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
if ( obj == this )
			{
				return true;
			}
			if ( !(obj instanceof CascadingParameterSelectionChoice ) )
			{
				return false;
			}
			CascadingParameterSelectionChoice choice = (CascadingParameterSelectionChoice)obj;
			if ( value == null )
			{
				return choice.value == null;
			}
			return value.equals( choice.value );
		}
	}
	
	static class ChoiceListCache
	{
		private ParameterHelper[] parameterHelpers;
		private Map[] cachedLists;
		private Collection root;
		private int parameterCount;
		
		public ChoiceListCache( ParameterHelper[] parameterHelpers )
		{
			this.parameterHelpers = parameterHelpers;
			this.parameterCount = parameterHelpers.length;
			cachedLists = new Map[parameterCount - 1];
			for ( int i = 0; i < cachedLists.length; i++ )