GapiSheetsV4Model.GridDataSourcetype t = {startRow : int;The first row this GridData refers to, zero-based.
*)startColumn : int;The first column this GridData refers to, zero-based.
*)rowData : RowData.t list;The data in the grid, one entry per row, starting with the row in startRow. The values in RowData will correspond to columns starting at start_column.
*)rowMetadata : DimensionProperties.t list;Metadata about the requested rows in the grid, starting with the row in start_row.
*)columnMetadata : DimensionProperties.t list;Metadata about the requested columns in the grid, starting with the column in start_column.
*)}