At a high level you can find the feature differences between Cache, Ensemble and IRIS here:
How about using a VIEW instead?
In ObjectScript an abstract class simply means that you can not instantiate it. You MUST subclass it and instantiate the subclass.
The concept you understand is supported in Objectscript but it requires that you declare the method itself as abstract.
The two (abstract class keyword and abstract method keyword) work independently of each other.
Does this explain what you are seeing better?
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