Bug 190769 [Regression]The attached report pop up exception when preview
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/QueryResultSet.java
public IBaseQueryResults getQueryResults( )
	{
		return queryResults;
	}
	public IResultIterator getResultIterator( )
	{
		return rs;
	}
	public long getRowIndex( )
	{
		return rowId;
	}
	public boolean next( ) throws BirtException
	{
		boolean flag;
		flag = rs == null ? false : rs.next( );
		if ( flag )
		{
			rowId++;
			updateRowIdOfGroups( );
		}
		return flag;
	}
	private void updateRowIdOfGroups( )
	{
		try
		{
			int startingGroup = rs.getStartingGroupLevel( );
			for ( int i = startingGroup; i < rowIdOfGroups.length; i++ )
			{