$stdDev accumulator can return imprecise results when spilling to disk

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      When merging intermediate results which have spilled to disk, the $stdDev accumulator executes the variance calculation involving some arithmetic over the previously calculated mean and . If the mean is a precise double, then this could result in precision loss.

              Assignee:
              [DO NOT USE] Backlog - Query Execution
              Reporter:
              Nicholas Zolnierz
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