Bug 181706 Sorting Data by X values doesn't work without grouping
Using the 2.2M5 designer , I simply want to sort the data of the X Series in a Line Chart. I go into the Sort and Group pop up in the chart wizard and select ascending, but it doesn't affect the result. (style ordered same as the result set) If i define a dummy grouping (no interval) it is then working.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/internal/datafeed/DataProcessor.java
{
	private final RunTimeContext rtc;
	private final IActionEvaluator iae;
	/**
	 * 
	 * To collect aggregation expressions and queries of each series. Note that
	 * some special cases, bubble/gantt series, are handled by hardcode.
	 * 
	 */
	class AggregationExpressionHelper
	{