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
{
			return Collections.EMPTY_LIST;
		}
		return this.getSelectionList( requestedParam.getName( ) );
	}
	public Collection getSelectionTreeForCascadingGroup(
			String parameterGroupName )
	{
		CascadingParameterGroupHandle parameterGroup = getCascadingParameterGroup( parameterGroupName );
		if ( parameterGroup == null )
			return Collections.EMPTY_LIST;
		SlotHandle parameters = parameterGroup.getParameters( );
		int parameterCount = parameters.getCount( );
		if ( DesignChoiceConstants.DATA_SET_MODE_SINGLE.equals( parameterGroup
				.getDataSetMode( ) ) )
		{
			
			IResultIterator resultIterator = getResultSetOfCascadingGroup( parameterGroup );
			if ( resultIterator == null )
			{
				return Collections.EMPTY_LIST;
			}
			Collection selectionTree = populateToSelectionTree( resultIterator,
					parameterGroup );
			close( resultIterator );
			return selectionTree;
		}
		else
		{
			ParameterHelper[] parameterHelpers = getParameterHelpers( parameterGroup );