeyOnlyFirstOrLastByStateFactory

All Implemented Interfaces:: BasicDeflatable<KeyOnlyFirstOrLastByStateFactory>, AggregationStateFactory

public class KeyOnlyFirstOrLastByStateFactory
extends IterativeIndexStateFactory
implements BasicDeflatable<KeyOnlyFirstOrLastByStateFactory>

A Flavor of FirstBy that produces no values from the original table, only a named column of source keys.

Field Summary

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

Constructors

Constructor Description

KeyOnlyFirstOrLastByStateFactory(String resultColumn, AggType type)

Method Summary

Modifier and Type	Method	Description
`BasicInflatable<KeyOnlyFirstOrLastByStateFactory>`	`deflate()`
`AggregationMemoKey`	`getMemoKey()`	Produces a MemoKey for this aggregation state factory.
`String`	`getResultColumn()`
`boolean`	`isLast()`
`String`	`toString()`

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

Constructor Details
- KeyOnlyFirstOrLastByStateFactory
  
  public KeyOnlyFirstOrLastByStateFactory(String resultColumn, AggType type)
Method Details
- getResultColumn
  
  public String getResultColumn()
- isLast
  
  public boolean isLast()
- 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.
- toString
  
  public String toString()
  
  Overrides:
  
  toString in class Object
- deflate
  
  public BasicInflatable<KeyOnlyFirstOrLastByStateFactory> deflate()
  
  Specified by:
  
  deflate in interface BasicDeflatable<KeyOnlyFirstOrLastByStateFactory>

Class KeyOnlyFirstOrLastByStateFactory