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
private CascadingParameterGroupHandle getCascadingParameterGroup(
			String name )
	{
		ReportDesignHandle report = (ReportDesignHandle) runnable
				.getDesignHandle( );
		return report.findCascadingParameterGroup( name );
	}
	static class SelectionChoice implements IParameterSelectionChoice
	{
		String label;
		Object value;
		SelectionChoice( String label, Object value )
		{
			this.label = label;
			this.value = value;
		}
		public String getLabel( )
		{
			return this.label;
		}
		public Object getValue( )
		{
			return this.value;
		}
	}
	
	public void close( )
	{
		if ( dataCache != null )
		{