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.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ModelDteApiAdapter.java
*/
	public IBaseDataSetDesign createDataSetDesign( DataSetHandle dataSet )
			throws BirtException
	{
		if ( dataSet instanceof OdaDataSetHandle )
			return newOdaDataSet( ( OdaDataSetHandle ) dataSet,
					context );
		if ( dataSet instanceof ScriptDataSetHandle )
			return newScriptDataSet( ( ScriptDataSetHandle ) dataSet,
					context );
		
		if ( dataSet instanceof JointDataSetHandle )
			return newJointDataSet( (JointDataSetHandle)dataSet, context);
		
		assert false;
		return null;
	}
	/**
	 * Create an IJointDataSetDesign instance.
	 * 
	 * @param handle
	 * @param context2
	 * @return
	 * @throws BirtException
	 */
	private IJointDataSetDesign newJointDataSet( JointDataSetHandle handle, ExecutionContext context2 ) throws BirtException
	{
		Iterator it = handle.joinConditionsIterator( );
		List joinConditions = new ArrayList();