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
CascadingParameterGroupHandle parameterGroup = ( CascadingParameterGroupHandle ) handle;
		return parameterGroup;
	}
	private Collection getChoicesFromParameterQuery( ScalarParameterHandle parameter)
	{
		IResultIterator iter = getResultSetForParameter( parameter );
		if ( iter == null )
		{
			return Collections.EMPTY_LIST;
		}
		return populateToList( iter, parameter, null);
	}
	private IResultIterator getResultSetForParameter(
			ScalarParameterHandle parameter )
	{
		ReportDesignHandle report = (ReportDesignHandle) this.runnable
				.getDesignHandle( );
		DataSetHandle dataSet = report.findDataSet( parameter.getDataSetName( ) );
		IResultIterator iterator = null;
		if ( dataSet != null )
		{
			try
			{
				QueryDefinition queryDefn = createQueryDefinition( dataSet );
				ParameterHelper.addParameterBinding( queryDefn, parameter );
		
				DataRequestSession dteSession = createDataSession( dataSet );
				iterator = executeQuery( dteSession, queryDefn );
			}
			catch ( BirtException ex )