Can you elaborate on what you mean by "nesting" setsums? It's an associative and commutative construction, so you can run e.g. map-reduce to map every parquet

Can you elaborate on what you mean by "nesting" setsums? It's an associative and commutative construction, so you can run e.g. map-reduce to map every parquet file to a setsum and then reduce to roll them up.