AggregateDataStdVar

java.lang.Object

org.h2.expression.aggregate.AggregateData

org.h2.expression.aggregate.AggregateDataStdVar

final class AggregateDataStdVar extends AggregateData

Data stored while calculating a STDDEV_POP, STDDEV_SAMP, VAR_SAMP, VAR_POP, REGR_SXX, or REGR_SYY aggregate.

Field Summary

Fields

Modifier and Type

Field

Description

private final AggregateType

aggregateType

private long

count

private double

m2

private double

mean
Constructor Summary

Constructors

Constructor

Description

AggregateDataStdVar(AggregateType aggregateType)
Method Summary

Modifier and Type

Method

Description

(package private) void

add(SessionLocal session, Value v)

Add a value to this aggregate.

(package private) Value

getValue(SessionLocal session)

Get the aggregate result.

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

Field Details
- aggregateType
  
  private final AggregateType aggregateType
- count
  
  private long count
- m2
  
  private double m2
- mean
  
  private double mean
Constructor Details
- AggregateDataStdVar
  
  AggregateDataStdVar(AggregateType aggregateType)
  
  Parameters:
  
  aggregateType - the type of the aggregate operation
Method Details
- add
  
  void add(SessionLocal session, Value v)
  
  Description copied from class: AggregateData
  
  Add a value to this aggregate.
  
  Specified by:
  
  add in class AggregateData
  
  Parameters:
  
  session - the session
  
  v - the value
- getValue
  
  Value getValue(SessionLocal session)
  
  Description copied from class: AggregateData
  
  Get the aggregate result.
  
  Specified by:
  
  getValue in class AggregateData
  
  Parameters:
  
  session - the session
  
  Returns:
  
  the value