in components/js/selectionModel.ts [156:160]
private getColumnRangeByIndex(columnIndex: number): Slick.Range {
let rowCount = this._grid.getDataLength();
let lastRowToSelect = rowCount === 0 ? 0 : rowCount - 1 ;
return this._slickRangeFactory(0, columnIndex, lastRowToSelect, columnIndex);
}