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
dsQuery.setGrouping( toList( jointQuery.getGrouping( ) ) );
				return dsQuery.execute( eventHandler );
			}
			initialize( dataEngine, appContext );
			JointResultMetadata jrm = getJointResultMetadata( left.getResultMetaData( ),
					right.getResultMetaData( ) );
			resultClass = jrm.getResultClass( );
			populator = JointDataSetPopulatorFactory.getBinaryTreeDataSetPopulator( left.getOdiResult( ),
					right.getOdiResult( ),
					jrm,
					matcher,
					joinType );
			if ( doesSaveToCache( ) == false )
				return new CachedResultSet( (BaseQuery) this.odiQuery,
						resultClass,
						populator,
						eventHandler );
			else
				return new CachedResultSet( (BaseQuery) this.odiQuery,
						resultClass,
						new DataSetResultCache( populator, resultClass ),
						eventHandler );
		}
		/**
		 * @param obs
		 * @return
		 */
		private List toList( Object[] obs )
		{
			if ( obs == null )