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
}
	}
	private void resetRowIdOfGroups( )
	{
		for ( int i = 0; i < rowIdOfGroups.length; i++ )
		{
			rowIdOfGroups[i] = rowId;
		}
	}
	public String getGroupId( int groupLevel )
	{
		return String.valueOf( groupLevel ) + "." + getRowId( groupLevel ); 
	}
	private String getRowId( int groupLevel )
	{
		assert rowIdOfGroups.length > 0;
		int level = groupLevel >= rowIdOfGroups.length
				? rowIdOfGroups.length - 1
				: groupLevel;
		level = groupLevel < 0 ? 0 : groupLevel;
		return String.valueOf( rowIdOfGroups[level] );
	}
	String baseRSetID;
	public void setBaseRSetID( String id )
	{
		baseRSetID = id;
	}
	public String getBaseRSetID( )
	{
		if ( baseRSetID == null && parent instanceof QueryResultSet )