Bug 147263 Data can't be retrieved for extended item
Steps to reproduce: 1.Add a table in library 2.New a report, extend lib.table 3.Add a filter on table, choose "select value" Expected result: Available value will be listed Actual result: Error: The expression's value can not be retrieved. The DataSetHandle shouldn't be null.
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/DataRequestSessionImpl.java
{
		assert dataSet != null;
		
		
		
		
		
		
		QueryDefinition query = new QueryDefinition( );
		query.setDataSetName( dataSet.getName( ) );
		GroupDefinition group = new GroupDefinition( );
		group.setKeyColumn( boundColumnName );
		query.addGroup( group );
		query.setUsesDetails( false );
		ModuleHandle moduleHandle = sessionContext.getModuleHandle( );
		if ( moduleHandle == null )
			moduleHandle = dataSet.getModuleHandle( );
		QueryExecutionHelper execHelper = new QueryExecutionHelper( this.dataEngine,
				this.modelAdaptor,
				moduleHandle );
		IQueryResults results = execHelper.executeQuery( query,
				inputParamBindings,
				null,
				columnBindings );
		return results;
	}
	
	/**
	 * Adapt all data sets and data sources defined in report design handle used
	 * to initialize this session