Bug 151535 Parameters are invisable in Joint Dataset
Trying to use "Joint Dataset" combined with parameters within underlaying Data-Sets (neccessary to achive a filtering where clause for a DateTime Field) Parameter editing ( e.g. in Chart designer) do not show the entire parameter. As specified it should show and let to edit a combination of both underlaying datasets' parameters.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedJointDataSourceQuery.java
* @throws DataException
	 */
	PreparedJointDataSourceQuery( DataEngineImpl dataEngine,
			IQueryDefinition queryDefn, IBaseDataSetDesign dataSetDesign,
			Map appContext ) throws DataException
	{
		super( dataEngine, queryDefn, dataSetDesign, appContext );
		this.dataEngine = dataEngine;
		this.dataSetDesign = dataSetDesign;
		this.appContext = appContext;
	}
	/**
	 * Initialize the instance. The method includes heavyweight operations
	 * such as ResultIterator population.
	 * 
	 * @param dataEngine
	 * @param appContext
	 * @throws DataException
	 */
	private void initialize( DataEngineImpl dataEngine, Map appContext )
			throws DataException
	{
		int savedCacheOption = DataSetCacheManager.getInstance( )
				.suspendCache( );
		ResultIterator left = getSortedResultIterator( dataEngine,
				dataSet.getLeftDataSetDesignName( ),
				appContext,
				dataSet.getJoinConditions( ),
				true );
		ResultIterator right = getSortedResultIterator( dataEngine,