Answer / guest

Cause: In the partition creation / aggmap creation a
situation developed such that when aggregating over a
particular dimension of the aggmap a partition boundery was
crossed such that the sparsity of the target partition
included dimensions that were not in the sparisty 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.

Action: 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 it's composite.

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