this.iterator = new DataIterator( this, resultIterator, selectedColumns );
this.iterator = new DataIterator( this, resultIterator );
	public IDataIterator nextResultIterator( ) throws BirtException	{		if ( iterator == null )		{			if( null == resultIterator && null != queryResults )			{				resultIterator = queryResults.getResultIterator( );			}			this.iterator = new DataIterator( this, resultIterator, selectedColumns );		}		return iterator;	}