Bug 145478 Unable "Select Value" in the Join data set's filter
Step to reproduce: 1.new a join data set(please use the attached file) 2.right click the dataset and click the Edit 3.go to the Filter pane and set a filer 4.click the list of Value1 Actual result: A warning pop up and cant select Value.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
* @param dataSet
	 * @param queryDefn
	 * @param useColumnHints
	 * @return
	 * @throws BirtException
	 */
	public IQueryResults execute( DataSetHandle dataSet,
			QueryDefinition queryDefn, boolean useColumnHints,
			boolean useFilters ) throws BirtException
	{
		
		DataSessionContext context = new DataSessionContext( DataSessionContext.MODE_DIRECT_PRESENTATION,
				dataSet.getModuleHandle( ) );
		DataRequestSession session = DataRequestSession.newSession( context );
		IBaseDataSetDesign dataSetDesign = session.getModelAdaptor( )
				.adaptDataSet( dataSet );
		if ( !useColumnHints )
		{
			dataSetDesign.getResultSetHints( ).clear( );
		}
		if ( !useFilters )
		{
			dataSetDesign.getFilters( ).clear( );
		}
		IQueryResults resultSet = executeQuery( session, queryDefn );
		IResultMetaData metaData = resultSet.getResultMetaData( );
		
		int columnCount = 0;
		if ( metaData != null )
			columnCount = metaData.getColumnCount( );