Help:Limiting ancestors of a dimension leaf member:10g :OLAPDML

Question

We have a dimension Operating unit which has a standard parent child hierarchy.
At run time we want to restrict the list of members visible to each user based on a security table. For leaf members we want to show the leaf member and the immediate parent. For members at any other level we want to show the member only.
So e.g operating unit 6000 is a leaf member with parent 6100.
In this case we want user to see 6000 and 6100.
If operating unit is 6100 (not a leaf member) we want user to see 6100 only.
Question is how do we 1) detect a leaf member and 2) find its immediate parent using ? via OLAPDML using the relationship CR_OU_PARENTREL or any other alternative method.
[ We will be invoking this program via ONATTACH].
Thanks,
Sudip

Answer 1

Suppose that your dimension is named op_unit and that the parent relation is op_unit_parentrel.
I will assume that you have limited the the op_unit dimension to the initial list of members and that you have limited the hierarchy dimension (op_unit_hierlist) to a single member. The following limit statement will add the parents of all leaf members in status.
limit op_unit add limit(limit(op_unit keep bottomdescendants using op_unit_parentrel) to parents using op_unit_parentrel)
Here is an example
rpr op_unit_parentrel
OP_UNIT      RENTREL
6000     6100
6100     6200
6200     NA
5900     6100
First show that parent members are added for leaves
limit op_unit to '6000'
limit op_unit add limit(limit(op_unit keep bottomdescendants using op_unit_parentrel) to parents using op_unit_parentrel)
rpr op_unit
OP_UNIT
6000
6100
Now show that parent members are not added for non-leaf members
limit op_unit to '6100'
limit op_unit add limit(limit(op_unit keep bottomdescendants using op_unit_parentrel) to parents using op_unit_parentrel)
rpr op_unit
OP_UNIT
6100