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/executor/transform/group/GroupCalculationUtil.java
{
			this.groupInformationUtil.readGroupsFromStream( inputStream );
		}
		catch ( IOException e )
		{
			throw new DataException( ResourceConstants.RD_LOAD_ERROR,
					e,
					"Group Info" );
		}
		this.rsMeta = rsMeta;
		this.smartCache = rsCache;
	}
	/**
	 * 
	 * @return
	 */
	public GroupInformationUtil getGroupInformationUtil( )
	{
		return this.groupInformationUtil;
	}
	/**
	 * @param inputStream
	 * @throws DataException 
	 */
	public void doSave( OutputStream outputStream ) throws DataException
	{
		try
		{
			this.groupInformationUtil.saveGroupsToStream( outputStream );
		}