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using Rules (C11), (C10), (C8), and (C5)), which is the algebraic form shown in Figure 8.
Thus, T(e, (), (), {()}) translates the term e into an algebraic form.
We prove that the algebraic form above is equivalent to the original comprehension.
Our unnesting algorithm generates the algebraic form in Figure 12.
Hence it does not make a difference whether this query is expressed as a group-by query or a nested query; both forms are optimized to the same efficient algebraic form.

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