Bug 132805 Set descending to outer group will affect inner group.
Description: Set descending to outer group will affect inner group. Steps to reproduce: 1. New a sample datasource and dataset from orders. 2. Drag the dataset to Layout. 3. Add a group on ordernumber, interval 10, descending. 4. Add another group on orderdate, interval day 2, ascending. 5. Preview. Expected result: Data are grouped correctly. Actual result: Inner group didn't work unless you set outer group's sort to asc.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
String expr = src.getKeyColumn();
					if( expr == null )
					{
						expr = src.getKeyExpression();
					}else
					{
						expr = getColumnRefExpression(expr);
					}
					String groupName = "";
					if( expr.trim().equalsIgnoreCase("row[0]")
						|| expr.trim().equalsIgnoreCase("row._rowPosition")
						|| expr.trim().equalsIgnoreCase("dataSetRow[0]")
						|| expr.trim().equalsIgnoreCase("dataSetRow._rowPosition"))
					{
						groupName = "_{$TEMP_GROUP_" + i + "ROWID$}_";
					}else
					{
						groupName = "_{$TEMP_GROUP_" + i + "$}_";
					}
					IQuery.GroupSpec dest = QueryExecutorUtil.groupDefnToSpec( cx,
							src,
							groupName,
							-1 );
					groupSpecs[i] = dest;
					
					temporaryComputedColumns.add( new ComputedColumn( groupName,
						expr,
						QueryExecutorUtil.getTempComputedColumnType( groupSpecs[i].getInterval( ) ) ) );
				}