Bug 182680 Use feature of new Aggregation framework of Data Engine.
DataEngine will implement new aggregation framework in 2.2.0RC0. After the implementation is finished Engine should go ahead to use new column bindings in definition of map/highlight.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/GetParameterDefinitionTask.java
CascadingParameterGroupHandle parameterGroup = getCascadingGroup( parameter );
		SlotHandle parameters = parameterGroup.getParameters( );
		List values = new ArrayList( );
		for ( int i = 0; i < parameters.getCount( ); i++ )
		{
			ScalarParameterHandle tempParameter = ( ScalarParameterHandle ) parameters.get( i );
			if ( tempParameter == parameter )
			{
				break;
			}
			values.add( getParameterValue( tempParameter.getName( ) ) );
		}
		return values.toArray( );
	}
	private CascadingParameterGroupHandle getCascadingGroup( ScalarParameterHandle parameter )
	{
		DesignElementHandle handle = parameter.getContainer( );
		assert handle instanceof CascadingParameterGroupHandle;
		CascadingParameterGroupHandle parameterGroup = ( CascadingParameterGroupHandle ) handle;
		return parameterGroup;
	}
	private Collection getChoicesFromParameterQuery( ScalarParameterHandle parameter)
	{
		String dataType = parameter.getDataType( );
		boolean fixedOrder = parameter.isFixedOrder( );
		String dataSetName = parameter.getDataSetName( );
		String valueExpr = parameter.getValueExpr( );
		String labelExpr = parameter.getLabelExpr( );
		boolean isDistinct = parameter.distinct( );
		String sortDirection = parameter.getSortDirection( );