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
while ( iter.hasNext( ) )
				{
					Object parameter = iter.next( );
					if ( parameter instanceof ScalarParameterHandle )
					{
						ParameterHelper.addParameterBinding( queryDefn,
								(ScalarParameterHandle) parameter );
					}
				}
		
				DataRequestSession dteSession = createDataSession( dataSet );
				return executeQuery( dteSession, queryDefn );
			}
			catch ( BirtException ex )
			{
				log.log( Level.WARNING, ex.getMessage( ), ex );
				executionContext.addException( ex );
			}
		}
		return  null;
	}
	
	private CascadingParameterGroupHandle getCascadingParameterGroup(
			String name )
	{
		ReportDesignHandle report = (ReportDesignHandle) runnable
				.getDesignHandle( );
		return report.findCascadingParameterGroup( name );
	}
	static class SelectionChoice implements IParameterSelectionChoice