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/QueryExecutorUtil.java
groupIndex = groupKeyInfo.getColumnIndex( );
			groupKey = groupKeyInfo.getColumnName();
		}
		if ( groupKey == null && groupIndex < 0 )
		{*/
			ColumnInfo groupKeyInfo = new ColumnInfo(index, columnName );
			int groupIndex = groupKeyInfo.getColumnIndex( );
			String groupKey = groupKeyInfo.getColumnName();
			boolean isComplexExpression = true;
		
		
		IQuery.GroupSpec dest = new IQuery.GroupSpec( groupIndex, groupKey );
		dest.setName( src.getName() );
		dest.setInterval( src.getInterval());
		dest.setIntervalRange( src.getIntervalRange());
		dest.setIntervalStart( src.getIntervalStart());
		dest.setSortDirection( src.getSortDirection());
		dest.setFilters( src.getFilters());
		dest.setSorts( src.getSorts() );
		dest.setIsComplexExpression( isComplexExpression );
		return dest;
	}
	
	/**
	 * Convert IGroupDefn to IQuery.GroupSpec
	 * 
	 * @param cx
	 * @param src
	 * @return