new GroupInstanceFilter( this ).doGroupFiltering( cx, doGroupFiltering );
new GroupInstanceFilter( this ).doGroupFiltering( cx );
	public void doGroupFilteringAndSorting( ResultSetCache rsCache,			IExpressionProcessor exprProc, boolean doGroupFiltering )			throws DataException	{		this.populator.setCache( rsCache );		this.exprProcessor = exprProc;		exprProcessor.setResultIterator( this.populator.getResultIterator( ) );		Context cx = Context.enter( );		try		{			new GroupInstanceFilter( this ).doGroupFiltering( cx,					doGroupFiltering );			new GroupInstanceSorter( this ).doGroupSorting( cx );		}		finally		{			Context.exit( );		}	}