Bug 208412 Enhance Chart Engine to process grouped, uni-dimensional Data
chart/org.eclipse.birt.chart.reportitem/src/org/eclipse/birt/chart/reportitem/ChartReportItemPresentationBase.java
protected IDataRowExpressionEvaluator createEvaluator( IBaseResultSet set )
	{
		if ( set instanceof IQueryResultSet )
		{
			
			
			
			
			if ( ChartReportItemUtil.containsGrouping( cm ) )
			{
				return new BIRTGroupedDataRowExpressionEvaluator( (IQueryResultSet) set );
			}
			return new BIRTQueryResultSetEvaluator( (IQueryResultSet) set );
		}
		
		
		
		
		return null;
	}
	protected ScaleContext createSharedScale( IBaseResultSet baseResultSet )
			throws BirtException
	{
		Object min = baseResultSet.evaluate( "row._outer[\"" 
				+ ChartReportItemUtil.QUERY_MIN + "\"]" ); 
		Object max = baseResultSet.evaluate( "row._outer[\"" 
				+ ChartReportItemUtil.QUERY_MAX + "\"]" ); 
		return ScaleContext.createSimpleScale( min, max );
	}
	/*