Bug: Grouped cumulative sum produces incorrect results

To see the issue in the sample dataset, go to the orders table and select cumulative sum of subtotal, grouped by Created At: Month and Product Category. If you look at the table, you’ll see that the cumulative sum is not being performed by group – it is being performed element-wise across groups.

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Very old bug: https://github.com/metabase/metabase/issues/2862