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
DataSetCacheManager.getInstance( ).setCacheOption( savedCacheOption );
		this.left = left;
		this.right = right;
		this.joinType = dataSet.getJoinType( );
		this.matcher = new JoinConditionMatcher( left.getOdiResult( ),
				right.getOdiResult( ),
				left.getScope( ),
				right.getScope( ),
				dataSet.getJoinConditions( ) );
		JointResultMetadata meta = getJointResultMetadata( left, right );
		resultClass = meta.getResultClass( );
	}
	/**
	 * @param dataSetDesign
	 */
	private void setCurrentDataSet( IBaseDataSetDesign dataSetDesign )
	{
		dataSet = (IJointDataSetDesign) dataSetDesign;
	}
	
	/**
	 * Return an instance of JointResultMeta.
	 * 
	 * @param left
	 * @param right
	 * @return
	 * @throws DataException
	 */
	private JointResultMetadata getJointResultMetadata( ResultIterator left,