Oracle Error Message
ORA-36260: (XSAGHIERPART00) Aggregating from partition %J to partition %J over hierarchy workspace object creates an increase in sparsity.
Reason for the Error
In the partition creation / aggmap creation a situation developed such that when aggregating over a particular dimension of the aggmap a partition boundary was crossed such that the sparsity of the target partition included dimensions that were not in the sparsity of the source partition. Since the process of aggregation always densifies rather than sparsifying this is an extremely suboptimal design and it is not supported by the aggregate system.
Solution
Set up your partitioning such that for any partition boundary the source and target partitions of the aggregation will always move towards denser partitions. For any child (c) and any parent (p) where (c) and (p) are in different partitions it must be the case that the parent partition contains no dimension in the composite that the child partition does not contain in its composite.
