a) To collapse a drill, you should only need to remove the drill
selection, the only reason you might need to remove context is if an
entire dimension is removed from the axis, but I made the code smart
enough to ignore lingering dimensions in the context.
b) a) I don't understand your question "what dimension and dimension
is joined with". b) A Parent members children would be visible if a
selection was made on them within a dimension.
It sounds like the isExpanded flag needs to be extended now that
drilling has been introduced, I haven't looked at the PAT code so I'm
not sure I can be of much help there. You're UI will need to look
across the axis dimensions when determining what goes into the context
upon drilling. It almost sounds like you have another query model
within PAT that sits on top of olap4j.model?
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