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In its internal data structure, Calc until version 4.1 relies on cells as the base class throughout, which has been blamed for "extreme memory use, slow computation, and difficult code". Version 4.2 (released in January 2014) addresses these issues by instead storing the data in arrays where possible. [16] Pivot Table [ edit ] Originally called DataPilot, [3] Pivot Table provides similar functionality to the Pivot table found in Microsoft Excel .