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
isLeftDataSet,
						preparedQuery );
			}
			IResultIterator ri = preparedQuery.execute( null )
					.getResultIterator( );
			assert ri instanceof ResultIterator;
			return (ResultIterator) ri;
		}
		catch ( BirtException e )
		{
			throw DataException.wrap(e);
		}
	}
	/**
	 * Add a sort expression to preparedQuery.
	 * 
	 * @param joinConditions
	 * @param isLeftDataSet
	 * @param preparedQuery
	 */
	private void addSortToPreparedQuery( IJoinCondition condition,
			boolean isLeftDataSet, IPreparedQuery preparedQuery )
	{
		IScriptExpression sortExpression;
		if ( isLeftDataSet )
		{
			sortExpression = condition.getLeftExpression( );
		}
		else
		{