if ( dataSetHandle instanceof ScriptDataSetHandle == false ) dataSetHandle.getPropertyHandle( DataSetHandle.RESULT_SET_PROP ) .clearValue( );
	IResultMetaData refreshMetaData( DataSetHandle dataSetHandle )			throws BirtException	{		IResultMetaData rsMeta = null;		BirtException e = null;		try		{			rsMeta = this.getDataSetMetaData( dataSetHandle, false );		}		catch ( BirtException e1 )		{			e = e1;		}		if ( needsSetCachedMetaData( dataSetHandle, rsMeta ) )		{			dataSetHandle.setCachedMetaData( StructureFactory.createCachedMetaData( ) );			if ( rsMeta != null && rsMeta.getColumnCount( ) != 0 )			{				for ( int i = 1; i <= rsMeta.getColumnCount( ); i++ )				{					ResultSetColumn rsc = StructureFactory.createResultSetColumn( );					rsc.setColumnName( getColumnName( rsMeta, i ) );					rsc.setDataType( toModelDataType( rsMeta.getColumnType( i ) ) );					rsc.setPosition( new Integer( i ) );					dataSetHandle.getCachedMetaDataHandle( )							.getResultSet( )							.addItem( rsc );				}			}		}		if ( e != null )			throw e;		return rsMeta;	}