Bug 137464 apply a filter on a Join dataset in chart editor's select data page, the data preview part is not refresh
Description: use the attach file.When apply a filter on a Join dataaset in chart editor's select data page, the data preview part is not refresh. Step to reproduce: 1. open the attach file 2. creat a chart and choose select data page 3. use the Jiondataset and set the X Y series 4. chilck a filter with row["Data Set1::EMPLOYEEID"] =1 Actual result: look at the data preview after you apply the filter,you will find it haven't change any more but the filter has effect Ecepted result: the data preview should refresh after set a filter
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedJointDataSourceQuery.java
{
	private static final String COLUMN_NAME_SPLITTER = "::";
	
	private IJointDataSetDesign dataSet;
	private IDataSetPopulator populator;
	private IResultClass resultClass;
	private ResultIterator left;
	private ResultIterator right;
	private IJoinConditionMatcher matcher;
	private int joinType;
	
	private DataEngineImpl dataEngine;
	private IBaseDataSetDesign dataSetDesign;
	private Map appContext;
	
	/**
	 * Constructor.
	 * 
	 * @param dataEngine
	 * @param queryDefn
	 * @param dataSetDesign
	 * @param appContext
	 * @throws DataException
	 */
	PreparedJointDataSourceQuery( DataEngineImpl dataEngine,
			IQueryDefinition queryDefn, IBaseDataSetDesign dataSetDesign,