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
/*
	 * (non-Javadoc)
	 * @see org.eclipse.birt.report.data.adapter.api.DataRequestSession#getColumnValueSet(org.eclipse.birt.report.model.api.DataSetHandle, java.util.Iterator, java.util.Iterator, java.lang.String, int, int)
	 */
	public Collection getColumnValueSet( DataSetHandle dataSet,
			Iterator inputParamBindings, Iterator columnBindings,
			String boundColumnName, IRequestInfo requestInfo )
			throws BirtException
	{
		IQueryResults queryResults = getGroupingQueryResults( dataSet,
				inputParamBindings,
				columnBindings,
				boundColumnName );
		IResultIterator resultIt = queryResults.getResultIterator( );
		int maxRowCount = -1;
		if ( requestInfo != null )
		{
			resultIt.moveTo( requestInfo.getStartRow( ) );
			maxRowCount = requestInfo.getMaxRow( );
		}
		
		
		ArrayList values = new ArrayList( );
		while ( resultIt.next( ) && maxRowCount != 0 )
		{
			Object value = resultIt.getValue( boundColumnName );
			values.add( value );
			resultIt.skipToEnd( 1 );
			maxRowCount--;
		}