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
sortKeyColumns[groupCount + i] = keyName;
			sortAscending[groupCount + i] = query.getOrdering( )[i].isAscendingOrder( );
		}
		return new SortSpec( sortKeyIndexes, sortKeyColumns, sortAscending );
	}
}
/**
 * Structure to hold a group instance with its startIndex, endIndex, filter
 * result, sortKeys and Sort directions.
 * 
 */
final class GroupBoundaryInfo
{
	
	private int startIndex;
	private int endIndex;
	
	private Object[] sortKeys;
	private boolean[] sortDirections;
	
	private boolean accept = true;
	/**
	 * @param start
	 *            The start index of a group
	 * @param end
	 *            The end index of a group
	 */
	GroupBoundaryInfo( int start, int end )
	{
		this.startIndex = start;