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
catch ( IOException e )
		{
			throw new DataException( ResourceConstants.RD_SAVE_ERROR,
					e,
					"Group Information" );
		}
	}
	/**
	 * Everytime in CachedResultSet the result set cache changed, it must be
	 * reset to GroupCalculationUtil. Set the value of smartCache.
	 * 
	 * @param rsc
	 */
	public void setResultSetCache( ResultSetCache rsc )
	{
		this.smartCache = rsc;
	}
	/**
	 * Gets group count
	 * 
	 * @return number of groupKeys
	 */
	int getGroupCount( )
	{
		return groupDefs.length;
	}
	/**
	 * Sort the group array according to the values in sortKeys[] of
	 * GroupBoundaryInfo intances. within them.
	 *