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grid.setRowGroup({
    footerCellMerge: true
});

gridView.setFooter({
    mergeCells: [
            ["QuantityPerUnit", "Country", "CompanyName", "OrderID"],
            ["UnitPrice", "CustomerID"]
        ]
});

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  gridView.setRowGroup({ footerCellMerge: true });  

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  gridView.setFooter({
            mergeCells:
                [
                    ["QuantityPerUnit", "Country", "CompanyName", "OrderID"],
                    ["UnitPrice", "CustomerID"]
                ]
        });