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
* @param groupArray
	 */
	void sortGroupBoundaryInfos( ArrayList[] groupArray )
	{
		for ( int i = 0; i < groupArray.length; i++ )
		{
			Object[] toBeSorted = new Object[groupArray[i].size( )];
			for ( int j = 0; j < toBeSorted.length; j++ )
			{
				toBeSorted[j] = groupArray[i].get( j );
			}
			Arrays.sort( toBeSorted, new GroupBoundaryInfoComparator( ) );
			groupArray[i].clear( );
			for ( int j = 0; j < toBeSorted.length; j++ )
			{
				groupArray[i].add( toBeSorted[j] );
			}
		}
	}
	public BaseQuery getQuery( )
	{
		return this.query;
	}
	/**
	 * This method is used to filter out the GroupBoundaryInfo instances that
	 * are marked as "not accepted" from GroupBoundaryInfos.
	 * 
	 * @param groupArray
	 * @return
	 */