mondrian.rolap
Class RolapAggregator.AvgFromAvg

java.lang.Object
  mondrian.olap.EnumeratedValues.BasicValue
      mondrian.rolap.RolapAggregator
          mondrian.rolap.RolapAggregator.BaseAggor
              mondrian.rolap.RolapAggregator.AvgFromAvg

All Implemented Interfaces:

Aggregator, EnumeratedValues.Value

Enclosing class:

RolapAggregator

public static class RolapAggregator.AvgFromAvg
extends RolapAggregator.BaseAggor

Aggregator used for aggregate tables implementing the average aggregator.

It uses the aggregate table fact_count column and an average measure to create the query used to generate an average:

avg == sum(column_sum * factcount) / sum(factcount).

If the fact table has both a sum and average over the same column and the aggregate table only has a average and fact count column, then the average aggregator can be generated using this aggregator.

Nested Class Summary

Nested classes/interfaces inherited from class mondrian.rolap.RolapAggregator

RolapAggregator.AvgFromAvg, RolapAggregator.AvgFromSum, RolapAggregator.BaseAggor, RolapAggregator.SumFromAvg

Field Summary

Fields inherited from class mondrian.rolap.RolapAggregator.BaseAggor

factCountExpr

Fields inherited from class mondrian.rolap.RolapAggregator

Avg, Count, DistinctCount, enumeration, Max, Min, Sum

Fields inherited from class mondrian.olap.EnumeratedValues.BasicValue

description, name, ordinal

Constructor Summary

RolapAggregator.AvgFromAvg(String factCountExpr)

Method Summary

String

getExpression(String operand) Returns the expression to apply this aggregator to an operand.

Methods inherited from class mondrian.rolap.RolapAggregator.BaseAggor

aggregate

Methods inherited from class mondrian.rolap.RolapAggregator

getNonDistinctAggregator, getRollup, isDistinct

Methods inherited from class mondrian.olap.EnumeratedValues.BasicValue

equals, getDescription, getName, getOrdinal, toString, unexpected

Methods inherited from class java.lang.Object

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

Constructor Detail

RolapAggregator.AvgFromAvg

public RolapAggregator.AvgFromAvg(String factCountExpr)

Method Detail

getExpression

public String getExpression(String operand)

Description copied from class: RolapAggregator

Returns the expression to apply this aggregator to an operand. For example, getExpression("emp.sal") returns "sum(emp.sal)".

Overrides:

getExpression in class RolapAggregator