This is the base class for implementing aggregators over sum and
average columns in an aggregate table. These differ from the above
aggregators in that these require not oly the operand to create
the aggregation String expression, but also, the aggregate table's
fact count column expression.
These aggregators are NOT singletons like the above aggregators; rather,
each is different because of the fact count column expression.
Nested Class Summary
Nested classes/interfaces inherited from class mondrian.rolap.RolapAggregator