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
int columnCount = 0;
		if ( metaData != null )
			columnCount = metaData.getColumnCount( );
		if ( dataSet.getPropertyHandle( DataSetHandle.RESULT_SET_PROP )
				.iterator( )
				.hasNext( ) )
		{
			for ( int n = 0; n < columnCount; n++ )
			{
				String columnLabel = metaData.getColumnLabel( n + 1 );
				String columnName = metaData.getColumnName( n + 1 );
				if ( !columnLabel.equals( columnName )
						&& columnName.lastIndexOf( RENAME_SEPARATOR ) >= 0
						&& !columnLabel.equals( columnName.substring( 0,
								columnName.lastIndexOf( RENAME_SEPARATOR ) ) ) )
				{
					dataSet.getPropertyHandle( DataSetHandle.RESULT_SET_PROP )
							.clearValue( );
					return execute( dataSet,
							useColumnHints,
							useFilters,
							rowsToReturn );
				}
			}
		}
		saveResultToDataItems( dataSet, resultSet );
		return resultSet;
	}
	/**
	 *