OLAP functionality includes the concept of a sliding *window* that moves
down
through the input rows as they are processed. Additional calculations can be

performed on the data in the window as it moves, allowing further analysis
in a
manner that is more efficient than using semantically equivalent self-join
queries, or correlated subqueries.

I am thinking this functionality is possible to implement working directly
with
the B-Tree.

Does anyone has better ideas?

Thanks,
Constantine
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