Bug 209450 [regression]Duplicate values display in Cascading parameter list[0705]
Descripption: Duplicate values display in Cascading parameter list Build number:2.3.0.v20071112 Steps to reproduce: 1. New sample data source and dataset from CUSTOMERS. 2. New a cascading parameter from COUNTRY, STATE AND CITY fields. 3. Preview. Expected result: Values in three parameter list aren't duplicated. Actual result: Duplicate values show in parameter list. Error log:n/a
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/GetParameterDefinitionTask.java
sortByLabel, parameter.getPattern( ),
						sortDirectionValue, ULocale.forLocale( locale ) ) );
			return choices;
		}
		return Collections.EMPTY_LIST;
	}
	private Collection getCascadingParameterList( ScalarParameterHandle parameter )
	{
		Object[] parameterValuesAhead =  getParameterValuesAhead( parameter );
		return getChoicesFromParameterGroup ( parameter, parameterValuesAhead );
	}
	private Collection populateToList( IResultIterator iterator,
			ScalarParameterHandle parameter, SelectionFilter filter )
	{
		ParameterHelper parameterHelper = new ParameterHelper( parameter, locale );
		Collection choices = parameterHelper.createSelectionCollection( );
		int limit = parameter.getListlimit( );
		try
		{
			while ( iterator.next( )
					&& ( limit <= 0 || choices.size( ) < limit ) )
			{
				
				if ( filter != null && !filter.accept( iterator ) )
				{
					continue;
				}
				String label = parameterHelper.getLabel( iterator );
				Object value = parameterHelper.getValue( iterator );
				choices.add( new SelectionChoice( label, value ) );