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
IFilterDefinition src = (IFilterDefinition) it.next();
				IBaseExpression expr = src.getExpression();
				if ( isGroupFilter( src )) {
					ConditionalExpression ce = ((ConditionalExpression) expr);
					String exprText = ce.getExpression().getText();
					ColumnInfo columnInfo = QueryExecutorUtil
							.getColInfoFromJSExpr(cx, exprText);
					int index = columnInfo.getColumnIndex();
					String name = columnInfo.getColumnName();
					if (name == null && index < 0) {
						
						
						
						temporaryComputedColumns.add(new ComputedColumn(
								"_{$TEMP_FILTER_" + i + "$}_", exprText,
								DataType.ANY_TYPE));
						it.remove();
						result.add(new FilterDefinition(
								new ConditionalExpression(new ScriptExpression(
										String.valueOf("dataSetRow[\"_{$TEMP_FILTER_" + i
												+ "$}_\"]")), ce.getOperator(), ce
										.getOperand1(), ce.getOperand2())));
					}
				}
			}
		}
	}
	/**
	 * 
	 * @param filter