function main(insight) {
    var grid = insight.grid;
    var rowLen = grid.mainTable.rows.length;
    var rowFieldSize = grid.rowFieldList.length;
    var columnFieldSize = grid.columnFieldList.length;
    var measureFieldSize = grid.measureFieldList.length;
    var headSize = columnFieldSize > 0 ? (measureFieldSize > 1 ? columnFieldSize + 1 : columnFieldSize) : 1;
    if (headSize < rowLen) {
        var cell = grid.mainTable.rows[headSize].cells[0];
        insight.grid.doFoldWholeField(cell);
    }
}