SumAggregator (Apache Derby V10.14 Internals)

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java.lang.Object
- org.apache.derby.impl.sql.execute.SystemAggregator
- - org.apache.derby.impl.sql.execute.OrderableAggregator
  - - org.apache.derby.impl.sql.execute.SumAggregator

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, Formatable, TypedFormat, ExecAggregator

Direct Known Subclasses:

AvgAggregator
```
public class SumAggregator
extends OrderableAggregator
```
Aggregator for SUM(). Defers most of its work to OrderableAggregator.

See Also:

Serialized Form

Field Summary
- Fields inherited from class org.apache.derby.impl.sql.execute.OrderableAggregator
  value

Constructor Summary

Constructors
Constructor Description

SumAggregator()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`accumulate(DataValueDescriptor addend)`	Accumulate
`int`	`getTypeFormatId()`	Get the formatID which corresponds to this class.
`ExecAggregator`	`newAggregator()`	Return a new initialized copy of this aggregator, any state set by the setup() method of the original Aggregator must be copied into the new aggregator.
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class org.apache.derby.impl.sql.execute.OrderableAggregator
getResult, merge, readExternal, setup, writeExternal

Methods inherited from class org.apache.derby.impl.sql.execute.SystemAggregator
accumulate, didEliminateNulls

- Constructor Detail
  - SumAggregator
```
public SumAggregator()
```
- Method Detail
  - accumulate
```
protected void accumulate(DataValueDescriptor addend)
                   throws StandardException
```
    Accumulate
    
    Specified by:
    
    accumulate in class SystemAggregator
    
    Parameters:
    
    addend - value to be added in
    
    Throws:
    
    StandardException - on error
    
    See Also:
    
    ExecAggregator.accumulate(org.apache.derby.iapi.types.DataValueDescriptor, java.lang.Object)
  - newAggregator
```
public ExecAggregator newAggregator()
```
    Description copied from interface: ExecAggregator
    
    Return a new initialized copy of this aggregator, any state set by the setup() method of the original Aggregator must be copied into the new aggregator.
    
    Returns:
    
    ExecAggregator the new aggregator
  - getTypeFormatId
```
public int getTypeFormatId()
```
    Get the formatID which corresponds to this class.
    
    Returns:
    
    the formatID of this class
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class OrderableAggregator

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Built on Wed 2018-05-16 16:01:03+0000, from revision ???

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Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.