Bug 182895 Support sort on Level attribute.
Currently in OLAP engine we only support sort on level key value. We should go ahead to support sort on level attribute value.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/query/view/QueryExecutor.java
* @param calMember
	 * @param index
	 * @return
	 */
	private List getCalculatedMemberWithSameRSId( CalculatedMember[] calMember,
			int index )
	{
		CalculatedMember member = calMember[index];
		List list = new ArrayList( );
		list.add( member );
		for ( int i = index + 1; i < calMember.length; i++ )
		{
			if ( calMember[i].getRsID( ) == member.getRsID( ) )
				list.add( calMember[i] );
		}
		return list;
	}
	/**
	 * 
	 * @param calMember
	 * @return
	 */
	private int getDistinctCalculatedMemberCount( CalculatedMember[] calMember )
	{
		Set rsIDSet = new HashSet( );
		for ( int i = 0; i < calMember.length; i++ )
		{
			if ( rsIDSet.contains( new Integer( calMember[i].getRsID( ) ) ) )
				continue;
			rsIDSet.add( new Integer( calMember[i].getRsID( ) ) );