[Mondrian] ValidMeasure() combined with Aggregate()

[Ajit Vasudeo Joglekar]

We are exploring how we can do something like SSAS2005 
IgnoreUnrelatedDimensions in mondrian. 

General approach we are trying out is to pull the unrelated dimensions to 
all/default member and eliminate any duplicates formed due to pulling up 
to all level inside the aggregate function evaluation method. E.g. in 
AggregateFunDef evaluateDouble method inside the anonymous 
AbstractDoubleCalc. Eventually same thing will have to be done in all 
other agg functions

The decision whether to apply this logic can be driven by a property 
"IgnoreUnrelatedDimensions" defined at base cube level since MeasureGroups 
are not yet there in mondrian

The approach looks promising till now. We will soon post prototype code. 
In the mean while requesting ideas, comments. Are we missing anything 
important here?

Thanks,
-Ajit
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